Docker¶
Terminology¶
Container: A container is used to execute an image. See docker run
,
docker-compose up
.
Image: A kind of snapshot of a computer system that can be run in a container.
Images are built from Dockerfiles. See docker build
, docker-compose build
.
Common commands¶
Build an image from Dockerfile in current directory:
docker build -t imagetag .
Start a container from an image, run a command, and when the command exits, stop the container without saving any changes:
docker run --rm -it imagetag bash
Cleanup¶
remove docker containers¶
see: http://stackoverflow.com/questions/32723111/how-to-remove-old-and-unused-docker-images
$ docker ps
$ docker ps -a
$ docker rm $(docker ps -qa --no-trunc --filter "status=exited")
remove docker images¶
see: http://stackoverflow.com/questions/32723111/how-to-remove-old-and-unused-docker-images
$ docker images
$ docker rmi $(docker images --filter "dangling=true" -q --no-trunc)
$ docker images | grep "none"
$ docker rmi $(docker images | grep "none" | awk '/ / { print $3 }')
delete volumes¶
see: https://github.com/chadoe/docker-cleanup-volumes
$ docker volume rm $(docker volume ls -qf dangling=true)
$ docker volume ls -qf dangling=true | xargs -r docker volume rm
delete networks¶
$ docker network ls $ docker network ls | grep “bridge” $ docker network rm $(docker network ls | grep “bridge” | awk ‘/ / { print $1 }’)
Resize disk space for docker vm¶
$ docker-machine create --driver virtualbox --virtualbox-disk-size "40000" default