LinuxProcesses
Load average 15 on 4 cores, but the CPU is 90% idle
Linux load average counts processes waiting on disk or NFS, not just CPU. How to spot D-state processes, why kill -9 cannot touch them, and what to fix instead.
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Processes
Process states, signals, zombies and load average: what ps and top are actually telling you.
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KubernetesProcesses
What happens between kubectl delete pod and the container disappearing
SIGTERM, the grace period, SIGKILL - and the endpoint removal running at the same time. Why pods drop requests on deploy, and how preStop and graceful shutdown fix it.
ProcessesLinuxDocker
Zombie processes (<defunct>): why kill doesn't work and what does
A zombie is a child that has exited but was never reaped by its parent. Why kill -9 does nothing, how to find the parent, and why containers need a PID 1 that reaps.