Topic-First Index¶

Find content by topic regardless of domain. Search for what you need.

Linux¶

/proc Filesystem (procfs, proc, proc-pid, proc-meminfo)¶

Asset	Type	Level
/proc Filesystem	Topic Pack	L2

Bash / Shell Scripting (bash, shell, scripting, shell-scripting) → full page¶

Asset	Type	Level
Bash Exercises (Quest Ladder) (CLI)	Exercise Set	L0
Linux Ops	Topic Pack	L0
Linux Ops Drills	Drill	L0
Skillcheck: Bash	Assessment	L0
Track: Foundations	Reference	L0
Advanced Bash for Ops	Topic Pack	L1
Bash Flashcards	flashcard_deck	L1
Cron & Job Scheduling	Topic Pack	L1
Environment Variables	Topic Pack	L1
Linux Text Processing	Topic Pack	L1
Make & Build Systems	Topic Pack	L1
Pipes & Redirection	Topic Pack	L1
Process Management	Topic Pack	L1
Regex & Text Wrangling	Topic Pack	L1
Terminal Internals	Topic Pack	L1
awk: The Record/Field Processor	Topic Pack	L1
find	Topic Pack	L1
grep & Regular Expressions	Topic Pack	L1
sed: The Stream Editor	Topic Pack	L1
xargs	Topic Pack	L1
Fleet Operations at Scale	Topic Pack	L2
LPIC / LFCS Exam Preparation	Topic Pack	L2
RHCE (EX294) Exam Preparation	Topic Pack	L2

Binary & Number Representation (binary, integers, floats, bitwise)¶

Asset	Type	Level
Binary Flashcards	flashcard_deck	L1
Binary and Floats	Topic Pack	L1

Cron & Job Scheduling (crontab, systemd-timers, cronjob, at)¶

Asset	Type	Level
Cron & Job Scheduling	Topic Pack	L1
Cron Flashcards	flashcard_deck	L1

DNF Package Manager (dnf5, yum4, dnf-automatic, versionlock)¶

Asset	Type	Level
DNF Flashcards	flashcard_deck	L1
DNF Package Manager	Topic Pack	L2

Debian & Ubuntu Ecosystem (debian, ubuntu, apt, dpkg) → full page¶

Asset	Type	Level
Debian & Ubuntu Ecosystem	Topic Pack	L1
Debian Ubuntu Flashcards	flashcard_deck	L1
Linux Distribution Comparison	Topic Pack	L1

Disk & Storage Ops (fdisk, parted, lvm, mdadm)¶

Asset	Type	Level
Disk & Storage Ops	Topic Pack	L1

Environment Variables (env, env-vars, PATH, export)¶

Asset	Type	Level
Environment Variables	Topic Pack	L1

Filesystems & Storage (ext4, xfs, btrfs, file-systems) → full page¶

Asset	Type	Level
Case Study: Disk Full Root Services Down	Case Study	L1
Case Study: Runaway Logs Fill Disk	Case Study	L1
Disk & Storage Ops	Topic Pack	L1
Inodes	Topic Pack	L1
Inodes Flashcards	flashcard_deck	L1
Linux Filesystem Flashcards	flashcard_deck	L1
Runbook: Disk Full	Runbook	L1
Case Study: NVMe Drive Disappeared	Case Study	L2
Case Study: Stuck NFS Mount	Case Study	L2
Deep Dive: Linux Filesystem Internals	Deep Dive	L2
Deep Dive: Linux Performance Debugging	Deep Dive	L2
Runbook: PostgreSQL Disk Space Critical	Runbook	L2
Storage Operations	Topic Pack	L2
Kernel Troubleshooting	Topic Pack	L3

Kernel Troubleshooting (dmesg, kernel-panic, crash-dump, kdump)¶

Asset	Type	Level
Kernel Troubleshooting	Topic Pack	L3

LPIC / LFCS Exam (lpic, lfcs, lpic-1, lpic-2)¶

Asset	Type	Level
LPIC/LFCS Flashcards	flashcard_deck	L1
LPIC / LFCS Exam Preparation	Topic Pack	L2

Linux Boot Process (boot, grub, initramfs, uefi)¶

Asset	Type	Level
Linux Boot Process	Topic Pack	L1

Linux Data Hoarding (data-hoarding, snapraid, jbod, par2)¶

Asset	Type	Level
Linux Data Hoarding Flashcards	flashcard_deck	L1
Linux Data Hoarding	Topic Pack	L2

Linux Distribution Comparison (distro, distros, linux-distributions, rhel-vs-ubuntu)¶

Asset	Type	Level
Linux Distribution Comparison	Topic Pack	L1
Linux Distros Flashcards	flashcard_deck	L1

Linux Fundamentals (linux, linux-basics, filesystem, permissions) → full page¶

Asset	Type	Level
Bash Exercises (Quest Ladder) (CLI)	Exercise Set	L0
Linux Ops	Topic Pack	L0
Linux Ops Drills	Drill	L0
Mental Models (Core Concepts)	Topic Pack	L0
Skillcheck: Linux Fundamentals	Assessment	L0
Track: Foundations	Reference	L0
Advanced Bash for Ops	Topic Pack	L1
Case Study: Disk Full Root Services Down	Case Study	L1
Case Study: Inode Exhaustion	Case Study	L1
Case Study: Runaway Logs Fill Disk	Case Study	L1
Case Study: SELinux Denying Service	Case Study	L1
Case Study: Zombie Processes Accumulating	Case Study	L1
Debian & Ubuntu Ecosystem	Topic Pack	L1
Disk & Storage Ops	Topic Pack	L1
Environment Variables	Topic Pack	L1
Interview: Linux Server Slow	Scenario	L1
Linux Boot Process	Topic Pack	L1
Linux Distribution Comparison	Topic Pack	L1
Linux Fundamentals Flashcards	flashcard_deck	L1
Linux Logging	Topic Pack	L1
Linux Memory Management	Topic Pack	L1
Linux Signals & Process Control	Topic Pack	L1
Linux Users & Permissions	Topic Pack	L1
Ops Archaeology: The Container That Exits Immediately	Case Study	L1
Ops Archaeology: The Gateway That Returns 502	Case Study	L1
Ops Archaeology: The Service That Won't Start	Case Study	L1
Pipes & Redirection	Topic Pack	L1
Process Management	Topic Pack	L1
Regex & Text Wrangling	Topic Pack	L1
SSH Deep Dive	Topic Pack	L1
curl & wget	Topic Pack	L1
iptables & nftables	Topic Pack	L1
rsync	Topic Pack	L1
systemctl & journalctl Deep Dive	Topic Pack	L1
tar & Compression	Topic Pack	L1
tmux & screen	Topic Pack	L1
/proc Filesystem	Topic Pack	L2
Adversarial Interview Gauntlet (30 sequences)	Scenario	L2
Case Study: CI Pipeline Fails — Docker Layer Cache Corruption	Case Study	L2
Case Study: Container Vuln Scanner False Positive Blocks Deploy	Case Study	L2
Case Study: Disk Full — Runaway Logs, Fix Is Loki Retention	Case Study	L2
Case Study: HPA Flapping — Metrics Server Clock Skew, Fix Is NTP	Case Study	L2
Case Study: Job Queue Backlog — Worker Pod CPU Throttled by cgroup	Case Study	L2
Case Study: Kernel Soft Lockup	Case Study	L2
Case Study: OOM Killer Events	Case Study	L2
Case Study: Terraform Apply Fails — State Lock Stuck, DynamoDB Throttle	Case Study	L2
Case Study: Time Sync Skew Breaks App	Case Study	L2
Deep Dive: Linux Boot Sequence	Deep Dive	L2
Deep Dive: Linux Filesystem Internals	Deep Dive	L2
Deep Dive: Linux Memory Management	Deep Dive	L2
Deep Dive: Linux Performance Debugging	Deep Dive	L2
Deep Dive: Systemd Architecture	Deep Dive	L2
Deep Dive: Systemd Timers Journald Cgroups and Resource Control	Deep Dive	L2
Edge & IoT Infrastructure	Topic Pack	L2
LPIC / LFCS Exam Preparation	Topic Pack	L2
Linux Performance Tuning	Topic Pack	L2
Ops Archaeology: The Job That Succeeded Wrong	Case Study	L2
Ops Archaeology: The Replica That Fell Behind	Case Study	L2
Ops Archaeology: The Slow Death Nobody Noticed	Case Study	L2
RHCE (EX294) Exam Preparation	Topic Pack	L2
SELinux & AppArmor	Topic Pack	L2
Virtualization	Topic Pack	L2
cgroups & Linux Namespaces	Topic Pack	L2
Deep Dive: Linux Process Scheduler	Deep Dive	L3
Kernel Troubleshooting	Topic Pack	L3
eBPF & Modern Linux Observability	Topic Pack	L3

Linux Hardening (os-hardening, cis-benchmark, system-hardening) → full page¶

Asset	Type	Level
Linux Security Flashcards	flashcard_deck	L1
Linux Users & Permissions	Topic Pack	L1
SSH Deep Dive	Topic Pack	L1
Compliance & Audit Automation	Topic Pack	L2
Deep Dive: Systemd Service Design Debugging and Hardening	Deep Dive	L2
Infrastructure Forensics	Topic Pack	L2
LDAP & Identity Management	Topic Pack	L2
SELinux & AppArmor	Topic Pack	L2
SELinux & Linux Hardening	Topic Pack	L2

Linux Kernel Tuning (sysctl, kernel-tuning, tcp-tuning, ulimit)¶

Asset	Type	Level
Linux Kernel Flashcards	flashcard_deck	L1
Linux Kernel Tuning	Topic Pack	L2

Linux Logging (syslog, rsyslog, journald, journalctl)¶

Asset	Type	Level
Linux Logging	Topic Pack	L1

Linux Memory Management (memory, oom-killer, swap, vmstat) → full page¶

Asset	Type	Level
Linux Memory Flashcards	flashcard_deck	L1
Linux Memory Management	Topic Pack	L1
Runbook: OOM Killer Activated	Runbook	L1

Linux Ops Performance Triage (perf-triage, linux-perf-triage, ops-triage)¶

Asset	Type	Level
Linux Performance Tuning	Topic Pack	L2

Linux Ops Storage (linux-storage-ops, disk-ops, storage-triage)¶

Asset	Type	Level
Linux Ops Storage	Topic Pack	L1

Linux Ops systemd (systemd-ops, systemd-triage, service-management)¶

Asset	Type	Level
Linux Ops Systemd	Topic Pack	L1

Linux Performance Tuning (perf, flamegraph, sysctl, strace) → full page¶

Asset	Type	Level
Linux Memory Management	Topic Pack	L1
Linux Performance Flashcards	flashcard_deck	L1
Runbook: High CPU (Runaway Process)	Runbook	L1
/proc Filesystem	Topic Pack	L2
Linux Kernel Tuning	Topic Pack	L2
Linux Performance Tuning	Topic Pack	L2

Linux Signals & Process Control (signals, sigterm, sigkill, kill)¶

Asset	Type	Level
Linux Signals & Process Control	Topic Pack	L1
Runbook: Zombie Processes Accumulating	Runbook	L2

Linux Text Processing (sort, uniq, cut, tr)¶

Asset	Type	Level
Linux Text Processing	Topic Pack	L1

Linux Users & Permissions (chmod, chown, acl, sudo)¶

Asset	Type	Level
Linux Users & Permissions	Topic Pack	L1

Mounts & Filesystems (alias) (mount-ops, filesystem-ops, fstab-ops)¶

Asset	Type	Level
Mounts Filesystems	Topic Pack	L1

Package Management (apt, yum, rpm, dpkg) → full page¶

Asset	Type	Level
Linux Ops	Topic Pack	L0
Skillcheck: Linux Fundamentals	Assessment	L0
Debian & Ubuntu Ecosystem	Topic Pack	L1
Package Management	Topic Pack	L1
Package Management Flashcards	flashcard_deck	L1

Pipes & Redirection (pipes, redirection, stdin, stdout)¶

Asset	Type	Level
Pipes & Redirection	Topic Pack	L1

Process Management (signals, zombie, orphan, nohup) → full page¶

Asset	Type	Level
Linux Processes Flashcards	flashcard_deck	L1
Process Management	Topic Pack	L1
Runbook: High CPU (Runaway Process)	Runbook	L1
Runbook: Zombie Processes Accumulating	Runbook	L2

