Linux

Linux Skill

The free, open-source operating system that powers the internet.

Ecosystem Graph Preview

graph LR
  linux["linux"]:::core
  classDef core fill:#f9f,stroke:#333,stroke-width:4px;
  linux -- "integrates with" --> docker
  linux -- "works well with" --> nginx

Recommended Next Skills

• nginx (Score: 0.82) Why: Direct relationship, Both are Infrastructure, Shared ecosystem (devops), Similar network profile
• docker (Score: 0.81) Why: Direct relationship, Both are Infrastructure, Shared ecosystem (devops), Similar network profile
• kubernetes (Score: 0.43) Why: Both are Infrastructure, Shared ecosystem (devops), Can deploy to aws, Similar network profile

Quick Start

Linux is the foundation of modern cloud computing. Understanding the kernel, filesystem hierarchy, and shell commands is required for debugging production outages.

Production Patterns

systemd

For background services running directly on a VM (like an NGINX proxy or a Go binary), do not run them in a tmux session. Write a systemd service file to ensure the process starts on boot and automatically restarts on failure.

Architecture & Scaling

Everything is a file

In Linux, configuration, hardware devices (/dev/sda), and kernel parameters (/proc/sys) are represented as files. You can often read from or write to these files directly to monitor or alter system state.

Error Recovery

When a server runs out of disk space (No space left on device), but df -h shows space available, you have likely run out of inodes. Check df -i. This happens when you have millions of tiny files (like session files or log chunks).

Security Notes

Disable SSH password authentication (PasswordAuthentication no) in /etc/ssh/sshd_config. Exclusively use Ed25519 SSH keys. Use fail2ban to automatically block IPs that repeatedly fail authentication.

References

• Linux Docs

Why use this skill

Use this when your agent works with linux — structured patterns beat pasted docs and prevent common hallucinations.

AI pitfalls

• Hardcoding region or account IDs
• Missing IAM least-privilege on cloud resources
• Confusing similar service names (e.g. S3 vs CloudFront)

Production checklist

• Secrets in environment variables, not source code
• Error handling and logging in place
• Rate limits and timeouts configured

Related skills

• docker — integrates with
• nginx — works well with

Last Verified: 2026-07-02