Container-safe Linux Users
Avoid root and set correct users for containers.
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Linux Signals (SIGTERM, SIGINT, SIGKILL)
How shutdowns and kills affect apps.
Permissions in Container Volumes
Handle file access issues inside containers.
Disk Usage and Cleanup (df, du, ncdu)
Avoid system crashes due to full disks.
Logs and journalctl
Read and understand logs to debug like a ninja.
Performance Tools (top, htop, iostat)
Quickly check CPU, memory, and IO performance.