SSH Deep Dive (ssh, sshd, ssh-keygen, ssh-agent)¶

Asset	Type	Level
SSH Deep Dive	Topic Pack	L1
SSH Hygiene Flashcards	flashcard_deck	L1

Terminal Internals (terminal, tty, pty, shell)¶

Asset	Type	Level
Terminal Flashcards	flashcard_deck	L1
Terminal Internals	Topic Pack	L1

cgroups & Linux Namespaces (cgroups, namespaces, cgroup-v2, unshare)¶

Asset	Type	Level
cgroups & Linux Namespaces	Topic Pack	L2

eBPF (bpftrace, bcc-tools, kernel-tracing, tcplife) → full page¶

Asset	Type	Level
eBPF Flashcards	flashcard_deck	L1
Cilium & eBPF Networking	Topic Pack	L2
Linux Performance Tuning	Topic Pack	L2
Deep Dive: eBPF Explained	Deep Dive	L3
eBPF & Modern Linux Observability	Topic Pack	L3

iptables & nftables (iptables, nftables, firewall, netfilter)¶

Asset	Type	Level
iptables & nftables	Topic Pack	L1
Case Study: Ansible Playbook Hangs — SSH Agent Forwarding Blocked by Firewall	Case Study	L2

perf Profiling (perf, profiling, performance, tracing)¶

Asset	Type	Level
Performance Flashcards	flashcard_deck	L1
perf Profiling	Topic Pack	L2

rsync (rsync, file-sync, delta-transfer, backup)¶

Asset	Type	Level
rsync	Topic Pack	L1

strace (strace, syscalls, tracing)¶

Asset	Type	Level
Strace Flashcards	flashcard_deck	L1
strace	Topic Pack	L1

systemctl & journalctl Deep Dive (systemctl, journalctl, unit-files, timer-units)¶

Asset	Type	Level
systemctl & journalctl Deep Dive	Topic Pack	L1

systemd (systemctl, journalctl, services, units) → full page¶

Asset	Type	Level
Linux Ops	Topic Pack	L0
Skillcheck: Linux Fundamentals	Assessment	L0
Case Study: Systemd Service Flapping	Case Study	L1
Cron & Job Scheduling	Topic Pack	L1
Linux Boot Process	Topic Pack	L1
Linux Logging	Topic Pack	L1
Linux Systemd Flashcards	flashcard_deck	L1
Ops Archaeology: The Service That Won't Start	Case Study	L1
Runbook: Systemd Service Crash Loop	Runbook	L1
systemctl & journalctl Deep Dive	Topic Pack	L1
Deep Dive: Linux Boot Sequence	Deep Dive	L2
Deep Dive: Systemd Architecture	Deep Dive	L2
Deep Dive: Systemd Service Design Debugging and Hardening	Deep Dive	L2
Deep Dive: Systemd Timers Journald Cgroups and Resource Control	Deep Dive	L2
Deep Dive: Systemd Units Dependencies and Ordering	Deep Dive	L2
LPIC / LFCS Exam Preparation	Topic Pack	L2
RHCE (EX294) Exam Preparation	Topic Pack	L2

tar & Compression (tar, gzip, bzip2, xz)¶

Asset	Type	Level
tar & Compression	Topic Pack	L1

tmux & screen (tmux, screen, terminal-multiplexer, detach)¶

Asset	Type	Level
tmux & screen	Topic Pack	L1

Networking¶

ARP (arp-table, mac-address, neighbor-discovery) → full page¶

Asset	Type	Level
ARP	Topic Pack	L1
ARP Flashcards	flashcard_deck	L1
Case Study: ARP Flux Duplicate IP	Case Study	L2
Case Study: Proxy ARP Causing Issues	Case Study	L2

BGP EVPN / VXLAN (evpn, vxlan, vtep, vni)¶

Asset	Type	Level
BGP EVPN / VXLAN	Topic Pack	L2
Case Study: API Latency Spike — BGP Route Leak, Fix Is Network ACL	Case Study	L2

Cisco CLI (ios, show-commands, cisco-basics, cisco-fundamentals-for-devops) → full page¶

Asset	Type	Level
Cisco Flashcards	flashcard_deck	L1
Cisco Fundamentals for DevOps	Topic Pack	L1
Networking Deep Dive	Topic Pack	L1
Scenario: VLAN Trunk Mismatch	Scenario	L2

DHCP & IP Address Management (dhcp, ipam, dhcp-relay, lease)¶

Asset	Type	Level
DHCP & IP Address Management	Topic Pack	L1
DHCP Flashcards	flashcard_deck	L1

DNS (domain-name-system, coredns, dig, nslookup) → full page¶

Asset	Type	Level
Case Study: DNS Resolution Slow	Case Study	L1
DHCP & IP Address Management	Topic Pack	L1
DNS Deep Dive	Topic Pack	L1
DNS Flashcards	flashcard_deck	L1
Networking Deep Dive	Topic Pack	L1
Networking Drills	Drill	L1
Runbook: DNS Resolution Failure	Runbook	L1
Skillcheck: Networking Fundamentals	Assessment	L1
AWS Route 53	Topic Pack	L2
Case Study: CoreDNS Timeout Pod DNS	Case Study	L2
Case Study: DNS Looks Broken — TLS Expired, Fix Is Cert-Manager	Case Study	L2
Case Study: DNS Split Horizon Confusion	Case Study	L2
DNS Operations	Topic Pack	L2
Incident Simulator (18 scenarios) (CLI)	Exercise Set	L2
Ops Archaeology: The 5% That Can't Resolve	Case Study	L2
Scenario: DNS Looks Fine but App Fails	Scenario	L2

DNS Deep Dive (dns-internals, dig, zone-files, dns-resolution)¶

Asset	Type	Level
DNS Deep Dive	Topic Pack	L1

DNSSEC & DNS Security (dnssec, dns-security, doh, dot)¶

Asset	Type	Level
Dnssec Flashcards	flashcard_deck	L1
DNSSEC & DNS Security	Topic Pack	L2

Email Infrastructure (spf, dkim, dmarc, smtp)¶

Asset	Type	Level
Email Infrastructure	Topic Pack	L1

Firewalls (firewall, iptables, nftables, ufw) → full page¶

Asset	Type	Level
Firewalls	Topic Pack	L1
Firewalls Flashcards	flashcard_deck	L1
Case Study: Firewall Shadow Rule	Case Study	L2
Case Study: IPTables Blocking Unexpected	Case Study	L2
VPN & Tunneling	Topic Pack	L2

HTTP Protocol (http, https, web, apis) → full page¶

Asset	Type	Level
HTTP Protocol	Topic Pack	L0
HTTP Protocol Flashcards	flashcard_deck	L1
gRPC & Protocol Buffers	Topic Pack	L2

LACP / Link Aggregation (link-aggregation, bonding, etherchannel, port-channel) → full page¶

Asset	Type	Level
Case Study: Bonding Failover Not Working	Case Study	L1
Cisco Fundamentals for DevOps	Topic Pack	L1
LACP	Topic Pack	L1
LACP Flashcards	flashcard_deck	L1
Networking Deep Dive	Topic Pack	L1
Case Study: LACP Mismatch One Link Hot	Case Study	L2
Scenario: NIC Flapping / LACP Mismatch	Scenario	L2

Linux Networking Tools (ip-command, ss, tcpdump, ethtool) → full page¶

Asset	Type	Level
Mental Models (Core Concepts)	Topic Pack	L0
Case Study: DHCP Relay Broken	Case Study	L1
Case Study: Duplex Mismatch Symptoms	Case Study	L1
Linux Networking Flashcards	flashcard_deck	L1
Networking Deep Dive	Topic Pack	L1
Networking Drills	Drill	L1
Networking Troubleshooting	Topic Pack	L1
Ops Archaeology: The Gateway That Returns 502	Case Study	L1
Scenario: Duplex Mismatch	Scenario	L1
iptables & nftables	Topic Pack	L1
Case Study: API Latency Spike — BGP Route Leak, Fix Is Network ACL	Case Study	L2
Case Study: ARP Flux Duplicate IP	Case Study	L2
Case Study: IPTables Blocking Unexpected	Case Study	L2
Case Study: Jumbo Frames Partial	Case Study	L2
Case Study: Service Mesh 503s — Envoy Misconfigured, RBAC Policy	Case Study	L2
Case Study: Source Routing Policy Miss	Case Study	L2
Case Study: Stuck NFS Mount	Case Study	L2
Deep Dive: AWS VPC Internals	Deep Dive	L2
Deep Dive: Kubernetes Networking	Deep Dive	L2
Deep Dive: Linux Network Packet Flow	Deep Dive	L2
Deep Dive: TCP/IP Deep Dive	Deep Dive	L2
Ops Archaeology: The Certificate That Works Sometimes	Case Study	L2
Ops Archaeology: The Cluster That Disagrees With Itself	Case Study	L2
Ops Archaeology: The DR That Looks Ready But Isn't	Case Study	L2
Ops Archaeology: The Replica That Fell Behind	Case Study	L2
Ops Archaeology: The Requests That Vanish	Case Study	L2
Scenario: Asymmetric Routing	Scenario	L2
Scenario: MTU Blackhole	Scenario	L2
Scenario: NIC Flapping / LACP Mismatch	Scenario	L2
Scenario: OOB Unreachable but Host Responds	Scenario	L2
VPN & Tunneling	Topic Pack	L2
Wireshark & Packet Analysis	Topic Pack	L2
Deep Dive: eBPF Explained	Deep Dive	L3

Linux Networking Tools (alias → linux_ops) (ip-command, ss, mtr, traceroute)¶

Asset	Type	Level
Linux Ops	Topic Pack	L0

Load Balancing (load-balancer, haproxy, nginx-lb, reverse-proxy) → full page¶

Asset	Type	Level
Load Balancing Flashcards	flashcard_deck	L1
Nginx & Web Servers	Topic Pack	L1
API Gateways & Ingress	Topic Pack	L2
HAProxy & Nginx for Ops	Topic Pack	L2
Runbook: Load Balancer Health Check Failure	Runbook	L2

MTU (mtu-blackhole, jumbo-frames, path-mtu, fragmentation) → full page¶

Asset	Type	Level
MTU	Topic Pack	L1
MTU Flashcards	flashcard_deck	L1
Networking Deep Dive	Topic Pack	L1
Case Study: Jumbo Frames Partial	Case Study	L2
Case Study: MTU Blackhole TLS Stalls	Case Study	L2
Case Study: SSH Timeout — MTU Mismatch, Fix Is Terraform Variable	Case Study	L2
Runbook: MTU Mismatch	Runbook	L2
Scenario: MTU Blackhole	Scenario	L2

Mellanox Switches (mellanox, nvidia-networking, onyx, mlnx-os)¶

Asset	Type	Level
Mellanox Switches Flashcards	flashcard_deck	L1
Mellanox Switches	Topic Pack	L2

NAT (snat, dnat, masquerade, port-forwarding)¶

Asset	Type	Level
NAT	Topic Pack	L1
NAT Flashcards	flashcard_deck	L1

Network Automation (napalm, nornir, netmiko, network-automation)¶

Asset	Type	Level
Network Automation	Topic Pack	L2

Networking Troubleshooting (network-debug, connectivity-issues, packet-loss, latency) → full page¶

Asset	Type	Level
Networking Troubleshooting	Topic Pack	L1
Runbook: DNS Resolution Failure	Runbook	L1
Runbook: Load Balancer Health Check Failure	Runbook	L2
Runbook: MTU Mismatch	Runbook	L2
Runbook: Network Partition (Split Brain / Partial Connectivity)	Runbook	L2

Networking Troubleshooting Tools (tcpdump, nmap, netcat, iperf3)¶

Asset	Type	Level
Networking Troubleshooting	Topic Pack	L1
Tcpdump Flashcards	flashcard_deck	L1

Packet Path (packet-flow, network-path, network-troubleshooting)¶

Asset	Type	Level
Packet Path Flashcards	flashcard_deck	L1
Deep Dive: Linux Network Packet Flow	Deep Dive	L2

