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Level-First Index

Browse all learning content by difficulty level, across all domains. Level definitions: L0 (Entry), L1 (Foundations), L2 (Operations), L3 (Advanced).

L0: Entry

First exposure. Can follow instructions with docs open.

Linux

Asset Type Time Status
Bash Exercises (Quest Ladder) (CLI) Exercise Set 8h solid
Linux Ops Topic Pack 5h solid
Linux Ops Drills Drill 30m solid
Skillcheck: Bash Assessment 30m solid
Skillcheck: Linux Fundamentals Assessment 30m solid
Track: Foundations Reference 20h solid

Networking

Asset Type Time Status
HTTP Protocol Topic Pack 3h solid

Kubernetes

Asset Type Time Status
Docker Exercises (Quest Ladder) (CLI) Exercise Set 8h solid
K8s Ecosystem Topic Pack 6h solid
Kubernetes Concept Chain Topic Pack 2h solid
Skillcheck: Docker Assessment 30m solid
Track: Containers Reference 10h solid

DevOps & Tooling

Asset Type Time Status
Ansible Lab: Facts and Variables Lab 20m solid
Ansible Lab: Ping and Debug Lab 15m solid
Break/Fix: Wrong Module Parameter Scenario 10m solid
Break/Fix: YAML Indentation Error Scenario 10m solid
CSS Fundamentals Topic Pack 2h solid
Career Engineering for Ops People Topic Pack 4h solid
Corporate IT Fluency for Engineers Topic Pack 3h solid
DevOps Learning Roadmap Reference 15m solid
Git Drills Drill 30m solid
Git for DevOps Topic Pack 3h solid
Homelab & Learning Infrastructure Topic Pack 5h solid
Mental Models (Core Concepts) Topic Pack 4h solid
Mental Models (Core) Flashcards flashcard_deck - solid
Mental-Model-First Learning Guide Reference 30m solid
Python Drills Drill 30m solid
Python Exercises (Quest Ladder) (CLI) Exercise Set 8h solid
SQL Fundamentals Topic Pack 2h solid
Skillcheck: Git Assessment 30m solid
Skillcheck: Python Automation Assessment 30m solid
Topic Tag Cloud & Content Index Reference 10m solid
VS Code for DevOps Topic Pack 3h solid

CLI Tools

Asset Type Time Status
Modern CLI Drills Drill 30m solid
Modern CLI Tools Topic Pack 3h solid
Skillcheck: Modern CLI Tools Assessment 30m solid

L1: Foundations

Can work independently on standard tasks. Occasional doc lookups.

Linux

Asset Type Time Status
Advanced Bash for Ops Topic Pack 5h solid
Bash Flashcards flashcard_deck - solid
Binary Flashcards flashcard_deck - solid
Binary and Floats Topic Pack 2h solid
Case Study: Inode Exhaustion Case Study 30m solid
Case Study: Runaway Logs Fill Disk Case Study 30m solid
Case Study: SELinux Denying Service Case Study 30m solid
Case Study: Systemd Service Flapping Case Study 30m solid
Case Study: Zombie Processes Accumulating Case Study 30m solid
Cron & Job Scheduling Topic Pack 4h solid
Cron Flashcards flashcard_deck - solid
DNF Flashcards flashcard_deck - solid
Debian & Ubuntu Ecosystem Topic Pack 6h solid
Debian Ubuntu Flashcards flashcard_deck - solid
Disk & Storage Ops Topic Pack 5h solid
Environment Variables Topic Pack 2h solid
Inodes Topic Pack 2h solid
Inodes Flashcards flashcard_deck - solid
Interview: Linux Server Slow Scenario 15m solid
LPIC/LFCS Flashcards flashcard_deck - solid
Linux Boot Process Topic Pack 3h solid
Linux Data Hoarding Flashcards flashcard_deck - solid
Linux Distribution Comparison Topic Pack 4h solid
Linux Distros Flashcards flashcard_deck - solid
Linux Filesystem Flashcards flashcard_deck - solid
Linux Fundamentals Flashcards flashcard_deck - solid
Linux Kernel Flashcards flashcard_deck - solid
Linux Logging Topic Pack 4h solid
Linux Memory Flashcards flashcard_deck - solid
Linux Memory Management Topic Pack 4h solid
Linux Ops Storage Topic Pack 2h solid
Linux Ops Systemd Topic Pack 2h solid
Linux Performance Flashcards flashcard_deck - solid
Linux Processes Flashcards flashcard_deck - solid
Linux Security Flashcards flashcard_deck - solid
Linux Signals & Process Control Topic Pack 3h solid
Linux Systemd Flashcards flashcard_deck - solid
Linux Text Processing Topic Pack 3h solid
Linux Users & Permissions Topic Pack 4h solid
Mounts Filesystems Topic Pack 2h solid
Package Management Topic Pack 2h solid
Package Management Flashcards flashcard_deck - solid
Performance Flashcards flashcard_deck - solid
Pipes & Redirection Topic Pack 3h solid
Process Management Topic Pack 4h solid
Runbook: Disk Full Runbook 15m solid
Runbook: High CPU (Runaway Process) Runbook 15m solid
Runbook: OOM Killer Activated Runbook 15m solid
Runbook: Systemd Service Crash Loop Runbook 15m solid
SSH Deep Dive Topic Pack 4h solid
Strace Flashcards flashcard_deck - solid
Terminal Flashcards flashcard_deck - solid
Terminal Internals Topic Pack 2h solid
Tracing Flashcards flashcard_deck - solid
eBPF Flashcards flashcard_deck - solid
iptables & nftables Topic Pack 4h solid
rsync Topic Pack 3h solid
strace Topic Pack 2h solid
systemctl & journalctl Deep Dive Topic Pack 4h solid
tar & Compression Topic Pack 2h solid
tmux & screen Topic Pack 2h solid

