Docker
Managing Containers
docker run -i -t ubuntu /bin/bash # create a container docker run --name bob_the_container -i -t ubuntu /bin/bash # create a container with specified name docker ps -a # show all containers docker start bob_the_container # start a stopped container docker attach bob_the_container # attach to a container # NOTE: hit Enter to get a prompt # create daemonized container docker run --name daemon_dave -d ubuntu /bin/sh -c \ "while true; do echo hello world; sleep 1; done" # view terminal output inside the container docker logs daemon_dave docker logs -f daemon_dave # like tail -f docker logs -t daemon_dave # print timestamps docker top daemon_dave # see what's happening inside the container # run a process inside the container docker exec -d daemon_dave touch /etc/config_file # background docker exec -t -i daemon_dave /bin/bash # interactive docker stop daemon_dave # stop a daemonized container # automatic container restarts docker run --restart=always --name daemon_dave -d ubuntu \ /bin/sh -c "while true; do echo hello world; sleep 1; done" # might be better to use this flag --restart=on-failure:5 # max of 5 restarts docker inspect daemon_dave # get container details # get IP address docker inspect --format '{{ .NetworkSettings.IPAddress }}' daemon_dave docker rm 80430f8d0921 # delete a stopped container
Images
Each image belongs to a repository. Repositories are either maintained by Docker, Inc. or by users. Official Docker repositories have a single name like ubuntu
or mysql
, which user-contributed repositories include a username, e.g. jamtur01/puppet
The ubuntu
repository contains images for each version. By default you get the image tagged latest
. You could also specify ubuntu:12.04
or ubuntu:precise
for version 12.04.
docker images # list all local docker images docker images ubuntu # list only ubuntu-related images