Routing (routes, gateway, bgp, ospf) → full page¶

Asset	Type	Level
Networking Deep Dive	Topic Pack	L1
Routing	Topic Pack	L1
Routing Flashcards	flashcard_deck	L1
Skillcheck: Networking Fundamentals	Assessment	L1
Case Study: Asymmetric Routing One Direction	Case Study	L2
Case Study: BGP Peer Flapping	Case Study	L2
Case Study: Multicast Not Crossing Router	Case Study	L2
Case Study: OSPF Stuck In Exstart	Case Study	L2
Case Study: Proxy ARP Causing Issues	Case Study	L2
Case Study: Source Routing Policy Miss	Case Study	L2
Deep Dive: AWS VPC Internals	Deep Dive	L2
Scenario: Asymmetric Routing	Scenario	L2

STP / Spanning Tree (spanning-tree, rstp, bridge-loops) → full page¶

Asset	Type	Level
Cisco Fundamentals for DevOps	Topic Pack	L1
STP (Spanning Tree)	Topic Pack	L1
STP Flashcards	flashcard_deck	L1

Subnetting & IP Addressing (subnetting, cidr, ip-addressing, subnet-mask)¶

Asset	Type	Level
Subnetting & IP Addressing	Topic Pack	L1

TCP/IP (tcp, ip, networking-fundamentals, osi-model) → full page¶

Asset	Type	Level
AWS Networking	Topic Pack	L1
Case Study: Duplex Mismatch Symptoms	Case Study	L1
DHCP & IP Address Management	Topic Pack	L1
Networking Deep Dive	Topic Pack	L1
Networking Drills	Drill	L1
Networking Flashcards	flashcard_deck	L1
Networking Troubleshooting	Topic Pack	L1
Skillcheck: Networking Fundamentals	Assessment	L1
Adversarial Interview Gauntlet (30 sequences)	Scenario	L2
Case Study: NAT Exhaustion Intermittent	Case Study	L2
Case Study: TCP RST After Idle	Case Study	L2
Deep Dive: TCP/IP Deep Dive	Deep Dive	L2
Deep Dive: TLS Handshake	Deep Dive	L2
TCP/IP Deep Dive	Topic Pack	L2

TCP/IP Deep Dive (tcp-states, tcp-handshake, congestion-control, bbr)¶

Asset	Type	Level
TCP/IP Deep Dive	Topic Pack	L2

Tailscale & Zero Trust Networking (tailscale, wireguard, zero-trust, mesh-vpn)¶

Asset	Type	Level
Tailscale & Zero Trust Networking	Topic Pack	L2

VLANs (vlan, trunk, 802.1q, tagged) → full page¶

Asset	Type	Level
Case Study: DHCP Relay Broken	Case Study	L1
Case Study: VLAN Trunk Mistag	Case Study	L1
Cisco Fundamentals for DevOps	Topic Pack	L1
Networking Deep Dive	Topic Pack	L1
Skillcheck: Networking Fundamentals	Assessment	L1
VLANs	Topic Pack	L1
Vlans Flashcards	flashcard_deck	L1
Case Study: Backup Job Failing — iSCSI Target Unreachable, VLAN Misconfigured	Case Study	L2
Case Study: Multicast Not Crossing Router	Case Study	L2
Case Study: Network Loop Broadcast Storm	Case Study	L2
Scenario: VLAN Trunk Mismatch	Scenario	L2

VPN & Tunneling (openvpn, ipsec, ssh-tunnel, overlay-network) → full page¶

Asset	Type	Level
VPN Flashcards	flashcard_deck	L1
Tailscale & Zero Trust Networking	Topic Pack	L2
VPN & Tunneling	Topic Pack	L2

Wireshark & Packet Analysis (wireshark, packet-capture, tshark, pcap)¶

Asset	Type	Level
Wireshark & Packet Analysis	Topic Pack	L2

gRPC & Protocol Buffers (grpc, protobuf, protocol-buffers, grpc-streaming)¶

Asset	Type	Level
gRPC & Protocol Buffers	Topic Pack	L2

Datacenter & Hardware¶

BMC (Baseboard Management Controller) (baseboard-management-controller, bmc-firmware, bmc-network, bmc-reset) → full page¶

Asset	Type	Level
Case Study: iDRAC Unreachable OS Up	Case Study	L1
IPMI and ipmitool	Topic Pack	L1
Redfish API	Topic Pack	L1
Case Study: BMC Clock Skew Cert Failure	Case Study	L2

Datacenter RAID & Disk Failures (alias → disk_and_storage_ops) (raid-failures, disk-failures, raid-rebuild-ops)¶

Asset	Type	Level
Disk & Storage Ops	Topic Pack	L1

Firmware / BIOS / UEFI (bios, uefi, firmware-update, post) → full page¶

Asset	Type	Level
Case Study: BIOS Settings Reset After CMOS	Case Study	L1
Case Study: PXE Boot Fails UEFI Mismatch	Case Study	L1
Datacenter & Server Hardware	Topic Pack	L1
Dell PowerEdge Servers	Topic Pack	L1
Firmware	Topic Pack	L1
Firmware Flashcards	flashcard_deck	L1
Redfish API	Topic Pack	L1
Scenario: Server Won't Boot After Update	Scenario	L1
Case Study: Firmware Update Boot Loop	Case Study	L2
Case Study: HBA Firmware Mismatch	Case Study	L2
Case Study: Node NotReady — NIC Firmware Bug, Fix Is Ansible Playbook	Case Study	L2
Case Study: OS Install Fails RAID Controller	Case Study	L2
Interview: Server Won't POST	Scenario	L2

Hardware Security (bmc-security, ipmi-security, cipher-suite, rakp)¶

Asset	Type	Level
IPMI and ipmitool	Topic Pack	L1
Redfish API	Topic Pack	L1

IPMI / ipmitool (ipmitool, ipmi-protocol, rmcp, lanplus)¶

Asset	Type	Level
IPMI and ipmitool	Topic Pack	L1

Out-of-Band Management (idrac, ilo, ipmi, bmc) → full page¶

Asset	Type	Level
Case Study: Serial Console Garbled	Case Study	L1
Case Study: Server Remote Console Lag	Case Study	L1
Case Study: iDRAC Unreachable OS Up	Case Study	L1
Datacenter & Server Hardware	Topic Pack	L1
Datacenter Drills	Drill	L1
Datacenter Flashcards	flashcard_deck	L1
Dell PowerEdge Servers	Topic Pack	L1
IPMI and ipmitool	Topic Pack	L1
Redfish API	Topic Pack	L1
Scenario: Server Won't Boot After Update	Scenario	L1
Skillcheck: Datacenter	Assessment	L1
Bare-Metal Provisioning	Topic Pack	L2
Case Study: BMC Clock Skew Cert Failure	Case Study	L2
Deep Dive: Dell Linux PowerEdge	Deep Dive	L2
Scenario: OOB Unreachable but Host Responds	Scenario	L2

PXE / Provisioning (pxe-boot, imaging, golden-image, kickstart) → full page¶

Asset	Type	Level
Case Study: PXE Boot Fails UEFI Mismatch	Case Study	L1
Datacenter & Server Hardware	Topic Pack	L1
Bare-Metal Provisioning	Topic Pack	L2

Power & UPS (ups, pdu, power-redundancy, power-management) → full page¶

Asset	Type	Level
Case Study: Power Supply Redundancy Lost	Case Study	L1
Case Study: Rack PDU Overload Alert	Case Study	L1
Power	Topic Pack	L1
Case Study: Server Intermittent Reboot	Case Study	L2

RAID (raid-levels, raid-rebuild, disk-arrays, megaraid) → full page¶

Asset	Type	Level
Datacenter & Server Hardware	Topic Pack	L1
Dell PowerEdge Servers	Topic Pack	L1
Disk & Storage Ops	Topic Pack	L1
Scenario: RAID Array Degraded	Scenario	L1
Skillcheck: Datacenter	Assessment	L1
Case Study: Database Replication Lag — Root Cause Is RAID Degradation	Case Study	L2
Case Study: OS Install Fails RAID Controller	Case Study	L2
Case Study: RAID Degraded Rebuild Latency	Case Study	L2
Deep Dive: RAID and Storage Internals	Deep Dive	L2
Storage Operations	Topic Pack	L2

Rack & Stack (racking, cabling, labeling, airflow) → full page¶

Asset	Type	Level
Case Study: Cable Management Wrong Port	Case Study	L1
Case Study: Link Flaps Bad Optic	Case Study	L1
Case Study: Rack PDU Overload Alert	Case Study	L1
Datacenter & Server Hardware	Topic Pack	L1
Datacenter Drills	Drill	L1
Scenario: Thermal Throttling	Scenario	L1
Skillcheck: Datacenter	Assessment	L1

Redfish API (redfish-api, dmtf-redfish, rest-bmc, redfish-v1)¶

Asset	Type	Level
Redfish API	Topic Pack	L1

Server Hardware (dimm, cpu, nic, hba) → full page¶

Asset	Type	Level
Case Study: BIOS Settings Reset After CMOS	Case Study	L1
Case Study: Cable Management Wrong Port	Case Study	L1
Case Study: Link Flaps Bad Optic	Case Study	L1
Case Study: Memory ECC Errors Increasing	Case Study	L1
Case Study: Power Supply Redundancy Lost	Case Study	L1
Case Study: Serial Console Garbled	Case Study	L1
Case Study: Server Remote Console Lag	Case Study	L1
Case Study: Thermal Throttle Fan Failure	Case Study	L1
Datacenter & Server Hardware	Topic Pack	L1
Dell PowerEdge Servers	Topic Pack	L1
IPMI and ipmitool	Topic Pack	L1
Redfish API	Topic Pack	L1
Scenario: RAID Array Degraded	Scenario	L1
Scenario: Thermal Throttling	Scenario	L1
Server Hardware	Topic Pack	L1
Server Hardware Flashcards	flashcard_deck	L1
Skillcheck: Datacenter	Assessment	L1
Bare-Metal Provisioning	Topic Pack	L2
Case Study: Database Replication Lag — Root Cause Is RAID Degradation	Case Study	L2
Case Study: Firmware Update Boot Loop	Case Study	L2
Case Study: Server Intermittent Reboot	Case Study	L2
Deep Dive: Dell Linux PowerEdge	Deep Dive	L2
Interview: Server Won't POST	Scenario	L2
Scenario: NIC Flapping / LACP Mismatch	Scenario	L2
Virtualization	Topic Pack	L2

Storage (SAN/NAS/DAS) (san, nas, das, iscsi) → full page¶

Asset	Type	Level
Storage Flashcards	flashcard_deck	L1
Case Study: Backup Job Failing — iSCSI Target Unreachable, VLAN Misconfigured	Case Study	L2
Case Study: HBA Firmware Mismatch	Case Study	L2
Case Study: NVMe Drive Disappeared	Case Study	L2
Deep Dive: RAID and Storage Internals	Deep Dive	L2
Storage Operations	Topic Pack	L2

VMware (vsphere, esxi, vcenter, vmware-ha)¶

Asset	Type	Level
VMware Flashcards	flashcard_deck	L1
VMware	Topic Pack	L2

Virtualization (kvm, qemu, libvirt, hypervisor) → full page¶

Asset	Type	Level
Virtualization Flashcards	flashcard_deck	L1
VMware	Topic Pack	L2
Virtualization	Topic Pack	L2

Kubernetes¶

API Gateways & Ingress (kong, traefik, api-management, rate-limiting)¶

Asset	Type	Level
Api Gateway Flashcards	flashcard_deck	L1
API Gateways & Ingress	Topic Pack	L2

Argo Workflows (argo-workflows, dag-workflows, workflow-engine, argo-events)¶

Asset	Type	Level
Argo Workflows	Topic Pack	L2

Cilium & eBPF Networking (cilium, hubble, cilium-cni, ebpf-networking)¶

Asset	Type	Level
Cilium Flashcards	flashcard_deck	L1
Cilium & eBPF Networking	Topic Pack	L2

Container Base Images (base-image, distroless, scratch, alpine-container)¶

Asset	Type	Level
Container Base Images Flashcards	flashcard_deck	L1
Container Images	Topic Pack	L1

Container Image Optimization (alias → container_images) (distroless, multi-stage, slim-images, docker-slim)¶

Asset	Type	Level
Container Images	Topic Pack	L1
Deep Dive: Docker Image Internals	Deep Dive	L2

