Skip to content

Trivia & Interesting Facts

Surprising, historical, and little-known facts across all topics. 207 topics, 2197 facts.

Domains

Linux

Topic Tier Facts
Advanced Bash Core 13
Binary And Floats Specialty 10
Cron Scheduling Core 12
Debian & Ubuntu Ecosystem Core 12
Disk And Storage Ops Core 12
Ebpf Observability Core 10
Inodes (alias → filesystems_storage) Core 11
iptables & nftables Core 10
Kernel Troubleshooting Core 12
Linux Boot Process Core 10
Linux Distro Comparison Core 12
Linux Hardening Core 12
Linux Logging Core 16
Linux Memory Management Core 10
Linux Ops Core 20
Linux Ops Storage Core 11
Linux Ops systemd Core 12
Linux Performance Tuning Core 18
Linux Text Processing Core 16
Linux Users & Permissions Core 10
LPIC / LFCS Exam Professional 11
Mounts & Filesystems (alias) Core 11
Package Management Core 11
Perf Profiling Core 11
Process Management Core 12
rsync Core 10
SSH Deep Dive Core 10
Storage Ops Core 11
strace Professional 10
Terminal Internals Specialty 12

Networking

Topic Tier Facts
ARP Life Skills 10
BGP EVPN / VXLAN Professional 11
Cisco Fundamentals For Devops Core 10
Dhcp Ipam Core 10
Dns Ops Core 10
DNSSEC & DNS Security Professional 10
Email Infrastructure Core 12
Firewalls Core 10
gRPC & Protocol Buffers Specialty 10
Http Protocol Core 11
Ipmi And Ipmitool Core 11
LACP / Link Aggregation Life Skills 9
Load Balancing Core 10
MTU Life Skills 9
NAT Life Skills 10
Network Automation Professional 11
Networking Core 10
Networking Troubleshooting Core 11
Routing Core 10
STP / Spanning Tree Life Skills 9
Subnetting & IP Addressing Core 10
Tailscale & Zero Trust Networking Specialty 10
VLANs Core 9
Vpn Tunneling Life Skills 10
Wireshark & Packet Analysis Specialty 10

Datacenter & Hardware

Topic Tier Facts
Bare Metal Provisioning Core 10
Dell PowerEdge Specialty 11
Firmware / BIOS / UEFI Core 10
Power & UPS Core 11
Redfish API Core 10
Server Hardware Core 11
Virtualization Life Skills 11

Kubernetes

Topic Tier Facts
Api Gateways Specialty 10
Argo Workflows Professional 10
cert-manager Core 10
Cilium & eBPF Networking Professional 11
HashiCorp Consul Professional 12
Container Images Core 19
CrashLoopBackOff (alias) Professional 11
Database Operations Professional 9
Docker / Containers Core 13
Envoy Proxy Professional 11
etcd Professional 10
Istio Service Mesh Professional 10
K8S Debugging Playbook Core 11
K8s Ecosystem Professional 20
Kubernetes Networking Professional 12
Node Lifecycle & Maintenance Specialty 11
K8S Ops Core 20
RBAC Professional 11
Kubernetes Storage Professional 11
Kustomize Professional 10
Multi-Tenancy Patterns Specialty 11
Node Maintenance (alias → k8s_node_lifecycle) Professional 10
OOMKilled (alias) Professional 12
Policy Engines Specialty 10
Progressive Delivery Core 12
Service Mesh Specialty 10

