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Footguns & Pitfalls

Every footgun, gotcha, and common mistake across all topics. Learn from others' pain before it becomes yours.

237 files across 10 domains

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Linux

Topic Tier Level Link
Advanced Bash Core L1 footguns.md
Binary And Floats Specialty L1 footguns.md
cgroups & Linux Namespaces Professional L2 footguns.md
Cron Scheduling Core L1 footguns.md
Debian & Ubuntu Ecosystem Core L1 footguns.md
Disk And Storage Ops Core L1 footguns.md
DNF Package Manager Core L2 footguns.md
Ebpf Observability Core L3 footguns.md
Environment Variables Core L1 footguns.md
Inodes (alias → filesystems_storage) Core L1 footguns.md
iptables & nftables Core L1 footguns.md
Kernel Troubleshooting Core L3 footguns.md
Linux Boot Process Core L1 footguns.md
Linux Data Hoarding Professional L2 footguns.md
Linux Distro Comparison Core L1 footguns.md
Linux Hardening Core L2 footguns.md
Linux Kernel Tuning Professional L2 footguns.md
Linux Logging Core L1 footguns.md
Linux Memory Management Core L1 footguns.md
Linux Ops Core L0 footguns.md
Linux Ops Storage Core L1 footguns.md
Linux Ops systemd Core L1 footguns.md
Linux Performance Tuning Core L2 footguns.md
Linux Signals And Process Control Core L1 footguns.md
Linux Text Processing Core L1 footguns.md
Linux Users & Permissions Core L1 footguns.md
LPIC / LFCS Exam Professional L2 footguns.md
Mounts & Filesystems (alias) Core L1 footguns.md
Package Management Core L1 footguns.md
Perf Profiling Core L2 footguns.md
Pipes And Redirection Core L1 footguns.md
/proc Filesystem Professional L2 footguns.md
Process Management Core L1 footguns.md
rsync Core L1 footguns.md
SSH Deep Dive Core L1 footguns.md
Storage Ops Core L2 footguns.md
strace Professional L1 footguns.md
systemctl & journalctl Deep Dive Core L1 footguns.md
Tar And Compression Core L1 footguns.md
Terminal Internals Specialty L1 footguns.md
Tmux And Screen Core L1 footguns.md

Networking

Topic Tier Level Link
ARP Life Skills L1 footguns.md
BGP EVPN / VXLAN Professional L2 footguns.md
Cisco Fundamentals For Devops Core L1 footguns.md
Dhcp Ipam Core L1 footguns.md
DNS Deep Dive Core L1 footguns.md
Dns Ops Core L2 footguns.md
DNSSEC & DNS Security Professional L2 footguns.md
Email Infrastructure Core L1 footguns.md
Firewalls Core L1 footguns.md
gRPC & Protocol Buffers Specialty L2 footguns.md
Http Protocol Core L0 footguns.md
Ipmi And Ipmitool Core L1 footguns.md
LACP / Link Aggregation Life Skills L1 footguns.md
Load Balancing Core L2 footguns.md
Mellanox Switches Professional L2 footguns.md
MTU Life Skills L1 footguns.md
NAT Life Skills L1 footguns.md
Network Automation Professional L2 footguns.md
Networking Core L1 footguns.md
Networking Troubleshooting Core L1 footguns.md
Routing Core L1 footguns.md
STP / Spanning Tree Life Skills L1 footguns.md
Subnetting & IP Addressing Core L1 footguns.md
Tailscale & Zero Trust Networking Specialty L2 footguns.md
TCP/IP Deep Dive Professional L2 footguns.md
VLANs Core L1 footguns.md
Vpn Tunneling Life Skills L2 footguns.md
Wireshark & Packet Analysis Specialty L2 footguns.md

Datacenter & Hardware

Topic Tier Level Link
Bare Metal Provisioning Core L2 footguns.md
Dell PowerEdge Specialty L1 footguns.md
Firmware / BIOS / UEFI Core L1 footguns.md
Power & UPS Core L1 footguns.md
Redfish API Core L1 footguns.md
Server Hardware Core L1 footguns.md
Virtualization Life Skills L2 footguns.md
VMware Professional L2 footguns.md

