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Interview prep for the people who keep production up.

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Every Linux command,
animated.

Watch each command run in a real-looking terminal, see what every part of it means, then try it yourself with practice tasks. From ls to kubectl.

203commands
23tracks
0opened by you

The first three commands on any server: where am I, what's here, and how full is the disk.

devops@devops-lab: ~ — zsh — 96×28
➜ ~
Step 1 of 3
pwd

pwd prints the directory you're in. Every relative path starts from here.

Track 23 of 23

Performance Tuning

Measure CPU, memory and I/O over time, and tune the kernel and limits.

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$sarCollect and replay system activity historyIntermediate$mpstatPer-CPU utilisation: find the hot coreIntermediate$pidstatPer-process CPU, memory, disk and context switches over timeIntermediate$sysctlRead and tune kernel parameters at runtimeIntermediate$ulimitShow and set per-process resource limitsIntermediate$numactlControl NUMA CPU and memory placementAdvanced