Container Runtimes (containerd, cri-o, runc, cgroups) → full page¶

Asset	Type	Level
Container Runtime Flashcards	flashcard_deck	L1
Containers Deep Dive	Topic Pack	L1
Interview: Docker Container Debugging	Scenario	L1
Container Runtime Drills	Drill	L2
Deep Dive: Containers How They Really Work	Deep Dive	L2
Skillcheck: Container Runtime Debug	Assessment	L2
cgroups & Linux Namespaces	Topic Pack	L2

CrashLoopBackOff (crashloop, crash-loop, pod-restart) → full page¶

Asset	Type	Level
Runbook: Pod CrashLoopBackOff	Runbook	L1
Incident Simulator (18 scenarios) (CLI)	Exercise Set	L2
Kubernetes Ops (Production)	Topic Pack	L2

CrashLoopBackOff (alias) (crash-loop-backoff, pod-crashloop)¶

Asset	Type	Level
CrashLoopBackOff	Topic Pack	L1
Crashloopbackoff Flashcards	flashcard_deck	L1

Database Locking (row-lock, table-lock, deadlock, optimistic-locking)¶

Asset	Type	Level
Runbook: Long-Running Query / Lock Contention	Runbook	L2

Database Operations (statefulsets, database, mysql, backup-restore) → full page¶

Asset	Type	Level
SQL Fundamentals	Topic Pack	L0
AWS Database Flashcards	flashcard_deck	L1
Database Operations Flashcards	flashcard_deck	L1
Database Operations on Kubernetes	Topic Pack	L2
Database Ops Drills	Drill	L2
PostgreSQL Operations	Topic Pack	L2
Redis Operations	Topic Pack	L2
SQLite Operations & Internals	Topic Pack	L2
Skillcheck: Database Ops	Assessment	L2
Interview: Database Failover During Deploy	Scenario	L3

Database Replication (db-replication, primary-replica, replication-lag)¶

Asset	Type	Level
Runbook: PostgreSQL Replication Lag	Runbook	L2

Docker / Containers (containers, dockerfile, docker-compose, images) → full page¶

Asset	Type	Level
Docker Exercises (Quest Ladder) (CLI)	Exercise Set	L0
Mental Models (Core Concepts)	Topic Pack	L0
Skillcheck: Docker	Assessment	L0
Track: Containers	Reference	L0
Track: Foundations	Reference	L0
Case Study: ImagePullBackOff Registry Auth	Case Study	L1
Container Images	Topic Pack	L1
Containers Deep Dive	Topic Pack	L1
Docker	Topic Pack	L1
Docker Basics Flashcards	flashcard_deck	L1
Docker Drills	Drill	L1
Docker Operations Flashcards	flashcard_deck	L1
Interview: Docker Container Debugging	Scenario	L1
Lab: Trivy Scan Remediation (CLI)	Lab	L1
Ops Archaeology: The Container That Exits Immediately	Case Study	L1
Ops Archaeology: The Deploy That Didn't Deploy	Case Study	L1
Runbook: Container Registry Pull Failure	Runbook	L1
Runbook: ImagePullBackOff	Runbook	L1
AWS ECS	Topic Pack	L2
Case Study: CI Pipeline Fails — Docker Layer Cache Corruption	Case Study	L2
Case Study: Container Vuln Scanner False Positive Blocks Deploy	Case Study	L2
Deep Dive: Containers How They Really Work	Deep Dive	L2
Deep Dive: Docker Image Internals	Deep Dive	L2

Envoy Proxy (envoy-proxy, envoy-xds, l7-proxy)¶

Asset	Type	Level
Envoy Flashcards	flashcard_deck	L1
Envoy Proxy	Topic Pack	L2

HPA / Autoscaling (horizontal-pod-autoscaler, autoscaling, metrics-server) → full page¶

Asset	Type	Level
Kubernetes Exercises (Quest Ladder) (CLI)	Exercise Set	L1
Lab: HPA Live Scaling (CLI)	Lab	L1
Skillcheck: Kubernetes	Assessment	L1
Incident Simulator (18 scenarios) (CLI)	Exercise Set	L2
Interview: HPA Not Scaling	Scenario	L2
Kubernetes Ops (Production)	Topic Pack	L2
Runbook: HPA Not Scaling	Runbook	L2
Runbook: HPA Thrashing (Rapid Scale Up/Down)	Runbook	L2

HashiCorp Consul (consul, consul-connect, service-discovery, hashicorp-consul)¶

Asset	Type	Level
Consul Flashcards	flashcard_deck	L1
HashiCorp Consul	Topic Pack	L2

Istio Service Mesh (istio-mesh, istiod, istio-pilot)¶

Asset	Type	Level
Istio Flashcards	flashcard_deck	L1
Istio Service Mesh	Topic Pack	L2

K8s Ecosystem (kubernetes-ecosystem, k8s-landscape, cncf) → full page¶

Asset	Type	Level
K8s Ecosystem	Topic Pack	L0
Kubernetes Operators Drills	Drill	L3
Skillcheck: Kubernetes Operators	Assessment	L3

K8s HPA (alias → k8s_ops) (horizontal-pod-autoscaler-ops, hpa-ops)¶

Asset	Type	Level
Kubernetes Ops (Production)	Topic Pack	L2

K8s Probes (alias → k8s_ops) (liveness-readiness, probe-ops, health-probes)¶

Asset	Type	Level
Kubernetes Ops (Production)	Topic Pack	L2

Kubernetes Concept Chain (concept-chain, k8s-concepts, k8s-architecture, why-kubernetes)¶

Asset	Type	Level
Kubernetes Concept Chain	Topic Pack	L0
Kubernetes Concept Chain Flashcards	flashcard_deck	L1

Kubernetes Core (kubernetes, pods, deployments, services) → full page¶

Asset	Type	Level
Kubernetes Concept Chain	Topic Pack	L0
Mental Models (Core Concepts)	Topic Pack	L0
Case Study: CrashLoopBackOff No Logs	Case Study	L1
Case Study: ImagePullBackOff Registry Auth	Case Study	L1
Case Study: Service No Endpoints	Case Study	L1
Kubernetes Config Flashcards	flashcard_deck	L1
Kubernetes Core Flashcards	flashcard_deck	L1
Kubernetes Exercises (Quest Ladder) (CLI)	Exercise Set	L1
Kubernetes General Flashcards	flashcard_deck	L1
Kubernetes Operations Flashcards	flashcard_deck	L1
Kubernetes Pods & Scheduling	Topic Pack	L1
Kustomize	Topic Pack	L1
Lab: HPA Live Scaling (CLI)	Lab	L1
Lab: Readiness Probe Failure (CLI)	Lab	L1
Lab: Resource Limits OOMKilled (CLI)	Lab	L1
Openshift Flashcards	flashcard_deck	L1
Ops Archaeology: The Deploy That Didn't Deploy	Case Study	L1
Ops Archaeology: The Pods That Won't Schedule	Case Study	L1
Runbook: Deployment Stuck / Rollout Stalled	Runbook	L1
Runbook: ImagePullBackOff	Runbook	L1
Runbook: OOMKilled Container	Runbook	L1
Runbook: Pod CrashLoopBackOff	Runbook	L1
Runbook: Readiness Probe Failed	Runbook	L1
Skillcheck: Kubernetes	Assessment	L1
Track: Kubernetes Core	Reference	L1
kubectl Debugging Cheatsheet	Reference	L1
kubectl Drills	Drill	L1
Adversarial Interview Gauntlet (30 sequences)	Scenario	L2
Case Study: Alert Storm — Flapping Health Checks	Case Study	L2
Case Study: Canary Deploy Routing to Wrong Backend — Ingress Misconfigured	Case Study	L2
Case Study: DNS Looks Broken — TLS Expired, Fix Is Cert-Manager	Case Study	L2
Case Study: DaemonSet Blocks Eviction	Case Study	L2
Case Study: Deployment Stuck — ImagePull Auth Failure, Vault Secret Rotation	Case Study	L2
Case Study: Drain Blocked by PDB	Case Study	L2
Case Study: HPA Flapping — Metrics Server Clock Skew, Fix Is NTP	Case Study	L2
Case Study: Job Queue Backlog — Worker Pod CPU Throttled by cgroup	Case Study	L2
Case Study: Node NotReady — NIC Firmware Bug, Fix Is Ansible Playbook	Case Study	L2
Case Study: Node Pressure Evictions	Case Study	L2
Case Study: Persistent Volume Stuck Terminating	Case Study	L2
Case Study: Pod OOMKilled — Memory Leak in Sidecar, Fix Is Helm Values	Case Study	L2
Case Study: Resource Quota Blocking Deploy	Case Study	L2
Case Study: User Auth Failing — OIDC Cert Expired, Cloud KMS Rotation	Case Study	L2
Chaos Engineering & Fault Injection	Topic Pack	L2
Chaos Engineering Scripts (CLI)	Exercise Set	L2
Deep Dive: Kubernetes Pod Lifecycle	Deep Dive	L2
Interview: Deployment Stuck Progressing	Scenario	L2
Kubernetes Debugging Playbook	Topic Pack	L2
Ops Archaeology: The Alerts That Stopped Firing	Case Study	L2
Ops Archaeology: The Cluster That Disagrees With Itself	Case Study	L2
Ops Archaeology: The DR That Looks Ready But Isn't	Case Study	L2
Ops Archaeology: The Job That Succeeded Wrong	Case Study	L2
Ops Archaeology: The Session Store That Keeps Dying	Case Study	L2
Platform Engineering Patterns	Topic Pack	L2
Runbook: Disaster Recovery	Runbook	L2
Runbook: HPA Thrashing (Rapid Scale Up/Down)	Runbook	L2
Runbook: Pod Eviction	Runbook	L2
Runbook: Velero Backup & Restore	Runbook	L2
Skillcheck: Kubernetes Under the Covers	Assessment	L2
The Ops of AI/ML Workloads	Topic Pack	L2
Deep Dive: Kubernetes Scheduler	Deep Dive	L3

Kubernetes Debugging (k8s-debug, pod-troubleshooting, kubectl-debug) → full page¶

Asset	Type	Level
Kubernetes Advanced Operations Flashcards	flashcard_deck	L1
Kubernetes Troubleshooting Flashcards	flashcard_deck	L1
Kubernetes Debugging Playbook	Topic Pack	L2

Kubernetes Networking (cni, network-policies, ingress, coredns) → full page¶

Asset	Type	Level
Case Study: Service No Endpoints	Case Study	L1
Docker Networking Flashcards	flashcard_deck	L1
K8s Networking	Topic Pack	L1
Kubernetes Exercises (Quest Ladder) (CLI)	Exercise Set	L1
Kubernetes Networking Flashcards	flashcard_deck	L1
Kubernetes Services & Ingress	Topic Pack	L1
Runbook: DNS Resolution Failure	Runbook	L1
Runbook: Ingress 404	Runbook	L1
Track: Kubernetes Core	Reference	L1
API Gateways & Ingress	Topic Pack	L2
Case Study: CNI Broken After Restart	Case Study	L2
Case Study: Canary Deploy Routing to Wrong Backend — Ingress Misconfigured	Case Study	L2
Case Study: CoreDNS Timeout Pod DNS	Case Study	L2
Case Study: Grafana Dashboard Empty — Prometheus Blocked by NetworkPolicy	Case Study	L2
Case Study: Service Mesh 503s — Envoy Misconfigured, RBAC Policy	Case Study	L2
Cilium & eBPF Networking	Topic Pack	L2
Deep Dive: Kubernetes Networking	Deep Dive	L2
Interview: Ingress 404	Scenario	L2
Kubernetes Ops (Production)	Topic Pack	L2
Multi-Tenancy Patterns	Topic Pack	L2
Ops Archaeology: The 5% That Can't Resolve	Case Study	L2
Ops Archaeology: The Requests That Vanish	Case Study	L2
Runbook: Ingress 502 Bad Gateway	Runbook	L2
Runbook: NetworkPolicy Block	Runbook	L2
Skillcheck: Kubernetes Under the Covers	Assessment	L2
Service Mesh	Topic Pack	L3

Kubernetes Operators (operators, crds, custom-resources, operator-sdk)¶

Asset	Type	Level
K8s Ecosystem	Topic Pack	L0
Kubernetes Operators Flashcards	flashcard_deck	L1

