# Check if docker engine is running
$ docker info
# Build an image with a tag
# /path : specify the path to the context, where it searches the Dockerfile
$ docker build -f Dockerfile -t repo_name:tag_name /path
# Run a container with a docker_img by ID or Repo:Tag
# --rm : container to be removed when exiting or when the daemon exits
# -i : keep STDIN open even if not attached
# -t : allocate a pseudo-tty
# -d : start in detached mode
# -p : bind container port to host machine port
# localhost IP 127.0.0.1 is default for host_port if not specified
# --name : give the container a customized name
$ docker run --rm -itd -v /host/path/to/map:/container/path -p host_port:container_port --name given_container_name docker_img
# Show running containers
$ docker ps
# Or,
$ docker container ls
# To view stopped but yet removed containers
$ docker ps -a
# Attach to a running container by ID or Name
$ docker attach docker_container
# Detach from a container:
# Press Ctrl+P, followed by Ctrl+Q
# Show logs from a container
$ docker logs container_id_or_name
# Continuously show logs
$ docker logs container_id_or_name -f
# Stop a container
$ docker stop container_id_or_name
# Run command outside the docker environment
# Really useful if the prompt isn't available in the docker environment
$ docker exec -d container_id_or_name your_cmd
# Check docker networks
$ docker network lsIn the Docker Hub, there are tons of officially built images that can be used directly. For example, to use Ubuntu Lunar release, search for ubuntu as the repository, go to the tag page and find the release lunar-20230314.
We can specify the FROM repo:tag in the Dokcerfile so the build stage will pull that image.
$ cat Dockerfile
FROM ubuntu:lunar-20230314