Little Docker Tips
Change entrypoint on the fly
docker run -it --entrypoint=/bin/bash <image_name>
Reveal the full command of a container
docker inspect -f "{{.Name}} {{.Config.Cmd}}" $(docker ps -a -q)
BTW, docker ps -a -q only prints container ID, which is better than docker ps -a | awk '{print $1}'.
Clean up dead containers
docker rm $(docker ps --all -q -f status=dead)
Free Docker space
# clean up images
docker rmi $(docker images -a --filter=dangling=true -q)
# clean up ps
docker rm $(docker ps --filter=status=exited --filter=status=created -q)
Note that with -q, docker ps only print CONTAINER ID
List the layers of adocker image
docker inspect <img> | jq .[].RootFS.Layers
# OR
docker history <img>