Networking

Asset Type Time Status
ARP Topic Pack 2h solid
ARP Flashcards flashcard_deck - solid
Case Study: DHCP Relay Broken Case Study 30m solid
Case Study: DNS Resolution Slow Case Study 30m solid
Case Study: Duplex Mismatch Symptoms Case Study 30m solid
Case Study: SSL Cert Chain Incomplete Case Study 30m solid
Case Study: VLAN Trunk Mistag Case Study 30m solid
Cisco Flashcards flashcard_deck - solid
Cisco Fundamentals for DevOps Topic Pack 4h solid
DHCP & IP Address Management Topic Pack 4h solid
DHCP Flashcards flashcard_deck - solid
DNS Deep Dive Topic Pack 4h solid
DNS Flashcards flashcard_deck - solid
Dnssec Flashcards flashcard_deck - solid
Email Infrastructure Topic Pack 3h solid
Firewalls Topic Pack 2h solid
Firewalls Flashcards flashcard_deck - solid
LACP Topic Pack 2h solid
LACP Flashcards flashcard_deck - solid
Linux Networking Flashcards flashcard_deck - solid
Load Balancing Flashcards flashcard_deck - solid
MTU Topic Pack 2h solid
MTU Flashcards flashcard_deck - solid
Mellanox Switches Flashcards flashcard_deck - solid
NAT Topic Pack 2h solid
NAT Flashcards flashcard_deck - solid
Networking Deep Dive Topic Pack 6h solid
Networking Drills Drill 30m solid
Networking Flashcards flashcard_deck - solid
Networking Troubleshooting Topic Pack 5h solid
Packet Path Flashcards flashcard_deck - solid
Routing Topic Pack 2h solid
Routing Flashcards flashcard_deck - solid
Runbook: DNS Resolution Failure Runbook 15m solid
STP (Spanning Tree) Topic Pack 2h solid
STP Flashcards flashcard_deck - solid
Scenario: Duplex Mismatch Scenario 20m solid
Skillcheck: Networking Fundamentals Assessment 30m solid
Subnetting & IP Addressing Topic Pack 2h solid
TLS Flashcards flashcard_deck - solid
Tcpdump Flashcards flashcard_deck - solid
VLANs Topic Pack 2h solid
VPN Flashcards flashcard_deck - solid
Vlans Flashcards flashcard_deck - solid

Datacenter & Hardware

Asset Type Time Status
Case Study: BIOS Settings Reset After CMOS Case Study 30m solid
Case Study: Bonding Failover Not Working Case Study 30m solid
Case Study: Cable Management Wrong Port Case Study 30m solid
Case Study: Disk Full Root Services Down Case Study 30m solid
Case Study: Link Flaps Bad Optic Case Study 30m solid
Case Study: Memory ECC Errors Increasing Case Study 30m solid
Case Study: PXE Boot Fails UEFI Mismatch Case Study 30m solid
Case Study: Power Supply Redundancy Lost Case Study 30m solid
Case Study: Rack PDU Overload Alert Case Study 30m solid
Case Study: Serial Console Garbled Case Study 30m solid
Case Study: Server Remote Console Lag Case Study 30m solid
Case Study: Thermal Throttle Fan Failure Case Study 30m solid
Case Study: iDRAC Unreachable OS Up Case Study 30m solid
Datacenter & Server Hardware Topic Pack 6h solid
Datacenter Drills Drill 30m solid
Datacenter Flashcards flashcard_deck - solid
Dell PowerEdge Servers Topic Pack 2h solid
Firmware Topic Pack 2h solid
Firmware Flashcards flashcard_deck - solid
IPMI and ipmitool Topic Pack 3h solid
Packer Topic Pack 2h solid
Power Topic Pack 2h solid
Redfish API Topic Pack 2h solid
Scenario: RAID Array Degraded Scenario 20m solid
Scenario: Server Won't Boot After Update Scenario 20m solid
Scenario: Thermal Throttling Scenario 20m solid
Server Hardware Topic Pack 2h solid
Server Hardware Flashcards flashcard_deck - solid
Skillcheck: Datacenter Assessment 30m solid
Storage Flashcards flashcard_deck - solid
VMware Flashcards flashcard_deck - solid
Virtualization Flashcards flashcard_deck - solid

