Docker stuff

The first two commands are really cool

docker ps -a will list all containers, whereas docker ps -a -q will list all containers but show only the container ids.  So docker <outer command> $(<inner command>) passes the result of <inner command> to the <outer command>

docker ps -a --format '{{.Namea}}' to list only the names of all running containers, see https://docs.docker.com/engine/reference/commandline/ps/

Stop all currently running containers

docker stop $(docker ps -a -q)

Remove all stopped containers

docker rm $(docker ps -a -q)

docker rm $(docker ps --filter "status=exited" -q)

Build a docker image

docker build -t <image id> <directory where Dockerfile is located>

How to run an image

docker run [-p <host port>:<container exposed port> [-p <further port mappings>] [--name <unique name>] ] <image id>

Listing all running instances and container IDs

docker ps -a

Command to get IP address of docker container

docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' <container_name_or_id>

Shell into a running Docker container (make sure you specify the -it parameter)

Docker exec -it <container id> bash

Shell into a running Docker container as root user (make sure you specify the -it parameter)

docker exec -it -u root <container id> bash

Injecting a command from the host into a container

docker exec -it <container id> <command>

e.g. docker exec -it <container id> bash|sh

Will execute a bash command in the container, the -it gives control back to the host console

e.g. docker exec -it <container id> ls

Will execute the ls command in the container

e.g. docker exec -it <container id> ls -al

Will execute the ls command and pass -al to it as a param

e.g. docker exec -it <container id> bash "<sequence of semicolon separated commands>"

e.g. docker exec -it <container id> bash -c "cd /opt/tomcat; mkdir warfiles"

Starting a docker machine locally on windows

docker-machine -start

How to start a container that might exit immediately

docker run -dit <image name>

Renaming an image

docker tag <image id> <docker repo id>/<image name>[:<tag id>]

Overriding the ENTRYOINT on docker run

docker run --entrypoint "<command to execute>" <image> <param to command to execute, ...>

e.g. docker run --entrypoint "/bin/ls" tomcat -al /root

Cleaning docker space - if you find docker images won't run

docker run --rm -v /var/run/docker.sock:/var/run/docker.sock:ro -v /var/lib/docker:/var/lib/docker martin/docker-cleanup-volumes

Creating a new machine

docker-machine create -d virtualbox default

Removing untagged images

docker rmi $(docker images -f "dangling=true" -q)

Removing images based on a pattern

docker images | grep <pattern> | awk '{print $3}' | xargs docker rmi