Kubernetes

Topic Tier Level Link
Api Gateways Specialty L2 footguns.md
Argo Workflows Professional L2 footguns.md
cert-manager Core L1 footguns.md
Cilium & eBPF Networking Professional L2 footguns.md
HashiCorp Consul Professional L2 footguns.md
Container Images Core L1 footguns.md
CrashLoopBackOff (alias) Professional L1 footguns.md
Database Operations Professional L2 footguns.md
Docker / Containers Core L1 footguns.md
Envoy Proxy Professional L2 footguns.md
etcd Professional L1 footguns.md
Istio Service Mesh Professional L2 footguns.md
Kubernetes Concept Chain Core L0 footguns.md
K8S Debugging Playbook Core L2 footguns.md
K8s Ecosystem Professional L0 footguns.md
Kubernetes Networking Professional L1 footguns.md
Node Lifecycle & Maintenance Specialty L2 footguns.md
K8S Ops Core L2 footguns.md
K8S Pods And Scheduling Core L1 footguns.md
RBAC Professional L1 footguns.md
K8S Services And Ingress Core L1 footguns.md
Kubernetes Storage Professional L1 footguns.md
Kustomize Professional L1 footguns.md
Multi-Tenancy Patterns Specialty L2 footguns.md
Node Maintenance (alias → k8s_node_lifecycle) Professional L1 footguns.md
OOMKilled (alias) Professional L1 footguns.md
Policy Engines Specialty L2 footguns.md
Progressive Delivery Core L2 footguns.md
Service Mesh Specialty L3 footguns.md

DevOps & Tooling

Topic Tier Level Link
AI Tools for DevOps Life Skills L1 footguns.md
Ai Ml Ops Life Skills L2 footguns.md
Ansible Core L1 footguns.md
Ansible Deep Dive Professional L2 footguns.md
ArgoCD & GitOps Core L2 footguns.md
Backstage & Developer Portals Specialty L2 footguns.md
Capacity Planning Specialty L2 footguns.md
Career Engineering Life Skills L0 footguns.md
Ceph Storage Professional L2 footguns.md
Change Management Core L1 footguns.md
Chaos Engineering Specialty L2 footguns.md
CI/CD Core L1 footguns.md
Claude Code Life Skills L1 footguns.md
Compliance Automation Life Skills L2 footguns.md
Containers Deep Dive Core L1 footguns.md
Corporate It Fluency Life Skills L0 footguns.md
Crossplane Specialty L2 footguns.md
Css Fundamentals Life Skills L0 footguns.md
Dagger / CI as Code Life Skills L2 footguns.md
Database Internals Specialty L1 footguns.md
Debugging Methodology Core L1 footguns.md
Distributed Systems Fundamentals Core L2 footguns.md
DORA Metrics & DevEx Professional L1 footguns.md
Edge & IoT Infrastructure Life Skills L2 footguns.md
Elasticsearch Life Skills L1 footguns.md
Feature Flags Core L1 footguns.md
FinOps Specialty L2 footguns.md
Fleet Operations Core L2 footguns.md
Git Core L0 footguns.md
Git Advanced Professional L2 footguns.md
Git Workflows & Branching Strategies Core L2 footguns.md
GitHub Actions Professional L1 footguns.md
GitOps Professional L1 footguns.md
GraphQL Professional L2 footguns.md
Helm Core L1 footguns.md
Homelab Life Skills L0 footguns.md
Incident Command Professional L2 footguns.md
Incident Psychology Specialty L2 footguns.md
Infrastructure Testing Professional L2 footguns.md
Kafka Life Skills L1 footguns.md
Legacy Archaeology Life Skills L1 footguns.md
Load Testing Core L1 footguns.md
Make And Build Systems Professional L1 footguns.md
Message Queues Professional L2 footguns.md
MongoDB Operations Core L1 footguns.md
MySQL / MariaDB Operations Core L1 footguns.md
Nginx Web Servers Core L1 footguns.md
Nix / NixOS Specialty L2 footguns.md
OpenTofu & Terraform Ecosystem Specialty L2 footguns.md
Ops War Stories Life Skills L2 footguns.md
Packer Specialty L1 footguns.md
Platform Engineering Specialty L2 footguns.md
PostgreSQL Operations Professional L2 footguns.md
Postmortems & SLOs Specialty L2 footguns.md
PowerShell Life Skills L1 footguns.md
Pulumi Life Skills L2 footguns.md
Python Async & Concurrency Professional L2 footguns.md
Python Debugging Core L1 footguns.md
Python Infra Core L1 footguns.md
Python Packaging Core L2 footguns.md
RabbitMQ & Message Queues Life Skills L2 footguns.md
Redis Operations Specialty L2 footguns.md
RHCE (EX294) Exam Core L2 footguns.md
Runbook Craft Core L1 footguns.md
S3-Compatible Object Storage Core L1 footguns.md
Sql Fundamentals Professional L0 footguns.md
SQLite Operations & Internals Life Skills L2 footguns.md
Sre Practices Professional L2 footguns.md
Systems Thinking Specialty L1 footguns.md
Terraform Professional L1 footguns.md
Terraform Deep Dive Professional L2 footguns.md
Vendor Management & Escalation Core L1 footguns.md
VS Code Life Skills L0 footguns.md
WebAssembly for Infrastructure Life Skills L3 footguns.md