Kubernetes

Asset Type Time Status
Api Gateway Flashcards flashcard_deck - solid
Case Study: CrashLoopBackOff No Logs Case Study 30m solid
Case Study: ImagePullBackOff Registry Auth Case Study 30m solid
Case Study: Service No Endpoints Case Study 30m solid
Cilium Flashcards flashcard_deck - solid
Consul Flashcards flashcard_deck - solid
Container Base Images Flashcards flashcard_deck - solid
Container Images Topic Pack 3h solid
Container Runtime Flashcards flashcard_deck - solid
CrashLoopBackOff Topic Pack 2h solid
Crashloopbackoff Flashcards flashcard_deck - solid
Database Operations Flashcards flashcard_deck - solid
Docker Topic Pack 2h solid
Docker Drills Drill 30m solid
Envoy Flashcards flashcard_deck - solid
Helm Topic Pack 2h solid
Interview: Docker Container Debugging Scenario 15m solid
Istio Flashcards flashcard_deck - solid
K8s Networking Topic Pack 2h solid
K8s RBAC Topic Pack 2h solid
K8s Storage Topic Pack 2h solid
Kubernetes Advanced Operations Flashcards flashcard_deck - solid
Kubernetes Concept Chain Flashcards flashcard_deck - solid
Kubernetes Config Flashcards flashcard_deck - solid
Kubernetes Core Flashcards flashcard_deck - solid
Kubernetes Exercises (Quest Ladder) (CLI) Exercise Set 10h solid
Kubernetes General Flashcards flashcard_deck - solid
Kubernetes Networking Flashcards flashcard_deck - solid
Kubernetes Node Lifecycle Flashcards flashcard_deck - solid
Kubernetes Operations Flashcards flashcard_deck - solid
Kubernetes Operators Flashcards flashcard_deck - solid
Kubernetes Pods & Scheduling Topic Pack 4h solid
Kubernetes RBAC Flashcards flashcard_deck - solid
Kubernetes Security Flashcards flashcard_deck - solid
Kubernetes Services & Ingress Topic Pack 4h solid
Kubernetes Services Flashcards flashcard_deck - solid
Kubernetes Storage Flashcards flashcard_deck - solid
Kubernetes Troubleshooting Flashcards flashcard_deck - solid
Kubernetes Workloads Flashcards flashcard_deck - solid
Kustomize Topic Pack 3h solid
Lab: HPA Live Scaling (CLI) Lab 30m solid
Lab: Readiness Probe Failure (CLI) Lab 30m solid
Lab: Resource Limits OOMKilled (CLI) Lab 30m solid
Multi Tenancy Flashcards flashcard_deck - solid
Node Maintenance Topic Pack 2h solid
OOMKilled Topic Pack 2h solid
Oomkilled Flashcards flashcard_deck - solid
Openshift Flashcards flashcard_deck - solid
Policy Engines Flashcards flashcard_deck - solid
Runbook: Deployment Stuck / Rollout Stalled Runbook 15m solid
Runbook: ImagePullBackOff Runbook 15m solid
Runbook: Ingress 404 Runbook 15m solid
Runbook: Node NotReady Runbook 15m solid
Runbook: OOMKilled Container Runbook 15m solid
Runbook: PVC Stuck in Pending Runbook 15m solid
Runbook: Pod CrashLoopBackOff Runbook 15m solid
Runbook: Readiness Probe Failed Runbook 15m solid
Service Mesh Flashcards flashcard_deck - solid
Skillcheck: Kubernetes Assessment 45m solid
Track: Kubernetes Core Reference 15h solid
cert-manager Topic Pack 3h solid
etcd Topic Pack 2h solid
etcd Flashcards flashcard_deck - solid
kubectl Debugging Cheatsheet Reference 15m solid
kubectl Drills Drill 45m solid

