Intro Docker Commands

Installing docker is easy and well documented at Docker Docs. Here are some quick commands you can use to get started with Docker containers.

Getting Started

• Docker version:

  docker --version
  

• Check that Docker is working by running the hello-world container:

  docker run hello-world
  

• List all images that are locally stored:

  docker image ls
  

Starting a Container

• Start a Docker container

  docker container run --name <Name of container>
  

• Run docker container in interactive mode

  docker run -it --name my-container image_id_here
  

• List Docker containers (running and stopped):

  docker container ls --all
  

• Start container and map a local OS port to docker port

  docker run -d -p 80:80 nginx
  

• Start a container and map a service port to a random port

  docker run -d -P nginx
  

Image Management

• Pull an image from Docker Hub:

  docker pull <user_name>/<repo_name>:<version_v1>
  

• Push an image to Docker Hub:

  docker push <user_name>/<repo_name>:<version>
  

• Tag a container

  docker tag <image_id> peteawalk/<name_of_repo>:v1
  

• Pull an image from Docker Hub registry:

  docker pull alpine:3.4
  

• Delete an image from the local image store:

  docker image rm alpine:3.4
  

Container Management

• Look for all containers running or exited:

  peterconqueso@pop-os:~$ docker ps -a
  CONTAINER ID   IMAGE          COMMAND                  CREATED        STATUS                      PORTS     NAMES
  8a9c5b104898   40afe17d4955   "/sbin/tini -- /usr/…"   24 hours ago   Exited (129) 23 hours ago             jenkins
  

• Access Docker container with bash shell:

  docker exec -it <Name of container> /bin/bash
  

• Run a quick command (file system sizing) in container without accessing container:

  docker exec -it <Name of container> df -hP
  

• Look at container information, such as state, image, config

  docker container inspect <container_id>
  

• Grab docker container IP Addres

  docker container inspect <container_id> | grep IPAdd
  

• Remove unused containers

  docker container rm <container_id>
  

• Remove all stopped and exited containers AND free up disk space:

  docker container prune