Kubernetes Pods & Scheduling (pods, scheduling, affinity, taints)¶

Asset	Type	Level
Kubernetes Pods & Scheduling	Topic Pack	L1
Kubernetes Workloads Flashcards	flashcard_deck	L1

Kubernetes Services & Ingress (services, ingress, clusterip, nodeport) → full page¶

Asset	Type	Level
Kubernetes Services & Ingress	Topic Pack	L1
Kubernetes Services Flashcards	flashcard_deck	L1
Runbook: Ingress 502 Bad Gateway	Runbook	L2

Kubernetes Storage (pv, pvc, storage-class, csi) → full page¶

Asset	Type	Level
K8s Storage	Topic Pack	L1
Kubernetes Exercises (Quest Ladder) (CLI)	Exercise Set	L1
Kubernetes Storage Flashcards	flashcard_deck	L1
Runbook: PVC Stuck in Pending	Runbook	L1
Track: Kubernetes Core	Reference	L1
Case Study: Persistent Volume Stuck Terminating	Case Study	L2
Database Operations on Kubernetes	Topic Pack	L2

Kustomize (kustomize, kustomization, overlays, patches)¶

Asset	Type	Level
Kustomize	Topic Pack	L1

Multi-Tenancy Patterns (tenant-isolation, noisy-neighbor, fair-scheduling, namespace-isolation)¶

Asset	Type	Level
Multi Tenancy Flashcards	flashcard_deck	L1
Multi-Tenancy Patterns	Topic Pack	L2

Node Lifecycle & Maintenance (node-upgrade, node-drain, pdb, kubelet) → full page¶

Asset	Type	Level
Kubernetes Node Lifecycle Flashcards	flashcard_deck	L1
Node Maintenance	Topic Pack	L1
Runbook: Node NotReady	Runbook	L1
Case Study: DaemonSet Blocks Eviction	Case Study	L2
Kubernetes Node Lifecycle	Topic Pack	L2
Kubernetes Ops (Production)	Topic Pack	L2
Skillcheck: Kubernetes Under the Covers	Assessment	L2

OOMKilled (oom, out-of-memory, resource-limits, memory) → full page¶

Asset	Type	Level
Lab: Resource Limits OOMKilled (CLI)	Lab	L1
Runbook: OOMKilled Container	Runbook	L1
Case Study: Node Pressure Evictions	Case Study	L2
Case Study: Pod OOMKilled — Memory Leak in Sidecar, Fix Is Helm Values	Case Study	L2
Incident Simulator (18 scenarios) (CLI)	Exercise Set	L2
Interview: Pods OOMKilled	Scenario	L2
Kubernetes Ops (Production)	Topic Pack	L2
Ops Archaeology: The Session Store That Keeps Dying	Case Study	L2

OOMKilled (alias) (oom-killed, out-of-memory-killed)¶

Asset	Type	Level
OOMKilled	Topic Pack	L1
Oomkilled Flashcards	flashcard_deck	L1

Policy Engines (opa, gatekeeper, kyverno, admission-control) → full page¶

Asset	Type	Level
Policy Engines Flashcards	flashcard_deck	L1
Interview: Kyverno Blocking Deploys	Scenario	L2
Multi-Tenancy Patterns	Topic Pack	L2
Policy Engine Drills	Drill	L2
Policy Engines (OPA / Kyverno)	Topic Pack	L2
Runbook: Kyverno Blocking Workloads	Runbook	L2
Skillcheck: Policy Engines	Assessment	L2

Probes (Liveness/Readiness) (liveness, readiness, startup-probe, healthcheck) → full page¶

Asset	Type	Level
Kubernetes Exercises (Quest Ladder) (CLI)	Exercise Set	L1
Lab: Readiness Probe Failure (CLI)	Lab	L1
Runbook: Readiness Probe Failed	Runbook	L1
Skillcheck: Kubernetes	Assessment	L1
Track: Kubernetes Core	Reference	L1
Incident Simulator (18 scenarios) (CLI)	Exercise Set	L2
Interview: Deployment Stuck Progressing	Scenario	L2
Kubernetes Ops (Production)	Topic Pack	L2

Progressive Delivery (canary, blue-green, argo-rollouts, flagger)¶

Asset	Type	Level
Progressive Delivery	Topic Pack	L2

RBAC (roles, clusterroles, service-accounts, rbac) → full page¶

Asset	Type	Level
K8s RBAC	Topic Pack	L1
Kubernetes Exercises (Quest Ladder) (CLI)	Exercise Set	L1
Kubernetes RBAC Flashcards	flashcard_deck	L1
Kubernetes Security Flashcards	flashcard_deck	L1
Track: Kubernetes Core	Reference	L1
Interview: RBAC Forbidden	Scenario	L2
Multi-Tenancy Patterns	Topic Pack	L2
Policy Engines (OPA / Kyverno)	Topic Pack	L2
Runbook: RBAC Forbidden	Runbook	L2

Service Mesh (istio, linkerd, envoy, sidecar) → full page¶

Asset	Type	Level
Service Mesh Flashcards	flashcard_deck	L1
Interview: Service Mesh 503s	Scenario	L3
Runbook: Istio 503 Errors	Runbook	L3
Service Mesh	Topic Pack	L3
Service Mesh Drills	Drill	L3
Skillcheck: Service Mesh	Assessment	L3

cert-manager (cert-manager, lets-encrypt, acme, tls-automation)¶

Asset	Type	Level
cert-manager	Topic Pack	L1

etcd (etcd-backup, etcd-restore, etcd-cluster) → full page¶

Asset	Type	Level
etcd	Topic Pack	L1
etcd Flashcards	flashcard_deck	L1
Runbook: etcd Backup & Restore	Runbook	L2
Skillcheck: etcd	Assessment	L2
etcd Drills	Drill	L2
Interview: etcd Space Exceeded	Scenario	L3
Runbook: etcd High Latency / Slow Operations	Runbook	L3
Scenario: etcd Troubleshooting	Scenario	L3

DevOps & Tooling¶

AI Tools for DevOps (ai, llm, chatgpt, claude) → full page¶

Asset	Type	Level
AI Tools for DevOps	Topic Pack	L1
AI-Assisted DevOps Cookbook	Reference	L1
Generativeai Flashcards	flashcard_deck	L1
The Ops of AI/ML Workloads	Topic Pack	L2

AI/ML Infrastructure Ops (gpu-scheduling, model-serving, vllm, triton) → full page¶

Asset	Type	Level
Datascience Flashcards	flashcard_deck	L1
MLOps Flashcards	flashcard_deck	L1
The Ops of AI/ML Workloads	Topic Pack	L2

Ansible (playbooks, roles, inventory, ansible-galaxy) → full page¶

Asset	Type	Level
Ansible Lab: Facts and Variables	Lab	L0
Ansible Lab: Ping and Debug	Lab	L0
Break/Fix: Wrong Module Parameter	Scenario	L0
Break/Fix: YAML Indentation Error	Scenario	L0
Mental Models (Core Concepts)	Topic Pack	L0
Ansible Automation	Topic Pack	L1
Ansible Core Flashcards	flashcard_deck	L1
Ansible Drills	Drill	L1
Ansible Exercises (Quest Ladder) (CLI)	Exercise Set	L1
Ansible Lab: Conditionals and Loops	Lab	L1
Ansible Lab: Install Nginx (Idempotency)	Lab	L1
Ansible Lab: Roles	Lab	L1
Ansible Lab: Templates and Handlers	Lab	L1
Ansible Operations Flashcards	flashcard_deck	L1
Ansible Playbooks Flashcards	flashcard_deck	L1
Break/Fix: Handler Name Mismatch	Scenario	L1
Break/Fix: Jinja2 Syntax Error in Template	Scenario	L1
Break/Fix: Privilege Escalation Missing	Scenario	L1
Break/Fix: Task Ordering / Dependency	Scenario	L1
Break/Fix: Undefined Variable + Bare Jinja2	Scenario	L1
Break/Fix: Wrong Host Scope	Scenario	L1
Chef Flashcards	flashcard_deck	L1
Puppet Flashcards	flashcard_deck	L1
Runbook: Ansible Playbook Failure	Runbook	L1
Saltstack Flashcards	flashcard_deck	L1
Skillcheck: Ansible	Assessment	L1
Track: Infrastructure	Reference	L1
Ansible Deep Dive	Topic Pack	L2
Ansible Lab: Vault (Secrets Management)	Lab	L2
Case Study: Ansible Playbook Hangs — SSH Agent Forwarding Blocked by Firewall	Case Study	L2
Case Study: Node NotReady — NIC Firmware Bug, Fix Is Ansible Playbook	Case Study	L2
Fleet Operations at Scale	Topic Pack	L2
RHCE (EX294) Exam Preparation	Topic Pack	L2

Ansible Deep Dive (ansible-roles, ansible-vault, ansible-collections, jinja2) → full page¶

Asset	Type	Level
Ansible Lab: Roles	Lab	L1
Ansible Lab: Templates and Handlers	Lab	L1
Break/Fix: Handler Name Mismatch	Scenario	L1
Break/Fix: Jinja2 Syntax Error in Template	Scenario	L1
Break/Fix: Undefined Variable + Bare Jinja2	Scenario	L1
Ansible Deep Dive	Topic Pack	L2
Ansible Lab: Vault (Secrets Management)	Lab	L2

ArgoCD & GitOps (argocd, gitops, fluxcd, flux)¶

Asset	Type	Level
ArgoCD & GitOps	Topic Pack	L2

Backstage & Developer Portals (backstage, spotify-backstage, developer-portal, software-catalog)¶

Asset	Type	Level
Backstage & Developer Portals	Topic Pack	L2

CI/CD (continuous-integration, continuous-delivery, pipelines, jenkins) → full page¶

Asset	Type	Level
Mental Models (Core Concepts)	Topic Pack	L0
CI Pipeline Documentation	Reference	L1
CI/CD Drills	Drill	L1
CI/CD Flashcards	flashcard_deck	L1
CI/CD Pipelines & Patterns	Topic Pack	L1
Circleci Flashcards	flashcard_deck	L1
GitHub Actions	Topic Pack	L1
Jenkins Flashcards	flashcard_deck	L1
Runbook: Build Failure Triage	Runbook	L1
Runbook: Container Registry Pull Failure	Runbook	L1
Runbook: Deploy Rollback	Runbook	L1
Runbook: Pipeline Stuck / Hung Job	Runbook	L1
Skillcheck: CI/CD	Assessment	L1
Zuul Flashcards	flashcard_deck	L1
Adversarial Interview Gauntlet (30 sequences)	Scenario	L2
Dagger / CI as Code	Topic Pack	L2
Deep Dive: CI/CD Pipeline Architecture	Deep Dive	L2
Interview: CI Vuln Scan Failed	Scenario	L2
Platform Engineering Patterns	Topic Pack	L2

CI/CD Patterns (ci-cd-patterns, deployment-strategies, canary, blue-green)¶

Asset	Type	Level
CI/CD Pipelines & Patterns	Topic Pack	L1

CI/CD Pipelines Realities (pipeline-realities, cicd-real-world, pipeline-gotchas)¶

Asset	Type	Level
CI/CD Pipelines & Patterns	Topic Pack	L1
Runbook: Build Failure Triage	Runbook	L1

CSS (css, frontend, web, stylesheets)¶

Asset	Type	Level
CSS Fundamentals	Topic Pack	L0
CSS Flashcards	flashcard_deck	L1

Capacity Planning (forecasting, resource-modeling, growth-planning, trend-analysis)¶

Asset	Type	Level
Capacity Planning Flashcards	flashcard_deck	L1
Capacity Planning	Topic Pack	L2

Career Engineering (resume, interview-prep, career-strategy, job-search) → full page¶

Asset	Type	Level
Career Engineering for Ops People	Topic Pack	L0
Corporate IT Fluency for Engineers	Topic Pack	L0
Grokdevops Training Flashcards	flashcard_deck	L1

Ceph Storage (ceph, cephadm, rook-ceph, rados)¶

Asset	Type	Level
Ceph Storage	Topic Pack	L2

Certificates (tls-certificates, ssl-certificates, pki, certificate-lifecycle)¶

Asset	Type	Level
Certificates	Topic Pack	L2

Change Management (change-window, rollback-plan, cab, change-freeze)¶

Asset	Type	Level
Change Management	Topic Pack	L1
Change Management Flashcards	flashcard_deck	L1