DevOps & Tooling

Asset Type Time Status
AI Tools for DevOps Topic Pack 4h solid
AI-Assisted DevOps Cookbook Reference 2h solid
Ansible Automation Topic Pack 5h solid
Ansible Core Flashcards flashcard_deck - solid
Ansible Drills Drill 30m solid
Ansible Exercises (Quest Ladder) (CLI) Exercise Set 8h solid
Ansible Lab: Conditionals and Loops Lab 25m solid
Ansible Lab: Install Nginx (Idempotency) Lab 20m solid
Ansible Lab: Roles Lab 20m solid
Ansible Lab: Templates and Handlers Lab 25m solid
Ansible Operations Flashcards flashcard_deck - solid
Ansible Playbooks Flashcards flashcard_deck - solid
Argo Flashcards flashcard_deck - solid
Automation Topic Pack 1h stub
Break/Fix: Handler Name Mismatch Scenario 10m solid
Break/Fix: Jinja2 Syntax Error in Template Scenario 15m solid
Break/Fix: Privilege Escalation Missing Scenario 10m solid
Break/Fix: Task Ordering / Dependency Scenario 15m solid
Break/Fix: Undefined Variable + Bare Jinja2 Scenario 15m solid
Break/Fix: Wrong Host Scope Scenario 10m solid
CI Pipeline Documentation Reference 15m solid
CI/CD Drills Drill 30m solid
CI/CD Flashcards flashcard_deck - solid
CI/CD Pipelines & Patterns Topic Pack 8h solid
CSS Flashcards flashcard_deck - solid
Capacity Planning Flashcards flashcard_deck - solid
Change Management Topic Pack 4h solid
Change Management Flashcards flashcard_deck - solid
Chaos Engineering Flashcards flashcard_deck - solid
Chef Flashcards flashcard_deck - solid
Circleci Flashcards flashcard_deck - solid
Claude Code Topic Pack 2h solid
Claude Code Flashcards flashcard_deck - solid
Cloud Ops Basics Topic Pack 4h solid
Compliance Flashcards flashcard_deck - solid
Configuration Management Topic Pack 1h stub
Containers Deep Dive Topic Pack 5h solid
Corporate It Fluency Flashcards flashcard_deck - solid
DORA Metrics & DevEx Topic Pack 3h solid
Database Internals Topic Pack 2h solid
Database Internals Flashcards flashcard_deck - solid
Databases Flashcards flashcard_deck - solid
Datascience Flashcards flashcard_deck - solid
Debugging Methodology Topic Pack 4h solid
Debugging Methodology Flashcards flashcard_deck - solid
Deployments Topic Pack 1h stub
Devops Flashcards flashcard_deck - solid
Edge IoT Flashcards flashcard_deck - solid
Elasticsearch Topic Pack 2h solid
Elasticsearch Flashcards flashcard_deck - solid
Feature Flags Topic Pack 3h solid
Finops Flashcards flashcard_deck - solid
Fleet Operations Flashcards flashcard_deck - solid
Generativeai Flashcards flashcard_deck - solid
Git Flashcards flashcard_deck - solid
Git Workflows Flashcards flashcard_deck - solid
GitHub Actions Topic Pack 4h solid
GitOps Topic Pack 2h solid
Gitops Flashcards flashcard_deck - solid
Graphql Flashcards flashcard_deck - solid
Grokdevops Training Flashcards flashcard_deck - solid
HTTP Protocol Flashcards flashcard_deck - solid
Helm Drills Drill 30m solid
Helm Flashcards flashcard_deck - solid
Homelab Flashcards flashcard_deck - solid
Incident Psychology Flashcards flashcard_deck - solid
Incident Response Flashcards flashcard_deck - solid
Incident Triage Topic Pack 2h solid
Jenkins Flashcards flashcard_deck - solid
Kafka Topic Pack 2h solid
Kafka Flashcards flashcard_deck - solid
Lab: Helm Upgrade Rollback (CLI) Lab 30m solid
Legacy System Archaeology Topic Pack 4h solid
Legacy Systems Flashcards flashcard_deck - solid
Load Testing Topic Pack 3h solid
MLOps Flashcards flashcard_deck - solid
Make & Build Systems Topic Pack 3h solid
Mergerfs Flashcards flashcard_deck - solid
Message Queues Flashcards flashcard_deck - solid
MongoDB Operations Topic Pack 4h solid
MySQL / MariaDB Operations Topic Pack 4h solid
NGINX Flashcards flashcard_deck - solid
Nginx & Web Servers Topic Pack 5h solid
Observability Flashcards flashcard_deck - solid
On Call Flashcards flashcard_deck - solid
Operations War Stories Flashcards flashcard_deck - solid
Ops Archaeology: The Container That Exits Immediately Case Study 30m solid
Ops Archaeology: The Deploy That Didn't Deploy Case Study 30m solid
Ops Archaeology: The Gateway That Returns 502 Case Study 30m solid
Ops Archaeology: The Pods That Won't Schedule Case Study 30m solid
Ops Archaeology: The Service That Won't Start Case Study 30m solid
Perl Flashcards flashcard_deck - solid
Platform Engineering Flashcards flashcard_deck - solid
Postmortem SLO Flashcards flashcard_deck - solid
PowerShell Topic Pack 2h solid
Prometheus Stack Flashcards flashcard_deck - solid
Puppet Flashcards flashcard_deck - solid
Python Debugging Topic Pack 3h solid
Python Flashcards flashcard_deck - solid
Python for Infrastructure Topic Pack 5h solid
RHCE Flashcards flashcard_deck - solid
Repository Flashcards flashcard_deck - solid
Runbook Craft Topic Pack 4h solid
Runbook Craft Flashcards flashcard_deck - solid
Runbook: Ansible Playbook Failure Runbook 15m solid
Runbook: Build Failure Triage Runbook 15m solid
Runbook: Container Registry Pull Failure Runbook 15m solid
Runbook: Deploy Rollback Runbook 15m solid
Runbook: Helm Upgrade Failed Runbook 15m solid
Runbook: Pipeline Stuck / Hung Job Runbook 15m solid
S3-Compatible Object Storage Topic Pack 3h solid
SQL Flashcards flashcard_deck - solid
SSH Hygiene Flashcards flashcard_deck - solid
Saltstack Flashcards flashcard_deck - solid
Skillcheck: Ansible Assessment 30m solid
Skillcheck: CI/CD Assessment 30m solid
Skillcheck: Cloud Basics Assessment 30m solid
Skillcheck: DevOps Roadmap (Expanded) Assessment 45m solid
Skillcheck: Helm & Release Ops Assessment 30m solid
Skillcheck: Terraform / IaC Assessment 30m solid
Software Development Flashcards flashcard_deck - solid
Systems Thinking Flashcards flashcard_deck - solid
Systems Thinking for Engineers Topic Pack 4h solid
Terraform / IaC Topic Pack 5h solid
Terraform Basics Flashcards flashcard_deck - solid
Terraform Drills Drill 30m solid
Terraform Modules Flashcards flashcard_deck - solid
Terraform Providers Flashcards flashcard_deck - solid
Terraform State Flashcards flashcard_deck - solid
Terraform Workflow Flashcards flashcard_deck - solid
Track: Helm & Release Ops Reference 8h solid
Track: Infrastructure Reference 12h solid
VS Code Flashcards flashcard_deck - solid
Vendor Management & Escalation Topic Pack 3h solid
Vendor Management Flashcards flashcard_deck - solid
Zuul Flashcards flashcard_deck - solid

CLI Tools

Asset Type Time Status
CLI Tools Flashcards flashcard_deck - solid
Modern CLI Flashcards flashcard_deck - solid
Modern Cli Workflows Topic Pack 1h solid
Regex & Text Wrangling Topic Pack 5h solid
Regular Expressions Flashcards flashcard_deck - solid
Ripgrep Flashcards flashcard_deck - solid
YAML, JSON & Config Formats Topic Pack 3h solid
awk: The Record/Field Processor Topic Pack 2h solid
curl & wget Topic Pack 3h solid
fd Topic Pack 2h solid
fd Flashcards flashcard_deck - solid
find Topic Pack 3h solid
fzf Topic Pack 2h solid
fzf Flashcards flashcard_deck - solid
grep & Regular Expressions Topic Pack 4h solid
jq Topic Pack 2h solid
jq Flashcards flashcard_deck - solid
ripgrep Topic Pack 2h solid
sed: The Stream Editor Topic Pack 2h solid
xargs Topic Pack 3h solid

Observability

Asset Type Time Status
Alerting Flashcards flashcard_deck - solid
Datadog Flashcards flashcard_deck - solid
Grafana Flashcards flashcard_deck - solid
Log Pipelines Flashcards flashcard_deck - solid
Loki Flashcards flashcard_deck - solid
Monitoring Flashcards flashcard_deck - solid
Monitoring Fundamentals Topic Pack 5h solid
Runbook: Grafana Dashboard Blank / No Data Runbook 15m solid
Runbook: Prometheus Target Down Runbook 15m solid
Synthetic Monitoring Topic Pack 3h solid
Tempo Flashcards flashcard_deck - solid
Tracing Topic Pack 2h solid