CLI Tools

Topic Tier Level Link
awk Core L1 footguns.md
Curl And Wget Core L1 footguns.md
fd Life Skills L1 footguns.md
Find Core L1 footguns.md
fzf Life Skills L1 footguns.md
Grep And Regex Core L1 footguns.md
jq / JSON Processing Life Skills L1 footguns.md
Modern CLI Tools Life Skills L0 footguns.md
Modern CLI Workflows Life Skills L1 footguns.md
Regex Text Wrangling Core L1 footguns.md
ripgrep (rg) Life Skills L1 footguns.md
sed Core L1 footguns.md
xargs Core L1 footguns.md
YAML, JSON & Config Formats Professional L1 footguns.md

Observability

Topic Tier Level Link
Alerting Rules Professional L2 footguns.md
Continuous Profiling Professional L2 footguns.md
Log Pipelines Professional L2 footguns.md
Monitoring Fundamentals Core L1 footguns.md
Monitoring Migration Core L2 footguns.md
Observability Deep Dive Professional L2 footguns.md
OpenTelemetry Specialty L2 footguns.md
Prometheus Deep Dive Professional L2 footguns.md
SLO Tooling Professional L2 footguns.md
Synthetic Monitoring Core L1 footguns.md
Tracing Specialty L1 footguns.md

Security

Topic Tier Level Link
Audit Logging Specialty L1 footguns.md
Backup & Restore Professional L1 footguns.md
Disaster Recovery Core L2 footguns.md
Runtime Security with Falco Professional L2 footguns.md
HashiCorp Vault Professional L2 footguns.md
Incident Triage Professional L1 footguns.md
Infra Forensics Specialty L2 footguns.md
Ldap Identity Specialty L2 footguns.md
Offensive Security Basics Specialty L1 footguns.md
Open Policy Agent Professional L2 footguns.md
OpSec Mistakes Specialty L1 footguns.md
Secrets Management Professional L2 footguns.md
Security Basics Professional L1 footguns.md
Security Scanning Professional L1 footguns.md
Selinux Apparmor Core L2 footguns.md
Supply Chain Security Professional L2 footguns.md
TLS & Certificates Ops Core L1 footguns.md

Cloud

Topic Tier Level Link
AWS CloudWatch Professional L2 footguns.md
AWS EC2 Core L1 footguns.md
AWS ECS Professional L2 footguns.md
AWS IAM Core L1 footguns.md
AWS Lambda Professional L2 footguns.md
AWS Networking Core L1 footguns.md
AWS Route 53 Professional L2 footguns.md
AWS S3 Deep Dive Core L1 footguns.md
AWS Troubleshooting Core L1 footguns.md
Azure Troubleshooting Life Skills L1 footguns.md
Cloud Deep Dive Core L2 footguns.md
Cloud Ops Basics Core L1 footguns.md
GCP Troubleshooting Life Skills L1 footguns.md

Miscellaneous

Topic Tier Level Link
Datacenter Life Skills L1 footguns.md
mergerfs Life Skills L2 footguns.md