Docker Cheat Sheet:
Exit Docker console
^p + ^q
Copy files between Docker container and host
docker cp <containerId>:/file/path/within/container /host/path/target
Update docker images
docker images | grep -v REPOSITORY | awk '{printf("%s:%s\n", $1, $2)}' | xargs -L1 docker pull
Find the dependent child images on Docker
docker inspect --format='{{.Id}} {{.Parent}}' $(docker images --filter since=<image id> -q)
Check docker logs size
docker inspect --format='' $(docker ps -a -q) | grep "LogPath" | awk -F: '{gsub(/"/, "", $2); gsub(/ /, "", $2); print substr($2, 1, length($2)-1)}' | sudo xargs -n 1 du -ah
Removing Docker containers and images
- List all exited containers
docker ps -aq -f status=exited docker ps --all - Remove stopped containers
docker container prune docker ps -aq --no-trunc | xargs docker rm - Remove dangling/untagged images
docker image prune docker images -q --filter dangling=true | xargs docker rmi - Remove containers created after a specific container
docker ps --since a1bz3768ez7g -q | xargs docker rm - Remove containers created before a specific container
docker ps --before a1bz3768ez7g -q | xargs docker rm - Use –rm for docker build
Use –rm together with docker build to remove intermediary images during the build process.
Docker logs
- Clean container’s log
sudo -i
echo "" > $(docker inspect --format='{{.LogPath}}' <container_name_or_id>)
- Setting docker daemon configuration file /etc/docker/daemon.json
{ "log-driver": "json-file", "log-opts": {"max-size": "10m", "max-file": "3"} }
Push image to Docker hub
docker logoin
docker images
docker tag <image id> <yourhubusername>/<imagename>[:image-tag]
Example:
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
verse_gapminder_gsl latest 023ab91c6291 3 minutes ago 1.975 GB
verse_gapminder latest bb38976d03cf 13 minutes ago 1.955 GB
rocker/verse latest 0168d115f220 3 days ago 1.954 GB
$ docker tag bb38976d03cf yourhubusername/verse_gapminder:firsttry
$ docker push yourhubusername/verse_gapminder
Source:
https://blog.octo.com/en/kubernetes-vs-swarm-volumes/