Security

Asset Type Time Status
Audit Logging Topic Pack 2h solid
Audit Logging Flashcards flashcard_deck - solid
Backup Restore Topic Pack 2h solid
Backup Restore Flashcards flashcard_deck - solid
Disaster Recovery Flashcards flashcard_deck - solid
Incident Triage Flashcards flashcard_deck - solid
LDAP Flashcards flashcard_deck - solid
Lab: Trivy Scan Remediation (CLI) Lab 30m solid
Offensive Security Basics Topic Pack 2h solid
Open Policy Agent Flashcards flashcard_deck - solid
Opsec Mistakes Topic Pack 2h solid
Secrets Management Flashcards flashcard_deck - solid
Security Basics (Ops-Focused) Topic Pack 4h solid
Security Flashcards flashcard_deck - solid
Security Scanning Topic Pack 2h solid
Selinux Flashcards flashcard_deck - solid
TLS & Certificates Ops Topic Pack 6h solid

Cloud

Asset Type Time Status
AWS Compute Flashcards flashcard_deck - solid
AWS Database Flashcards flashcard_deck - solid
AWS Devops Flashcards flashcard_deck - solid
AWS EC2 Topic Pack 4h solid
AWS General Flashcards flashcard_deck - solid
AWS IAM Topic Pack 4h solid
AWS Networking Topic Pack 4h solid
AWS Networking Flashcards flashcard_deck - solid
AWS S3 Deep Dive Topic Pack 4h solid
AWS Security Flashcards flashcard_deck - solid
AWS Storage Flashcards flashcard_deck - solid
AWS Troubleshooting Topic Pack 2h solid
AWS Troubleshooting Flashcards flashcard_deck - solid
Azure Flashcards flashcard_deck - solid
Azure Troubleshooting Topic Pack 2h solid
Azure Troubleshooting Flashcards flashcard_deck - solid
Cloud Flashcards flashcard_deck - solid
Cloud Ops Drills Drill 30m solid
GCP Compute Flashcards flashcard_deck - solid
GCP General Flashcards flashcard_deck - solid
GCP Kubernetes Flashcards flashcard_deck - solid
GCP Networking Flashcards flashcard_deck - solid
GCP Security Flashcards flashcard_deck - solid
GCP Troubleshooting Topic Pack 2h solid
GCP Troubleshooting Flashcards flashcard_deck - solid
Skillcheck: Cloud Providers Assessment 30m solid

Containers

Asset Type Time Status
Docker Basics Flashcards flashcard_deck - solid
Docker Networking Flashcards flashcard_deck - solid
Docker Operations Flashcards flashcard_deck - solid
Docker Security Flashcards flashcard_deck - solid
Docker Storage Flashcards flashcard_deck - solid

L2: Operations

Can operate systems in production. Handles incidents.

Linux

Asset Type Time Status
/proc Filesystem Topic Pack 3h solid
Case Study: IPTables Blocking Unexpected Case Study 30m solid
Case Study: Kernel Soft Lockup Case Study 30m solid
Case Study: OOM Killer Events Case Study 30m solid
Case Study: Stuck NFS Mount Case Study 30m solid
Case Study: Time Sync Skew Breaks App Case Study 30m solid
DNF Package Manager Topic Pack 3h solid
Deep Dive: Linux Boot Sequence Deep Dive 45m solid
Deep Dive: Linux Filesystem Internals Deep Dive 45m solid
Deep Dive: Linux Memory Management Deep Dive 45m solid
Deep Dive: Linux Network Packet Flow Deep Dive 45m solid
Deep Dive: Linux Performance Debugging Deep Dive 45m solid
Deep Dive: Systemd Architecture Deep Dive 45m solid
Deep Dive: Systemd Service Design Debugging and Hardening Deep Dive 45m solid
Deep Dive: Systemd Timers Journald Cgroups and Resource Control Deep Dive 45m solid
Deep Dive: Systemd Units Dependencies and Ordering Deep Dive 45m solid
LPIC / LFCS Exam Preparation Topic Pack 30h solid
Linux Data Hoarding Topic Pack 4h solid
Linux Kernel Tuning Topic Pack 4h solid
Linux Performance Tuning Topic Pack 7h solid
Runbook: Zombie Processes Accumulating Runbook 15m solid
cgroups & Linux Namespaces Topic Pack 4h solid
mergerfs Topic Pack 3h solid
perf Profiling Topic Pack 2h solid