Chaos Engineering (chaos-mesh, litmus, fault-injection, game-day)¶

Asset	Type	Level
Chaos Engineering Flashcards	flashcard_deck	L1
Chaos Engineering & Fault Injection	Topic Pack	L2

Claude Code (claude, claude-ai, ai-coding-assistant, claude-cli)¶

Asset	Type	Level
Claude Code	Topic Pack	L1
Claude Code Flashcards	flashcard_deck	L1

Configuration Management (configuration-management, config-management, config-drift, infrastructure-as-code)¶

Asset	Type	Level
Automation	Topic Pack	L1
Configuration Management	Topic Pack	L1

Containers Deep Dive (containers-internals, overlayfs, oci, buildkit) → full page¶

Asset	Type	Level
Containers Deep Dive	Topic Pack	L1
Docker Security Flashcards	flashcard_deck	L1
Docker Storage Flashcards	flashcard_deck	L1

Corporate IT Fluency (itsm, itil, cab, cmdb)¶

Asset	Type	Level
Corporate IT Fluency for Engineers	Topic Pack	L0
Corporate It Fluency Flashcards	flashcard_deck	L1

Crossplane (crossplane, k8s-iac, compositions, managed-resources)¶

Asset	Type	Level
Crossplane	Topic Pack	L2

DORA Metrics & DevEx (dora, deployment-frequency, lead-time, mttr)¶

Asset	Type	Level
DORA Metrics & DevEx	Topic Pack	L1

Dagger / CI as Code (dagger, ci-as-code, pipeline-sdk, portable-ci)¶

Asset	Type	Level
Dagger / CI as Code	Topic Pack	L2

Data Modeling (data-modeling, schema-design, data-architecture, normalization)¶

Asset	Type	Level
Data Modeling	Topic Pack	L2

Database Internals (db-internals, storage-engine, write-ahead-log, mvcc)¶

Asset	Type	Level
Database Internals	Topic Pack	L1
Database Internals Flashcards	flashcard_deck	L1

Databases (database, rdbms, nosql, database-selection)¶

Asset	Type	Level
Databases	Topic Pack	L2

Debugging Methodology (systematic-troubleshooting, divide-and-conquer, hypothesis-testing, five-whys)¶

Asset	Type	Level
Debugging Methodology	Topic Pack	L1
Debugging Methodology Flashcards	flashcard_deck	L1

Deployments (deploy, release-engineering, rolling-update, blue-green)¶

Asset	Type	Level
Deployments	Topic Pack	L1

Distributed Systems Fundamentals (cap-theorem, raft, consensus, eventual-consistency)¶

Asset	Type	Level
Distributed Systems Fundamentals	Topic Pack	L2

Edge & IoT Infrastructure (edge-computing, iot, constrained-devices, ota-updates)¶

Asset	Type	Level
Edge IoT Flashcards	flashcard_deck	L1
Edge & IoT Infrastructure	Topic Pack	L2

Elasticsearch (elastic, elk, opensearch, search-engine)¶

Asset	Type	Level
Elasticsearch	Topic Pack	L1
Elasticsearch Flashcards	flashcard_deck	L1

Feature Flags (feature-flags, openfeature, launchdarkly, flagsmith)¶

Asset	Type	Level
Feature Flags	Topic Pack	L1

FinOps (cost-optimization, cloud-billing, reserved-instances, spot) → full page¶

Asset	Type	Level
Finops Flashcards	flashcard_deck	L1
FinOps & Cost Optimization	Topic Pack	L2
FinOps Drills	Drill	L2
Interview: Cost Spike Investigation	Scenario	L2
Skillcheck: FinOps	Assessment	L2

Fleet Operations (fleet-management, fleet-automation, at-scale, parallel-execution)¶

Asset	Type	Level
Fleet Operations Flashcards	flashcard_deck	L1
Fleet Operations at Scale	Topic Pack	L2

Git (version-control, branching, merging, rebase) → full page¶

Asset	Type	Level
Git Drills	Drill	L0
Git for DevOps	Topic Pack	L0
Mental Models (Core Concepts)	Topic Pack	L0
Skillcheck: Git	Assessment	L0
Track: Foundations	Reference	L0
Git Flashcards	flashcard_deck	L1
Repository Flashcards	flashcard_deck	L1
Git Advanced	Topic Pack	L2
Interview: Secret Leaked to Git	Scenario	L2
RHCE (EX294) Exam Preparation	Topic Pack	L2

Git Advanced (rebase, cherry-pick, bisect, reflog)¶

Asset	Type	Level
Git Advanced	Topic Pack	L2

Git Save Your Ass (git-recovery, git-reflog, git-rescue, git-undo)¶

Asset	Type	Level
Git Advanced	Topic Pack	L2

Git Workflows & Branching Strategies (branching-strategy, trunk-based, github-flow, gitflow)¶

Asset	Type	Level
Git Workflows Flashcards	flashcard_deck	L1
Git Workflows & Branching Strategies	Topic Pack	L2

GitHub Actions (github-actions, gha, workflows, actions-runner)¶

Asset	Type	Level
GitHub Actions	Topic Pack	L1
Deep Dive: CI/CD Pipeline Architecture	Deep Dive	L2

GitOps (argocd, argo, flux, desired-state) → full page¶

Asset	Type	Level
Argo Flashcards	flashcard_deck	L1
GitOps	Topic Pack	L1
Gitops Flashcards	flashcard_deck	L1
Runbook: Deploy Rollback	Runbook	L1
Track: Helm & Release Ops	Reference	L1
GitOps & ArgoCD Drills	Drill	L2
Interview: Config Drift Detected	Scenario	L2
Interview: GitOps Drift Detected	Scenario	L2
Lab: GitOps Sync and Drift (CLI)	Lab	L2
Runbook: ArgoCD Out of Sync	Runbook	L2
Skillcheck: GitOps	Assessment	L2

GraphQL (graphql-api, gql, apollo, relay)¶

Asset	Type	Level
Graphql Flashcards	flashcard_deck	L1
GraphQL	Topic Pack	L2

Helm (helm-charts, helm-upgrade, helm-rollback, values-files) → full page¶

Asset	Type	Level
Helm	Topic Pack	L1
Helm Drills	Drill	L1
Helm Flashcards	flashcard_deck	L1
Lab: Helm Upgrade Rollback (CLI)	Lab	L1
Runbook: Helm Upgrade Failed	Runbook	L1
Skillcheck: Helm & Release Ops	Assessment	L1
Track: Helm & Release Ops	Reference	L1
Case Study: Pod OOMKilled — Memory Leak in Sidecar, Fix Is Helm Values	Case Study	L2
Incident Simulator (18 scenarios) (CLI)	Exercise Set	L2
Interview: Helm Upgrade Broke Prod	Scenario	L2

Homelab (proxmox, pihole, wireguard, self-hosted)¶

Asset	Type	Level
Homelab & Learning Infrastructure	Topic Pack	L0
Homelab Flashcards	flashcard_deck	L1

Incident Psychology (cognitive-bias, stress-response, communication-under-pressure)¶

Asset	Type	Level
Incident Psychology Flashcards	flashcard_deck	L1
The Psychology of Incidents	Topic Pack	L2

Incident Response (incidents, triage, forensics, rca) → full page¶

Asset	Type	Level
Change Management	Topic Pack	L1
Debugging Methodology	Topic Pack	L1
Incident Response Flashcards	flashcard_deck	L1
Runbook Craft	Topic Pack	L1
Systems Thinking for Engineers	Topic Pack	L1
Vendor Management & Escalation	Topic Pack	L1
Chaos Engineering Scripts (CLI)	Exercise Set	L2
Incident Command & On-Call	Topic Pack	L2
Incident Simulator (18 scenarios) (CLI)	Exercise Set	L2
Investigation Engine (CLI)	Exercise Set	L2
Ops War Stories & Pattern Recognition	Topic Pack	L2
Postmortems & SLOs	Topic Pack	L2
The Psychology of Incidents	Topic Pack	L2
Track: Incident Response	Reference	L2

Infrastructure Testing (terratest, inspec, conftest, rego)¶

Asset	Type	Level
Infrastructure Testing	Topic Pack	L2

Kafka (message-queue, event-streaming, kafka-connect, kafka-streams) → full page¶

Asset	Type	Level
Kafka	Topic Pack	L1
Kafka Flashcards	flashcard_deck	L1
RabbitMQ & Message Queues	Topic Pack	L2

Legacy System Archaeology (inherited-systems, undocumented, reverse-engineering, tribal-knowledge)¶

Asset	Type	Level
Legacy System Archaeology	Topic Pack	L1
Legacy Systems Flashcards	flashcard_deck	L1

Load Testing (k6, gatling, locust, load-testing)¶

Asset	Type	Level
Load Testing	Topic Pack	L1

Make & Build Systems (make, makefile, gnu-make, just)¶

Asset	Type	Level
Make & Build Systems	Topic Pack	L1

Mental Models (Core) (mental-models, conceptual-models, mental-model-first) → full page¶

Asset	Type	Level
Mental Models (Core Concepts)	Topic Pack	L0
Mental Models (Core) Flashcards	flashcard_deck	L0
Mental-Model-First Learning Guide	Reference	L0

Message Queues (message-queues, rabbitmq, kafka, amqp)¶

Asset	Type	Level
Message Queues Flashcards	flashcard_deck	L1
Message Queues	Topic Pack	L2

MongoDB Operations (mongodb, mongo, replica-set, sharding)¶

Asset	Type	Level
MongoDB Operations	Topic Pack	L1

MySQL / MariaDB Operations (mysql, mariadb, innodb, percona)¶

Asset	Type	Level
MySQL / MariaDB Operations	Topic Pack	L1

Nginx & Web Servers (nginx, apache, httpd, reverse-proxy)¶

Asset	Type	Level
NGINX Flashcards	flashcard_deck	L1
Nginx & Web Servers	Topic Pack	L1

Nix / NixOS (nix, nixos, nix-flakes, nixpkgs)¶

Asset	Type	Level
Nix / NixOS	Topic Pack	L2

On-Call & Incident Command (pagerduty, opsgenie, incident-commander, escalation) → full page¶

Asset	Type	Level
On Call Flashcards	flashcard_deck	L1
Runbook Craft	Topic Pack	L1
Vendor Management & Escalation	Topic Pack	L1
Incident Command & On-Call	Topic Pack	L2
On-Call	Topic Pack	L2
The Psychology of Incidents	Topic Pack	L2

OpenTofu & Terraform Ecosystem (opentofu, tofu, terraform-fork, bsl)¶

Asset	Type	Level
OpenTofu & Terraform Ecosystem	Topic Pack	L2

Ops War Stories (pattern-recognition, differential-diagnosis, experience-transfer)¶

Asset	Type	Level
Operations War Stories Flashcards	flashcard_deck	L1
Ops War Stories & Pattern Recognition	Topic Pack	L2

Packer (hashicorp-packer, image-builder, machine-images, ami-builder)¶

Asset	Type	Level
Packer	Topic Pack	L1

Performance (performance-engineering, performance-tuning, bottleneck-analysis, profiling)¶

Asset	Type	Level
Performance	Topic Pack	L2

Platform Engineering (internal-developer-platform, idp, golden-path, self-service) → full page¶

Asset	Type	Level
Platform Engineering Flashcards	flashcard_deck	L1
Backstage & Developer Portals	Topic Pack	L2
Platform Engineering Patterns	Topic Pack	L2

PostgreSQL Operations (postgres, postgresql, pg, vacuuming) → full page¶

Asset	Type	Level
PostgreSQL Operations	Topic Pack	L2
Runbook: Long-Running Query / Lock Contention	Runbook	L2
Runbook: PostgreSQL Connection Exhaustion	Runbook	L2
Runbook: PostgreSQL Disk Space Critical	Runbook	L2
Runbook: PostgreSQL Replication Lag	Runbook	L2

Postmortems & SLOs (slo, sli, sla, error-budget) → full page¶

Asset	Type	Level
Devops Flashcards	flashcard_deck	L1
Postmortem SLO Flashcards	flashcard_deck	L1
Postmortem & SLO Drills	Drill	L2
Postmortems & SLOs	Topic Pack	L2
SRE Practices	Topic Pack	L2
Skillcheck: Postmortems & SLOs	Assessment	L2

