Linux Docker & Container Errors: daemon, image pull, exit 137, port allocation
Working reference for the 10 most common Linux container errors. Cannot connect to Docker daemon (group / socket diagnosis), pull access denied (registry login + token expiry), overlay2 No space left on device (docker system prune), exit code 137 = SIGKILL by OOM, port allocation conflicts, manifest unknown, restart loops, iptables chain conflicts with firewalld, SELinux :Z mount label, cgroups memory limits. Cross-links to the systemctl / journalctl reference and to CI/CD troubleshooting.
