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Docker CLI useful command

  • vs code plugin for docker is pretty nice.

  • official overview of docker cli commands.

  • docker build . -t crowdsalat/imageName:tag creates a image based on a Dockerfile and the context/ working directory and subdirectories

  • docker run <image> starts a container from an image
    • -d run as daemon
    • -it runs interactively so you can execute commands in container (-t Allocate a pseudo-tty, -i Keep STDIN open )
    • docker run -it --entrypoint sh crowdsalat/imageName:tag starts a container and starts a interactive shell.
    • -p 500:1000 maps the port 1000 of the container to the port 500 of the host. Reachable under localhost on the host system.
    • -p 192.168.178.123:1000:500 maps the port 1000 of the container to the port of the host. Reachable under localhost on the host system. Reachable under the IP address of the host system.
    • -v /var/logs/ binds /var/logs inside the container to a unnamed volume on the mount which resides in /var/lib/docker/volumes/
    • -v /var/run/docker.sock:/var/run/docker.sock containers started inside of this container will be started on the host a not inside the container (sibling not a child). Useful in CI/CD pipelines which uses containers as runners see: https://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/
    • -e VAR1=bla -e VAR2=blubb defines environmental variables in the container
    • —rm remove container after it is stopped.
    • —name add name to the container.
  • docker history --no-trunc <image> show something similar to the original dockerfile
  • docker exec -it container_name bash connects to a running container with the name container_name
  • docker ps −a shows all running docker container on a client
  • docker image / container / network / volumes / system
    • ls
    • rm
    • inspect
  • docker system prune removes:
    1. all stopped containers (docker container prune)
    2. all networks not used by at least one container (docker network prune)
    3. all dangling images (docker image prune)
    4. all dangling build cache
  • docker network create --driver bridge <bridgeName> create a new bridge network
  • docker volume create <volumeName> create a new bridge volume
  • docker cp <containerName>:<pathInConainer> <pathOnHost> copies data from the container to the host. Helpful if volume were not set up correct

If you pull a image with the latest tag it will first try to download it from docker hub and only if it is not there it will use a local variant.