Networking

Asset Type Time Status
BGP EVPN / VXLAN Topic Pack 5h solid
Case Study: ARP Flux Duplicate IP Case Study 30m solid
Case Study: Asymmetric Routing One Direction Case Study 30m solid
Case Study: BGP Peer Flapping Case Study 30m solid
Case Study: DNS Split Horizon Confusion Case Study 30m solid
Case Study: Firewall Shadow Rule Case Study 30m solid
Case Study: Jumbo Frames Partial Case Study 30m solid
Case Study: LACP Mismatch One Link Hot Case Study 30m solid
Case Study: MTU Blackhole TLS Stalls Case Study 30m solid
Case Study: Multicast Not Crossing Router Case Study 30m solid
Case Study: NAT Exhaustion Intermittent Case Study 30m solid
Case Study: Network Loop Broadcast Storm Case Study 30m solid
Case Study: OSPF Stuck In Exstart Case Study 30m solid
Case Study: Proxy ARP Causing Issues Case Study 30m solid
Case Study: Source Routing Policy Miss Case Study 30m solid
Case Study: TCP RST After Idle Case Study 30m solid
DNS Operations Topic Pack 4h solid
DNSSEC & DNS Security Topic Pack 4h solid
Deep Dive: AWS VPC Internals Deep Dive 45m solid
Deep Dive: TCP/IP Deep Dive Deep Dive 45m solid
Deep Dive: TLS Handshake Deep Dive 45m solid
HAProxy & Nginx for Ops Topic Pack 4h solid
Mellanox Switches Topic Pack 4h solid
Network Automation Topic Pack 5h solid
Runbook: Load Balancer Health Check Failure Runbook 15m solid
Runbook: MTU Mismatch Runbook 15m solid
Runbook: Network Partition (Split Brain / Partial Connectivity) Runbook 20m solid
Runbook: TLS Certificate Expiry Runbook 15m solid
Scenario: Asymmetric Routing Scenario 20m solid
Scenario: DNS Looks Fine but App Fails Scenario 20m solid
Scenario: MTU Blackhole Scenario 20m solid
Scenario: VLAN Trunk Mismatch Scenario 20m solid
TCP/IP Deep Dive Topic Pack 5h solid
Tailscale & Zero Trust Networking Topic Pack 3h solid
VPN & Tunneling Topic Pack 5h solid
Wireshark & Packet Analysis Topic Pack 4h solid
gRPC & Protocol Buffers Topic Pack 3h solid

Datacenter & Hardware

Asset Type Time Status
Bare-Metal Provisioning Topic Pack 5h solid
Case Study: BMC Clock Skew Cert Failure Case Study 30m solid
Case Study: Firmware Update Boot Loop Case Study 30m solid
Case Study: HBA Firmware Mismatch Case Study 30m solid
Case Study: NVMe Drive Disappeared Case Study 30m solid
Case Study: OS Install Fails RAID Controller Case Study 30m solid
Case Study: RAID Degraded Rebuild Latency Case Study 30m solid
Case Study: Server Intermittent Reboot Case Study 30m solid
Deep Dive: Dell Linux PowerEdge Deep Dive 45m solid
Deep Dive: RAID and Storage Internals Deep Dive 45m solid
Interview: Server Won't POST Scenario 15m solid
Scenario: NIC Flapping / LACP Mismatch Scenario 20m solid
Scenario: OOB Unreachable but Host Responds Scenario 20m solid
Storage Operations Topic Pack 5h solid
VMware Topic Pack 4h solid
Virtualization Topic Pack 5h solid

Kubernetes

Asset Type Time Status
API Gateways & Ingress Topic Pack 5h solid
Argo Workflows Topic Pack 4h solid
Case Study: CNI Broken After Restart Case Study 30m solid
Case Study: CoreDNS Timeout Pod DNS Case Study 30m solid
Case Study: DaemonSet Blocks Eviction Case Study 30m solid
Case Study: Drain Blocked by PDB Case Study 30m solid
Case Study: Node Pressure Evictions Case Study 30m solid
Case Study: Persistent Volume Stuck Terminating Case Study 30m solid
Case Study: Resource Quota Blocking Deploy Case Study 30m solid
Chaos Engineering Scripts (CLI) Exercise Set 2h solid
Cilium & eBPF Networking Topic Pack 4h solid
Container Runtime Drills Drill 30m solid
Database Operations on Kubernetes Topic Pack 4h solid
Database Ops Drills Drill 30m solid
Deep Dive: Kubernetes Networking Deep Dive 45m solid
Deep Dive: Kubernetes Pod Lifecycle Deep Dive 45m solid
Envoy Proxy Topic Pack 4h solid
HashiCorp Consul Topic Pack 4h solid
Incident Simulator (18 scenarios) (CLI) Exercise Set 4h solid
Interview: Deployment Stuck Progressing Scenario 15m solid
Interview: HPA Not Scaling Scenario 15m solid
Interview: Ingress 404 Scenario 15m solid
Interview: Kyverno Blocking Deploys Scenario 15m solid
Interview: Pods OOMKilled Scenario 15m solid
Interview: RBAC Forbidden Scenario 15m solid
Investigation Engine (CLI) Exercise Set 2h solid
Istio Service Mesh Topic Pack 5h solid
Kubernetes Debugging Playbook Topic Pack 4h solid
Kubernetes Node Lifecycle Topic Pack 4h solid
Kubernetes Ops (Production) Topic Pack 5h solid
Multi-Tenancy Patterns Topic Pack 5h solid
Policy Engine Drills Drill 30m solid
Policy Engines (OPA / Kyverno) Topic Pack 4h solid
Progressive Delivery Topic Pack 4h solid
Runbook: Disaster Recovery Runbook 20m solid
Runbook: HPA Not Scaling Runbook 15m solid
Runbook: HPA Thrashing (Rapid Scale Up/Down) Runbook 15m solid
Runbook: Ingress 502 Bad Gateway Runbook 15m solid
Runbook: Kyverno Blocking Workloads Runbook 15m solid
Runbook: NetworkPolicy Block Runbook 15m solid
Runbook: Pod Eviction Runbook 15m solid
Runbook: RBAC Forbidden Runbook 15m solid
Runbook: Velero Backup & Restore Runbook 15m solid
Runbook: etcd Backup & Restore Runbook 20m solid
Skillcheck: Container Runtime Debug Assessment 30m solid
Skillcheck: Database Ops Assessment 30m solid
Skillcheck: Kubernetes Under the Covers Assessment 45m solid
Skillcheck: Policy Engines Assessment 30m solid
Skillcheck: etcd Assessment 30m solid
etcd Drills Drill 30m solid

