Peter Walker
DevOps-ish

DevOps-ish

Intro Docker Commands

Intro Docker Commands

Quick way to get started with Docker post install

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
    
 
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