Docker Cheat Sheet

CONTAINERS

• Start a running container from an image
  docker run -ti ubuntu bash

• List running containers
  docker ps

• List all containers (stopped & running)
  docker ps -a

• List last container
  docker -l

• Delete a container after it finishes
  docker run -ti --rm ubuntu bash

• Commit a container and create a new image from it. First find the container id or its name then run the following command. Lets say 1234 is container id and my_container is the name
  docker commit 1234 new_image_name OR
  docker commit my_container new_image_name

• Attach an existing running container
  docker attach name_of_container

• Now leaving container wihtout exiting it
  press and hold ctrl + p, ctrl + q

• docker exec creates a new process in the existing container. Although it will die automatically if you close the original process

• docker logs will print the logs of the container
  docker logs container_name

• docker kill will kill the running container
  docker kill container_name

• Removing containers
  docker rm container_name

• If the outside ports are not assigned then it will choose any available port. To see which port it choose, run the following command
  docker port container_name

NETWORKS

• For displaying list of already existing networks.
  docker network ls

• For creating a new network
  docker network create new_network_name

• for starting a container within a network
  docker run -ti --net my_network_name --name my_container_name ubuntu bash

VOLUMES

• 2 main varieties of volumes
  Persistent --> they will still exist when the contaner is stopped
  Ephemeral --> they will be gone when no one (container) is using them
  

• Sharing a volume with the host (Persistant)
  docker run -ti -v /full/path/to/folder:/shared_folder ubuntu bash

• Sharing a volume b/w containers using volume-from (Ephemeral)
  docker run -ti -v /shared-data ubuntu bash

  • In above command Im creating a shared volume on the container that is not shared with the host
    
  • Now create another container and shared the above volume with the new continer
    docker run -ti --volume-from above_container_name ubuntu bash
  • Now important note: The above volume will be available as long as atleast one container is still using it. when no container is active that volume will disappear