Docker#

Running without sudo#

By default, Docker commands can only be run with sudo. This can be circumvented by creating a group docker and adding your user to it. Note that this approach will give the user unrestricted root access to the system without password protection. Afterwards, either log out and back in or run newgrp docker to activate the changes.

Quick Reference#

  • download image from Docker Hub

    $ docker pull <image>   # name of the image to download

  • list the images

    $ docker images

  • remove/delete an image

    $ docker rmi <image>

  • create a container from an image and start/run it

    $ docker run -d \                       # run as a daemon
    -e <var>=<value> \                  # set environment variable <var> to <value> inside the container
    --mount \                           # mount a directory from the host system inside the container
        type=bind,\
        source=<host-dir>,\             # directory on the host system
        target=<container-dir> \        # directory on the container
    -p <host-port>:<container-port> \   # publish a container port on the host system
    -t \                                #
    --name <name> \                     # name to give to the container
    <image>                             # image from which to create the container

  • list the containers

    $ docker ps         # list the currently running containers
$ docker ps --all   # list all containers, including stopped ones

  • stop/kill a running container

    $ docker stop <container>   # the container name or ID
$ docker kill <container>   # the container name or ID

  • remove/delete a container

    $ docker rm <container>

  • run a command line command inside a container from the outside

    $ docker exec <container> \   # the container name or ID
    <command> [<args>]        # the command (and possibly its arguments)

  • create a new image from a container and its changes

    $ docker commit \
    --change <change> \   # change to make to the container, e.g.
                          # - 'ENV <var> <value' to set/change an
                          #    environment variable
    <container> \         # the container to use as a basis/blueprint
    <image>               # the name of the image to create