My Docker Cheat Sheet
Here are few commands that I find myself using a lot when I am working with Docker
Pull docker image from registry
gcloud docker -- pull gcr.io/my-project/my-image
Run pulled image locally
docker run -i -t gcr.io/my-project/my-image /bin/bash
SSH into running container
# use 'docker ps' to get container id
docker exec -it <CONTAINER ID> bash
Here is a hacky bash function that I wrote because I was tired of finding container ids and then typing out full command
# get bash shell on docker container.
# works only if one container is running
function get_bash_docker() {
count=$(docker ps -q | wc -l)
if [[ $count = 1 ]]; then
container_id=$(docker ps -q)
echo "Getting bash shell in ${container_id}"
docker exec -it ${container_id} bash
else
# do not show running container if no containers are running
if [[ $count = 0 ]]; then
echo "No running containers"
return 0
fi
# show running containers
echo "Can't decide, $count containers are running"
echo $(docker ps --format "table {{.ID}}\t{{.Names}}\t{{.Image}}")
echo "SSH into container using CONTAINER ID"
echo "docker exec -it <CONTAINER ID> bash"
return 1
fi
}
# Docker aliases
alias dssh="get_bash_docker"
Remove all local docker images
docker rmi -f $(docker images -a -q)
docker images -a -q will give IMAGE ID of all local images and docker rmi -f will remove images with force.
To remove single image, list all images using docker images -a and remove it using docker rmi -f <IMAGE ID>
Docker System Cleanup
Remove unused data in docker, and get some disk space back
# show docker disk usage
docker system df
# just remove dangling stuff
docker system prune
# this will remove all images, and volumes
docker system prune --all --volumes