DevOps & Tooling

Topic Tier Facts
AI Tools for DevOps Life Skills 10
Ai Ml Ops Life Skills 11
Ansible Core 20
ArgoCD & GitOps Core 10
Backstage & Developer Portals Specialty 10
Capacity Planning Specialty 10
Career Engineering Life Skills 8
Ceph Storage Professional 10
Change Management Core 7
Chaos Engineering Specialty 12
CI/CD Core 17
Claude Code Life Skills 10
Compliance Automation Life Skills 10
Containers Deep Dive Core 12
Corporate It Fluency Life Skills 7
Crossplane Specialty 9
Css Fundamentals Life Skills 7
Dagger / CI as Code Life Skills 10
Database Internals Specialty 10
Debugging Methodology Core 7
Distributed Systems Fundamentals Core 10
DORA Metrics & DevEx Professional 9
Edge & IoT Infrastructure Life Skills 10
Elasticsearch Life Skills 9
Feature Flags Core 10
FinOps Specialty 10
Fleet Operations Core 11
Git Core 11
Git Advanced Professional 10
GitHub Actions Professional 10
GitOps Professional 10
GraphQL Professional 10
Helm Core 11
Homelab Life Skills 10
Incident Command Professional 11
Incident Psychology Specialty 11
Infrastructure Testing Professional 10
Kafka Life Skills 9
Legacy Archaeology Life Skills 11
Load Testing Core 11
Make And Build Systems Professional 10
Message Queues Professional 1
MongoDB Operations Core 9
MySQL / MariaDB Operations Core 9
Nginx Web Servers Core 10
Nix / NixOS Specialty 10
OpenTofu & Terraform Ecosystem Specialty 9
Ops War Stories Life Skills 11
Packer Specialty 9
Platform Engineering Specialty 10
PostgreSQL Operations Professional 10
Postmortems & SLOs Specialty 9
PowerShell Life Skills 11
Pulumi Life Skills 7
Python Debugging Core 10
Python Infra Core 11
Python Packaging Core 10
RabbitMQ & Message Queues Life Skills 9
Redis Operations Specialty 9
RHCE (EX294) Exam Core 11
Runbook Craft Core 11
S3-Compatible Object Storage Core 11
Sql Fundamentals Professional 10
SQLite Operations & Internals Life Skills 9
Sre Practices Professional 11
Systems Thinking Specialty 7
Terraform Professional 12
Vendor Management & Escalation Core 10
VS Code Life Skills 11
WebAssembly for Infrastructure Life Skills 11

CLI Tools

Topic Tier Facts
awk Core 8
Curl And Wget Core 10
fd Life Skills 10
Find Core 10
fzf Life Skills 11
jq / JSON Processing Life Skills 11
Modern CLI Tools Life Skills 11
Modern CLI Workflows Life Skills 11
Regex Text Wrangling Core 12
ripgrep (rg) Life Skills 10
sed Core 7
xargs Core 10

Observability

Topic Tier Facts
Alerting Rules Professional 9
Continuous Profiling Professional 9
Log Pipelines Professional 9
Monitoring Fundamentals Core 9
Monitoring Migration Core 9
Observability Deep Dive Professional 9
OpenTelemetry Specialty 10
SLO Tooling Professional 9
Synthetic Monitoring Core 10
Tracing Specialty 11

Security

Topic Tier Facts
Audit Logging Specialty 10
Backup & Restore Professional 12
Disaster Recovery Core 11
Runtime Security with Falco Professional 9
HashiCorp Vault Professional 10
Incident Triage Professional 10
Infra Forensics Specialty 10
Ldap Identity Specialty 10
Offensive Security Basics Specialty 11
Open Policy Agent Professional 10
OpSec Mistakes Specialty 10
Secrets Management Professional 10
Security Basics Professional 10
Security Scanning Professional 10
Selinux Apparmor Core 9
Supply Chain Security Professional 11
TLS & Certificates Ops Core 19

Cloud

Topic Tier Facts
AWS EC2 Core 10
AWS IAM Core 10
AWS Lambda Professional 10
AWS Networking Core 10
AWS Troubleshooting Core 10
Azure Troubleshooting Life Skills 10
Cloud Deep Dive Core 11
Cloud Ops Basics Core 10
GCP Troubleshooting Life Skills 9

Miscellaneous

Topic Tier Facts
Datacenter Life Skills 19