I’ve been playing with Docker recently, but not enough that I always remember the commands. Here’s my cheat sheet for future Docker use.
- Remove everything not in use with
docker system prune -a
- Pull an image with
docker pull. For example:
docker pull alpine
- Remove all images not used by containers with
docker image prune -a
cdinto a directory containing a Dockerfile and build a container with
docker build -t imagename .
- Start a container from an image with
docker run imagename. Docker will pull the specified image from Docker Hub if you don’t have it locally.
docker run -it imagename /bin/shor
docker run -it imagename /bin/bashto get an interactive shell into the container.
- Some images specify entrypoints. In this case, override with
docker run -it --entrypoint /bin/sh imagename
- Usually, you want to use
docker runto have the container automatically deleted when it exits. Remember that anything you store in the container filesystem will be deleted when the container is stopped!
- Map a port from the container to your host with
-p 80:4000. In this example, container port 4000 is mapped to port 80 on the host. Host first!
- Create a bind mount with
--volume $PWD:/site/. In this example, the current host working directory is mapped to
/site/in the container.