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The ShellQuest blog
Mental models and practical troubleshooting, written like a senior engineer explaining it at the whiteboard.
CareerSRE
What Makes a Great Infrastructure Engineer?
It isn't the number of commands you've memorised. It's how you think when something is broken and the pressure is on.
2 Mar 2026 · 6 min
LinuxSysadmin
The 20 Linux Commands That Actually Matter for Sysadmins
Not a cheat sheet of 200 commands you'll never use — the 20 you'll reach for in real incidents, and what each is really for.
23 Feb 2026 · 8 min
NetworkingTroubleshooting
Why Ping Working Does Not Mean the Network Is Fine
Ping proves one tiny thing. Here's what it does and doesn't tell you — and how to actually test the layer that matters.
16 Feb 2026 · 5 min
LinuxPerformance
Linux Load Average Explained Without Lies
Load average isn't CPU usage. Here's what those three numbers actually count — and why high load with idle CPU is the tell for an I/O problem.
9 Feb 2026 · 6 min
DNSNetworking
How to Troubleshoot DNS Like an Infrastructure Engineer
A repeatable method for name-resolution failures: compare resolvers, walk the hierarchy, and stop blaming the wrong team.
2 Feb 2026 · 7 min