docker

Identity

• Unit: docker.service (and docker.socket)
• Config: /etc/docker/daemon.json
• Logs: journalctl -u docker, docker logs <container>
• Data root: /var/lib/docker/ (images, containers, volumes)
• Socket: /var/run/docker.sock (root access — treat as root equivalent)
• Install: apt install docker.io (distro pkg) or official: curl -fsSL https://get.docker.com | sh

Key Operations

• List containers: docker ps (running), docker ps -a (all)
• Container logs: docker logs <name> / docker logs -f <name> (follow)
• Exec into container: docker exec -it <name> bash (or sh if no bash)
• Inspect: docker inspect <name> (full JSON config)
• Stats: docker stats (live resource usage)
• Validate daemon config: dockerd --validate (or check journalctl -u docker after systemctl restart docker)
• Prune unused: docker system prune -a (images, stopped containers, networks, build cache)
• Disk usage: docker system df

Expected Ports