DevOps & Tooling

Asset Type Time Status
Adversarial Interview Gauntlet (30 sequences) Scenario 15h solid
Ansible Deep Dive Topic Pack 5h solid
Ansible Lab: Vault (Secrets Management) Lab 25m solid
ArgoCD & GitOps Topic Pack 5h solid
Backstage & Developer Portals Topic Pack 3h solid
Capacity Planning Topic Pack 4h solid
Case Study: API Latency Spike — BGP Route Leak, Fix Is Network ACL Case Study 30m solid
Case Study: Alert Storm — Flapping Health Checks Case Study 30m solid
Case Study: Ansible Playbook Hangs — SSH Agent Forwarding Blocked by Firewall Case Study 30m solid
Case Study: Backup Job Failing — iSCSI Target Unreachable, VLAN Misconfigured Case Study 30m solid
Case Study: CI Pipeline Fails — Docker Layer Cache Corruption Case Study 30m solid
Case Study: Canary Deploy Routing to Wrong Backend — Ingress Misconfigured Case Study 30m solid
Case Study: Container Vuln Scanner False Positive Blocks Deploy Case Study 30m solid
Case Study: DNS Looks Broken — TLS Expired, Fix Is Cert-Manager Case Study 30m solid
Case Study: Database Replication Lag — Root Cause Is RAID Degradation Case Study 30m solid
Case Study: Deployment Stuck — ImagePull Auth Failure, Vault Secret Rotation Case Study 30m solid
Case Study: Disk Full — Runaway Logs, Fix Is Loki Retention Case Study 30m solid
Case Study: Grafana Dashboard Empty — Prometheus Blocked by NetworkPolicy Case Study 30m solid
Case Study: HPA Flapping — Metrics Server Clock Skew, Fix Is NTP Case Study 30m solid
Case Study: Job Queue Backlog — Worker Pod CPU Throttled by cgroup Case Study 30m solid
Case Study: Node NotReady — NIC Firmware Bug, Fix Is Ansible Playbook Case Study 30m solid
Case Study: Pod OOMKilled — Memory Leak in Sidecar, Fix Is Helm Values Case Study 30m solid
Case Study: SSH Timeout — MTU Mismatch, Fix Is Terraform Variable Case Study 30m solid
Case Study: Service Mesh 503s — Envoy Misconfigured, RBAC Policy Case Study 30m solid
Case Study: Terraform Apply Fails — State Lock Stuck, DynamoDB Throttle Case Study 30m solid
Case Study: User Auth Failing — OIDC Cert Expired, Cloud KMS Rotation Case Study 30m solid
Ceph Storage Topic Pack 5h solid
Certificates Topic Pack 1h stub
Chaos Engineering & Fault Injection Topic Pack 5h solid
Crossplane Topic Pack 3h solid
Dagger / CI as Code Topic Pack 2h solid
Data Modeling Topic Pack 1h stub
Databases Topic Pack 1h stub
Deep Dive: CI/CD Pipeline Architecture Deep Dive 45m solid
Deep Dive: Containers How They Really Work Deep Dive 45m solid
Deep Dive: Docker Image Internals Deep Dive 45m solid
Deep Dive: Terraform State Internals Deep Dive 45m solid
Distributed Systems Fundamentals Topic Pack 5h solid
Edge & IoT Infrastructure Topic Pack 4h solid
FinOps & Cost Optimization Topic Pack 4h solid
FinOps Drills Drill 30m solid
Fleet Operations at Scale Topic Pack 5h solid
Git Advanced Topic Pack 5h solid
Git Workflows & Branching Strategies Topic Pack 3h solid
GitOps & ArgoCD Drills Drill 30m solid
GraphQL Topic Pack 4h solid
Incident Command & On-Call Topic Pack 4h solid
Infrastructure Testing Topic Pack 4h solid
Interview: Config Drift Detected Scenario 15m solid
Interview: Cost Spike Investigation Scenario 15m solid
Interview: GitOps Drift Detected Scenario 15m solid
Interview: Helm Upgrade Broke Prod Scenario 15m solid
Lab: GitOps Sync and Drift (CLI) Lab 30m solid
Message Queues Topic Pack 5h solid
Nix / NixOS Topic Pack 4h solid
On-Call Topic Pack 1h stub
OpenTofu & Terraform Ecosystem Topic Pack 2h solid
Ops Archaeology: The 5% That Can't Resolve Case Study 30m solid
Ops Archaeology: The Alerts That Stopped Firing Case Study 30m solid
Ops Archaeology: The Certificate That Works Sometimes Case Study 30m solid
Ops Archaeology: The Cluster That Disagrees With Itself Case Study 30m solid
Ops Archaeology: The DR That Looks Ready But Isn't Case Study 30m solid
Ops Archaeology: The Job That Succeeded Wrong Case Study 30m solid
Ops Archaeology: The Replica That Fell Behind Case Study 30m solid
Ops Archaeology: The Requests That Vanish Case Study 30m solid
Ops Archaeology: The Session Store That Keeps Dying Case Study 30m solid
Ops Archaeology: The Slow Death Nobody Noticed Case Study 30m solid
Ops War Stories & Pattern Recognition Topic Pack 4h solid
Performance Topic Pack 1h stub
Platform Engineering Patterns Topic Pack 5h solid
PostgreSQL Operations Topic Pack 4h solid
Postmortem & SLO Drills Drill 30m solid
Postmortems & SLOs Topic Pack 4h solid
Pulumi Topic Pack 3h solid
Python Async & Concurrency Topic Pack 4h solid
Python Packaging Topic Pack 3h solid
RHCE (EX294) Exam Preparation Topic Pack 40h solid
RabbitMQ & Message Queues Topic Pack 3h solid
Redis Operations Topic Pack 3h solid
Reliability Patterns Topic Pack 1h stub
Runbook: ArgoCD Out of Sync Runbook 15m solid
Runbook: Long-Running Query / Lock Contention Runbook 15m solid
Runbook: PostgreSQL Connection Exhaustion Runbook 15m solid
Runbook: PostgreSQL Disk Space Critical Runbook 15m solid
Runbook: PostgreSQL Replication Lag Runbook 15m solid
Runbook: Terraform Drift Detection Response Runbook 15m solid
Runbook: Terraform State Lock Stuck Runbook 15m solid
SQLite Operations & Internals Topic Pack 3h solid
SRE Practices Topic Pack 5h solid
Skillcheck: FinOps Assessment 30m solid
Skillcheck: GitOps Assessment 30m solid
Skillcheck: Postmortems & SLOs Assessment 30m solid
Terraform Deep Dive Topic Pack 5h solid
The Ops of AI/ML Workloads Topic Pack 4h solid
The Psychology of Incidents Topic Pack 4h solid
Toil Reduction Topic Pack 1h stub
Track: Incident Response Reference 10h solid