PowerShell (pwsh, powershell-core, windows-scripting, powershell-automation)¶

Asset	Type	Level
PowerShell	Topic Pack	L1

Pulumi (pulumi, iac-sdk, pulumi-python, pulumi-typescript)¶

Asset	Type	Level
Pulumi	Topic Pack	L2

Python Async & Concurrency (asyncio, threading, multiprocessing, async-await)¶

Asset	Type	Level
Python Async & Concurrency	Topic Pack	L2

Python Automation (python, scripting, automation, perl) → full page¶

Asset	Type	Level
Python Drills	Drill	L0
Python Exercises (Quest Ladder) (CLI)	Exercise Set	L0
Skillcheck: Python Automation	Assessment	L0
Perl Flashcards	flashcard_deck	L1
Python Debugging	Topic Pack	L1
Python Flashcards	flashcard_deck	L1
Python for Infrastructure	Topic Pack	L1
Software Development Flashcards	flashcard_deck	L1
Python Async & Concurrency	Topic Pack	L2
Python Packaging	Topic Pack	L2

Python Debugging (pdb, debugpy, py-spy, traceback)¶

Asset	Type	Level
Python Debugging	Topic Pack	L1

Python Packaging (pip, virtualenv, venv, pyproject-toml)¶

Asset	Type	Level
Python Packaging	Topic Pack	L2

RHCE (EX294) Exam (rhce, ex294, red-hat-certified-engineer, ansible-automation)¶

Asset	Type	Level
RHCE Flashcards	flashcard_deck	L1
RHCE (EX294) Exam Preparation	Topic Pack	L2

RabbitMQ & Message Queues (rabbitmq, amqp, message-queue, message-broker)¶

Asset	Type	Level
RabbitMQ & Message Queues	Topic Pack	L2

Redis Operations (redis, redis-cluster, redis-sentinel, caching)¶

Asset	Type	Level
Redis Operations	Topic Pack	L2

Reliability Patterns (reliability-patterns, circuit-breaker, bulkhead, graceful-degradation)¶

Asset	Type	Level
Reliability Patterns	Topic Pack	L2

Runbook Craft (runbook-writing, decision-tree, escalation-docs, operational-docs)¶

Asset	Type	Level
Runbook Craft	Topic Pack	L1
Runbook Craft Flashcards	flashcard_deck	L1

S3-Compatible Object Storage (minio, s3, object-storage, bucket)¶

Asset	Type	Level
S3-Compatible Object Storage	Topic Pack	L1

SQL (sql, querying, select, databases) → full page¶

Asset	Type	Level
SQL Fundamentals	Topic Pack	L0
Databases Flashcards	flashcard_deck	L1
SQL Flashcards	flashcard_deck	L1

SQLite Operations & Internals (sqlite, litestream, litefs, turso)¶

Asset	Type	Level
SQLite Operations & Internals	Topic Pack	L2

SRE Practices (site-reliability, toil, error-budget, reliability-engineering) → full page¶

Asset	Type	Level
Change Management	Topic Pack	L1
Capacity Planning	Topic Pack	L2
SRE Practices	Topic Pack	L2

Systems Thinking (feedback-loops, emergent-behavior, coupling, cascading-failures) → full page¶

Asset	Type	Level
Debugging Methodology	Topic Pack	L1
Systems Thinking Flashcards	flashcard_deck	L1
Systems Thinking for Engineers	Topic Pack	L1

Terraform (iac, infrastructure-as-code, hcl, tfstate) → full page¶

Asset	Type	Level
Mental Models (Core Concepts)	Topic Pack	L0
Skillcheck: Terraform / IaC	Assessment	L1
Terraform / IaC	Topic Pack	L1
Terraform Basics Flashcards	flashcard_deck	L1
Terraform Drills	Drill	L1
Track: Infrastructure	Reference	L1
Case Study: SSH Timeout — MTU Mismatch, Fix Is Terraform Variable	Case Study	L2
Case Study: Terraform Apply Fails — State Lock Stuck, DynamoDB Throttle	Case Study	L2
Crossplane	Topic Pack	L2
Deep Dive: Terraform State Internals	Deep Dive	L2
OpenTofu & Terraform Ecosystem	Topic Pack	L2
Pulumi	Topic Pack	L2
Runbook: Cloud Capacity Limit Hit	Runbook	L2
Runbook: Terraform Drift Detection Response	Runbook	L2
Runbook: Terraform State Lock Stuck	Runbook	L2
Terraform Deep Dive	Topic Pack	L2

Terraform Deep Dive (terraform-state, terraform-modules, terraform-import, hcl-advanced) → full page¶

Asset	Type	Level
Terraform Modules Flashcards	flashcard_deck	L1
Terraform Providers Flashcards	flashcard_deck	L1
Terraform State Flashcards	flashcard_deck	L1
Terraform Workflow Flashcards	flashcard_deck	L1
Runbook: Terraform Drift Detection Response	Runbook	L2
Terraform Deep Dive	Topic Pack	L2

Toil Reduction (toil-reduction, toil-elimination, operational-toil)¶

Asset	Type	Level
Toil Reduction	Topic Pack	L2

VS Code (visual-studio-code, editor, ide, remote-development)¶

Asset	Type	Level
VS Code for DevOps	Topic Pack	L0
VS Code Flashcards	flashcard_deck	L1

Vendor Management & Escalation (tac-case, rma, support-tiers, vendor-escalation)¶

Asset	Type	Level
Vendor Management & Escalation	Topic Pack	L1
Vendor Management Flashcards	flashcard_deck	L1

WebAssembly for Infrastructure (wasm, wasi, spin, wasmcloud)¶

Asset	Type	Level
WebAssembly for Infrastructure	Topic Pack	L3

CLI Tools¶

Modern CLI Tools (bat, eza, zoxide, dust) → full page¶

Asset	Type	Level
Modern CLI Drills	Drill	L0
Modern CLI Tools	Topic Pack	L0
Skillcheck: Modern CLI Tools	Assessment	L0
CLI Tools Flashcards	flashcard_deck	L1
Modern CLI Flashcards	flashcard_deck	L1

Modern CLI Workflows (cli-workflows, modern-shell, terminal-workflows)¶

Asset	Type	Level
Modern Cli Workflows	Topic Pack	L1

Regex & Text Wrangling (sed, awk, grep, regex)¶

Asset	Type	Level
Regex & Text Wrangling	Topic Pack	L1
Regular Expressions Flashcards	flashcard_deck	L1

YAML, JSON & Config Formats (yaml, json, toml, ini)¶

Asset	Type	Level
YAML, JSON & Config Formats	Topic Pack	L1

awk (gawk, awk-scripting, record-processor, field-processor)¶

Asset	Type	Level
awk: The Record/Field Processor	Topic Pack	L1

curl & wget (curl, wget, http-client, api-testing)¶

Asset	Type	Level
curl & wget	Topic Pack	L1

fd (fd-find, fast-find, file-search) → full page¶

Asset	Type	Level
Modern CLI Tools	Topic Pack	L0
Skillcheck: Modern CLI Tools	Assessment	L0
fd	Topic Pack	L1
fd Flashcards	flashcard_deck	L1

find (find, file-search, find-exec, locate)¶

Asset	Type	Level
find	Topic Pack	L1

fzf (fuzzy-finder, interactive-selection) → full page¶

Asset	Type	Level
Modern CLI Drills	Drill	L0
Modern CLI Tools	Topic Pack	L0
Skillcheck: Modern CLI Tools	Assessment	L0
fzf	Topic Pack	L1
fzf Flashcards	flashcard_deck	L1

grep & Regular Expressions (grep, regex, regexp, egrep)¶

Asset	Type	Level
grep & Regular Expressions	Topic Pack	L1

jq / JSON Processing (jq-filters, yq, json, yaml-processing) → full page¶

Asset	Type	Level
Modern CLI Drills	Drill	L0
Modern CLI Tools	Topic Pack	L0
Skillcheck: Modern CLI Tools	Assessment	L0
YAML, JSON & Config Formats	Topic Pack	L1
jq	Topic Pack	L1
jq Flashcards	flashcard_deck	L1

ripgrep (rg) (rg, fast-grep, code-search) → full page¶

Asset	Type	Level
Modern CLI Drills	Drill	L0
Modern CLI Tools	Topic Pack	L0
Skillcheck: Modern CLI Tools	Assessment	L0
Ripgrep Flashcards	flashcard_deck	L1
ripgrep	Topic Pack	L1

sed (gsed, stream-editor, sed-scripting, in-place-edit)¶

Asset	Type	Level
sed: The Stream Editor	Topic Pack	L1

xargs (xargs, parallel-exec, pipe-to-args, batch-commands)¶

Asset	Type	Level
xargs	Topic Pack	L1

Observability¶

Alerting Rules (alertmanager, alert-rules, pagerduty, on-call) → full page¶

Asset	Type	Level
Alerting Flashcards	flashcard_deck	L1
Alerting Rules	Topic Pack	L2
Alerting Rules Drills	Drill	L2
Case Study: Alert Storm — Flapping Health Checks	Case Study	L2
On-Call	Topic Pack	L2
Runbook: Alert Storm (Flapping / Too Many Alerts)	Runbook	L2
SRE Practices	Topic Pack	L2
Skillcheck: Alerting Rules	Assessment	L2

Continuous Profiling (pyroscope, parca, profiling, flame-graphs)¶

Asset	Type	Level
Continuous Profiling	Topic Pack	L2

Grafana (dashboards, panels, data-sources) → full page¶

Asset	Type	Level
Grafana Flashcards	flashcard_deck	L1
Monitoring Fundamentals	Topic Pack	L1
Runbook: Grafana Dashboard Blank / No Data	Runbook	L1
Lab: Prometheus Target Down (CLI)	Lab	L2
Monitoring Migration (Legacy to Modern)	Topic Pack	L2
Observability Architecture	Reference	L2
Observability Deep Dive	Topic Pack	L2
Skillcheck: Observability	Assessment	L2
Track: Observability	Reference	L2

Log Pipelines (fluentd, fluentbit, vector, log-routing) → full page¶

Asset	Type	Level
Log Pipelines Flashcards	flashcard_deck	L1
Log Pipelines	Topic Pack	L2
Runbook: Log Pipeline Backpressure / Logs Not Appearing	Runbook	L2

Logging (log-management, centralized-logging, log-pipeline)¶

Asset	Type	Level
Linux Logging	Topic Pack	L1
Log Pipelines	Topic Pack	L2

Loki (logs, log-aggregation, promtail, logql) → full page¶

Asset	Type	Level
Loki Flashcards	flashcard_deck	L1
Incident Simulator (18 scenarios) (CLI)	Exercise Set	L2
Interview: Loki Logs Disappeared	Scenario	L2
Lab: Loki No Logs (CLI)	Lab	L2
Log Pipelines	Topic Pack	L2
LogQL Drills	Drill	L2
Observability Architecture	Reference	L2
Observability Deep Dive	Topic Pack	L2
Observability Drills	Drill	L2
Runbook: Log Pipeline Backpressure / Logs Not Appearing	Runbook	L2
Runbook: Loki No Logs	Runbook	L2
Skillcheck: Observability	Assessment	L2
Track: Observability	Reference	L2

Monitoring Fundamentals (nagios, zabbix, snmp, cacti)¶

Asset	Type	Level
Monitoring Fundamentals	Topic Pack	L1
Monitoring Migration (Legacy to Modern)	Topic Pack	L2

Monitoring Migration (nagios-to-prometheus, zabbix-migration, monitoring-modernization)¶

Asset	Type	Level
Monitoring Migration (Legacy to Modern)	Topic Pack	L2

Observability Deep Dive (observability-deep-dive, o11y-deep-dive)¶

Asset	Type	Level
Mental Models (Core Concepts)	Topic Pack	L0
Observability Flashcards	flashcard_deck	L1

