Linux administration and shell scripting
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A step-by-step roadmap to go from Linux beginner to production-ready SRE. No hand-waving, no "just practice more" -- a concrete month-by-month plan with specific skills, projects, and checkpoints. This roadmap is built from real hiring patterns at companies that run Linux in production.
These are the actual questions asked at Amazon, Google, and top startups. Not "what is Linux?" fluff -- real questions that test whether you can operate production systems under pressure. Each answer is concise enough to give in an interview, with the exact command or concept you need.
Single point of failure = guaranteed downtime. Your app might be perfect, your code might be clean, but if it runs on one server and that server dies at 3 AM, your customers see a blank page. High availability isn't optional for production -- it's the minimum bar. Let's build infrastructure that survives server failures automatically.
Managing 50 servers manually? SSHing into each one to update packages, add users, or change a config file? That's not engineering -- that's suffering. Ansible lets you describe the state you want and applies it across your entire fleet in one command. No agents to install, no master server to maintain -- just SSH and YAML.
It's not a matter of IF your disk fails -- it's WHEN. RAID is not a backup. Snapshots are not a backup. That "I'll set up backups next week" has been on your to-do list for six months. Today we build a real backup strategy that you can deploy in production and actually trust.
Your server crashed last night and nobody noticed until morning. The disk filled up at 2 AM, the OOM killer took out your application at 3 AM, and your team found out from angry customers at 9 AM. This is what happens when you run production without monitoring. Let's fix that in 15 minutes.