Observability

Asset Type Time Status
Alerting Rules Topic Pack 4h solid
Alerting Rules Drills Drill 30m solid
Continuous Profiling Topic Pack 4h solid
Interview: Loki Logs Disappeared Scenario 15m solid
Interview: Prometheus Target Down Scenario 15m solid
Lab: Loki No Logs (CLI) Lab 30m solid
Lab: Prometheus Target Down (CLI) Lab 30m solid
Log Pipelines Topic Pack 5h solid
LogQL Drills Drill 30m solid
Monitoring Migration (Legacy to Modern) Topic Pack 5h solid
Observability Architecture Reference 30m solid
Observability Deep Dive Topic Pack 6h solid
Observability Drills Drill 30m solid
OpenTelemetry Topic Pack 5h solid
PromQL Drills Drill 30m solid
Prometheus Deep Dive Topic Pack 5h solid
Runbook: Alert Storm (Flapping / Too Many Alerts) Runbook 15m solid
Runbook: Log Pipeline Backpressure / Logs Not Appearing Runbook 15m solid
Runbook: Loki No Logs Runbook 15m solid
Runbook: Tempo No Traces Runbook 15m solid
SLO Tooling Topic Pack 4h solid
Skillcheck: Alerting Rules Assessment 30m solid
Skillcheck: Observability Assessment 30m solid
Track: Observability Reference 10h solid

Security

Asset Type Time Status
Compliance & Audit Automation Topic Pack 5h solid
Disaster Recovery & Backup Engineering Topic Pack 5h solid
HashiCorp Vault Topic Pack 4h solid
Infrastructure Forensics Topic Pack 5h solid
Interview: CI Vuln Scan Failed Scenario 15m solid
Interview: Certificate Expired Scenario 15m solid
Interview: Secret Leaked to Git Scenario 15m solid
Interview: Vault Token Expired Scenario 15m solid
LDAP & Identity Management Topic Pack 5h solid
Open Policy Agent Topic Pack 4h solid
Runbook: CVE Response (Critical Vulnerability) Runbook 20m solid
Runbook: Certificate Renewal Failed Runbook 15m solid
Runbook: Credential Rotation (Exposed Secret) Runbook 15m solid
Runbook: Secret Rotation Runbook 15m solid
Runbook: Unauthorized Access Investigation Runbook 20m solid
Runtime Security with Falco Topic Pack 4h solid
SELinux & AppArmor Topic Pack 5h solid
SELinux & Linux Hardening Topic Pack 5h solid
Secrets Management Topic Pack 4h solid
Secrets Management Drills Drill 30m solid
Security Drills Drill 30m solid
Skillcheck: Secrets Management Assessment 30m solid
Skillcheck: Security (Expanded) Assessment 30m solid
Skillcheck: TLS & PKI Assessment 30m solid
Supply Chain Security Topic Pack 3h solid
TLS & PKI Drills Drill 30m solid

Cloud

Asset Type Time Status
AWS CloudWatch Topic Pack 4h solid
AWS ECS Topic Pack 4h solid
AWS Lambda Topic Pack 3h solid
AWS Route 53 Topic Pack 3h solid
Cloud Deep Dive Topic Pack 5h solid
Cloud Deep Dive Drills Drill 30m solid
Runbook: Cloud Capacity Limit Hit Runbook 15m solid
Runbook: VPC IP Exhaustion Runbook 15m solid
Serverless Computing Topic Pack 1h stub

L3: Advanced

Designs systems and mentors others. Deep internals knowledge.

Linux

Asset Type Time Status
Deep Dive: Linux Process Scheduler Deep Dive 45m solid
Deep Dive: eBPF Explained Deep Dive 45m solid
Kernel Troubleshooting Topic Pack 6h solid
eBPF & Modern Linux Observability Topic Pack 5h solid

Kubernetes

Asset Type Time Status
Deep Dive: Kubernetes Scheduler Deep Dive 45m solid
Interview: Database Failover During Deploy Scenario 15m solid
Interview: Service Mesh 503s Scenario 15m solid
Interview: etcd Space Exceeded Scenario 15m solid
Kubernetes Operators Drills Drill 30m solid
Runbook: Istio 503 Errors Runbook 15m solid
Runbook: etcd High Latency / Slow Operations Runbook 20m solid
Scenario: etcd Troubleshooting Scenario 30m solid
Service Mesh Topic Pack 5h solid
Service Mesh Drills Drill 30m solid
Skillcheck: Kubernetes Operators Assessment 30m solid
Skillcheck: Service Mesh Assessment 30m solid

DevOps & Tooling

Asset Type Time Status
WebAssembly for Infrastructure Topic Pack 3h solid