Docker Cheatsheet

• docker images : list images
• docker ps -a : list containers
• docker network ls : list docker networks
• docker pull [image] : download image from docker registry (docker hub)
• docker rmi [image] : remove image
• docker rm -f [container] : stop and remove container
• docker run -d --name [container] [image] : start container from image
  • -d : run container in background
  • -it : run container interactively
  • -p [host_port]:[container_port] : open ports
  • --restart=unless-stopped : start container when docker starts
• docker build -t [image] . : build image from Dockerfile
  • --nocache : don't use cache
  • --build-arg [var]=[value] : pass env vars

Debug

• docker logs -f [container] : check container stdout
• docker exec -it [container] /bin/bash : explore container
• docker inspect [container] : inspect container
• lazydocker : docker UI
• ctop : btop for docker

Cleanup

• docker image prune : remove untagged images
• docker container prune : remove unused containers
• docker network prune : remove unused docker networks
• docker system prune : remove image + container + network + build caches

Service

• sudo systemctl status docker : check docker status
• sudo systemctl enable docker : start docker at boot

Update docker container

• docker pull [image]
• docker rm -f [container]
• docker run ...
• docker system prune or
• cd [docker-compose.yml]
• docker compose pull
• docker compose up -d
• docker system prune