OpenTelemetry (otel, otel-collector, instrumentation, unified-observability)¶

Asset	Type	Level
OpenTelemetry	Topic Pack	L2

Prometheus (metrics, promql, service-monitor, alertmanager) → full page¶

Asset	Type	Level
Datadog Flashcards	flashcard_deck	L1
Monitoring Flashcards	flashcard_deck	L1
Monitoring Fundamentals	Topic Pack	L1
Runbook: Prometheus Target Down	Runbook	L1
Adversarial Interview Gauntlet (30 sequences)	Scenario	L2
Alerting Rules	Topic Pack	L2
Alerting Rules Drills	Drill	L2
Capacity Planning	Topic Pack	L2
Case Study: Disk Full — Runaway Logs, Fix Is Loki Retention	Case Study	L2
Case Study: Grafana Dashboard Empty — Prometheus Blocked by NetworkPolicy	Case Study	L2
Incident Simulator (18 scenarios) (CLI)	Exercise Set	L2
Interview: Prometheus Target Down	Scenario	L2
Lab: Prometheus Target Down (CLI)	Lab	L2
Monitoring Migration (Legacy to Modern)	Topic Pack	L2
Observability Architecture	Reference	L2
Observability Deep Dive	Topic Pack	L2
Observability Drills	Drill	L2
OpenTelemetry	Topic Pack	L2
Ops Archaeology: The Alerts That Stopped Firing	Case Study	L2
Ops Archaeology: The Slow Death Nobody Noticed	Case Study	L2
PromQL Drills	Drill	L2
Prometheus Deep Dive	Topic Pack	L2
Runbook: Alert Storm (Flapping / Too Many Alerts)	Runbook	L2
Skillcheck: Alerting Rules	Assessment	L2
Skillcheck: Observability	Assessment	L2
Track: Observability	Reference	L2

Prometheus Deep Dive (prometheus, promql, alertmanager, scrape)¶

Asset	Type	Level
Prometheus Stack Flashcards	flashcard_deck	L1
Prometheus Deep Dive	Topic Pack	L2

SLO Tooling (sloth, pyrra, openslo, slo)¶

Asset	Type	Level
SLO Tooling	Topic Pack	L2

Synthetic Monitoring (blackbox-exporter, synthetic-monitoring, checkly, probe)¶

Asset	Type	Level
Synthetic Monitoring	Topic Pack	L1

Tempo (traces, distributed-tracing, spans) → full page¶

Asset	Type	Level
Tempo Flashcards	flashcard_deck	L1
Observability Architecture	Reference	L2
Observability Deep Dive	Topic Pack	L2
Runbook: Tempo No Traces	Runbook	L2
Skillcheck: Observability	Assessment	L2
Track: Observability	Reference	L2

Tracing (distributed-tracing-concepts, trace-propagation, span) → full page¶

Asset	Type	Level
Tracing	Topic Pack	L1
Tracing Flashcards	flashcard_deck	L1
strace	Topic Pack	L1
OpenTelemetry	Topic Pack	L2
perf Profiling	Topic Pack	L2

Security¶

Audit Logging (auditd, audit-trail, security-logging) → full page¶

Asset	Type	Level
Audit Logging	Topic Pack	L1
Audit Logging Flashcards	flashcard_deck	L1
Compliance & Audit Automation	Topic Pack	L2
Infrastructure Forensics	Topic Pack	L2
Runbook: Unauthorized Access Investigation	Runbook	L2
SELinux & Linux Hardening	Topic Pack	L2

Backup & Restore (backup-recovery, disaster-recovery-drill, restore-test, backup) → full page¶

Asset	Type	Level
Backup Restore	Topic Pack	L1
Backup Restore Flashcards	flashcard_deck	L1
Disaster Recovery & Backup Engineering	Topic Pack	L2

Compliance & Audit (openscap, inspec, stig, cis-cat) → full page¶

Asset	Type	Level
Compliance Flashcards	flashcard_deck	L1
Compliance & Audit Automation	Topic Pack	L2
SELinux & Linux Hardening	Topic Pack	L2

Container Image Scanning (alias → container_images) (trivy, grype, syft, snyk)¶

Asset	Type	Level
Container Images	Topic Pack	L1

Disaster Recovery (dr-plan, rto, rpo, failover)¶

Asset	Type	Level
Disaster Recovery Flashcards	flashcard_deck	L1
Disaster Recovery & Backup Engineering	Topic Pack	L2

HashiCorp Vault (vault, vault-secrets, vault-pki, vault-transit)¶

Asset	Type	Level
HashiCorp Vault	Topic Pack	L2

Incident Triage (triage, incident-assessment, severity-classification) → full page¶

Asset	Type	Level
Incident Triage	Topic Pack	L1
Incident Triage Flashcards	flashcard_deck	L1
Runbook: CVE Response (Critical Vulnerability)	Runbook	L2
Runbook: Unauthorized Access Investigation	Runbook	L2

Infrastructure Forensics (post-breach, rootkit-detection, evidence-preservation, log-forensics)¶

Asset	Type	Level
Infrastructure Forensics	Topic Pack	L2

LDAP & Identity Management (ldap, freeipa, active-directory, sssd)¶

Asset	Type	Level
LDAP Flashcards	flashcard_deck	L1
LDAP & Identity Management	Topic Pack	L2

Least Privilege (principle-of-least-privilege, access-control, permissions-audit)¶

Asset	Type	Level
LDAP & Identity Management	Topic Pack	L2

Offensive Security Basics (pentesting, red-team, offensive-security, ethical-hacking)¶

Asset	Type	Level
Offensive Security Basics	Topic Pack	L1

OpSec Mistakes (operational-security, opsec, common-mistakes)¶

Asset	Type	Level
Opsec Mistakes	Topic Pack	L1

Open Policy Agent (opa, rego, gatekeeper, opa-gatekeeper)¶

Asset	Type	Level
Open Policy Agent Flashcards	flashcard_deck	L1
Open Policy Agent	Topic Pack	L2

Runtime Security with Falco (falco, falcosidekick, runtime-security, kernel-security)¶

Asset	Type	Level
Runtime Security with Falco	Topic Pack	L2

SELinux & AppArmor (selinux, apparmor, mac, mandatory-access-control) → full page¶

Asset	Type	Level
Selinux Flashcards	flashcard_deck	L1
RHCE (EX294) Exam Preparation	Topic Pack	L2
SELinux & AppArmor	Topic Pack	L2

Secrets Management (sealed-secrets, external-secrets, sops) → full page¶

Asset	Type	Level
Secrets Management Flashcards	flashcard_deck	L1
HashiCorp Vault	Topic Pack	L2
Interview: Secret Leaked to Git	Scenario	L2
Interview: Vault Token Expired	Scenario	L2
Runbook: Credential Rotation (Exposed Secret)	Runbook	L2
Runbook: Secret Rotation	Runbook	L2
Secrets Management	Topic Pack	L2
Secrets Management Drills	Drill	L2
Skillcheck: Secrets Management	Assessment	L2

Security Scanning (trivy, vulnerability-scan, security, cyber-security) → full page¶

Asset	Type	Level
Lab: Trivy Scan Remediation (CLI)	Lab	L1
Security Basics (Ops-Focused)	Topic Pack	L1
Security Flashcards	flashcard_deck	L1
Security Scanning	Topic Pack	L1
Interview: CI Vuln Scan Failed	Scenario	L2
Runbook: CVE Response (Critical Vulnerability)	Runbook	L2
Security Drills	Drill	L2
Skillcheck: Security (Expanded)	Assessment	L2

Supply Chain Security (sbom, sigstore, cosign, slsa)¶

Asset	Type	Level
Supply Chain Security	Topic Pack	L2

TLS & Certificates Ops (tls-ops, certificates, x509, openssl)¶

Asset	Type	Level
TLS & Certificates Ops	Topic Pack	L1

TLS & PKI (pki, certificates, x509, ca-chain) → full page¶

Asset	Type	Level
HTTP Protocol	Topic Pack	L0
Case Study: SSL Cert Chain Incomplete	Case Study	L1
Networking Deep Dive	Topic Pack	L1
Nginx & Web Servers	Topic Pack	L1
TLS & Certificates Ops	Topic Pack	L1
TLS Flashcards	flashcard_deck	L1
Case Study: BMC Clock Skew Cert Failure	Case Study	L2
Case Study: DNS Looks Broken — TLS Expired, Fix Is Cert-Manager	Case Study	L2
Case Study: Deployment Stuck — ImagePull Auth Failure, Vault Secret Rotation	Case Study	L2
Case Study: User Auth Failing — OIDC Cert Expired, Cloud KMS Rotation	Case Study	L2
Deep Dive: TLS Handshake	Deep Dive	L2
Interview: Certificate Expired	Scenario	L2
Ops Archaeology: The Certificate That Works Sometimes	Case Study	L2
Runbook: Certificate Renewal Failed	Runbook	L2
Runbook: TLS Certificate Expiry	Runbook	L2
Scenario: DNS Looks Fine but App Fails	Scenario	L2
Skillcheck: TLS & PKI	Assessment	L2
TLS & PKI Drills	Drill	L2

Cloud¶

AWS CloudWatch (cloudwatch, cw-logs, cw-metrics, cw-alarms)¶

Asset	Type	Level
AWS CloudWatch	Topic Pack	L2

AWS EC2 (ec2, instances, ami, ebs)¶

Asset	Type	Level
AWS Compute Flashcards	flashcard_deck	L1
AWS EC2	Topic Pack	L1

AWS ECS (ecs, fargate, task-definition, ecs-service)¶

Asset	Type	Level
AWS ECS	Topic Pack	L2

AWS IAM (iam, aws-iam, iam-roles, iam-policies)¶

Asset	Type	Level
AWS IAM	Topic Pack	L1
AWS Security Flashcards	flashcard_deck	L1

AWS Lambda (lambda, serverless, cold-start, event-driven)¶

Asset	Type	Level
AWS Lambda	Topic Pack	L2

AWS Networking (vpc, aws-vpc, security-groups, nacl)¶

Asset	Type	Level
AWS Networking	Topic Pack	L1
AWS Networking Flashcards	flashcard_deck	L1

AWS Route 53 (route53, dns-aws, hosted-zone, alias-record)¶

Asset	Type	Level
AWS Route 53	Topic Pack	L2

AWS S3 Deep Dive (s3, buckets, objects, lifecycle)¶

Asset	Type	Level
AWS S3 Deep Dive	Topic Pack	L1
AWS Storage Flashcards	flashcard_deck	L1

AWS Troubleshooting (aws-debug, aws-issues, aws-ops)¶

Asset	Type	Level
AWS Troubleshooting	Topic Pack	L1
AWS Troubleshooting Flashcards	flashcard_deck	L1

Azure Troubleshooting (azure-debug, azure-issues, azure-ops)¶

Asset	Type	Level
Azure Troubleshooting	Topic Pack	L1
Azure Troubleshooting Flashcards	flashcard_deck	L1

Cloud Deep Dive (multi-cloud, iam, vpc, aws) → full page¶

Asset	Type	Level
AWS Devops Flashcards	flashcard_deck	L1
AWS EC2	Topic Pack	L1
AWS General Flashcards	flashcard_deck	L1
AWS IAM	Topic Pack	L1
AWS Networking	Topic Pack	L1
AWS S3 Deep Dive	Topic Pack	L1
Azure Flashcards	flashcard_deck	L1
Cloud Flashcards	flashcard_deck	L1
Cloud Ops Drills	Drill	L1
Skillcheck: Cloud Providers	Assessment	L1
AWS CloudWatch	Topic Pack	L2
AWS ECS	Topic Pack	L2
AWS Lambda	Topic Pack	L2
AWS Route 53	Topic Pack	L2
Cloud Deep Dive	Topic Pack	L2
Cloud Deep Dive Drills	Drill	L2
Runbook: Cloud Capacity Limit Hit	Runbook	L2
Runbook: VPC IP Exhaustion	Runbook	L2

GCP Troubleshooting (gcp-debug, gcp-issues, gcp-ops) → full page¶

Asset	Type	Level
GCP Compute Flashcards	flashcard_deck	L1
GCP General Flashcards	flashcard_deck	L1
GCP Kubernetes Flashcards	flashcard_deck	L1
GCP Networking Flashcards	flashcard_deck	L1
GCP Security Flashcards	flashcard_deck	L1
GCP Troubleshooting	Topic Pack	L1
GCP Troubleshooting Flashcards	flashcard_deck	L1

Serverless Computing (faas, function-as-a-service, scale-to-zero, cloud-functions)¶

Asset	Type	Level
Serverless Computing	Topic Pack	L2

Other¶

mergerfs (merger-fs, fuse-union, trapexit, union-filesystem)¶

Asset	Type	Level
Mergerfs Flashcards	flashcard_deck	L1
mergerfs	Topic Pack	L2