Docker installation on Ubuntu

This article provides detailed steps for installing Docker on Ubuntu. In this article commands are executed on Ubuntu 20.04 LTS.

Run all of the below commands with either root user or with with sudo privileges.

  • Run below two commands for updating apt packages
  • 
    apt-get update
    apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
    
    
  • Add official GPG key for Docker
  • 
    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
    
    
  • Set up Docker repository
  • 
    add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
    
    
  • Install Docker Engine
  • 
    apt-get install docker-ce docker-ce-cli containerd.io
    
    
  • Test Docker installation
  • 
    docker run hello-world
    
    

    If you are getting output similar to as shown below, than Docker is successfully installed

    
      Unable to find image 'hello-world:latest' locally
      latest: Pulling from library/hello-world
      0e03bdcc26d7: Pull complete
      Digest: sha256:8c5aeeb6a5f3ba4883347d3747a7249f491766ca1caa47e5da5dfcf6b9b717c0
      Status: Downloaded newer image for hello-world:latest
    
      Hello from Docker!
      This message shows that your installation appears to be working correctly.
    
      To generate this message, Docker took the following steps:
       1. The Docker client contacted the Docker daemon.
       2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
          (amd64)
       3. The Docker daemon created a new container from that image which runs the
          executable that produces the output you are currently reading.
       4. The Docker daemon streamed that output to the Docker client, which sent it
          to your terminal.
    
      To try something more ambitious, you can run an Ubuntu container with:
       $ docker run -it ubuntu bash
    
      Share images, automate workflows, and more with a free Docker ID:
       https://hub.docker.com/
    
      For more examples and ideas, visit:
       https://docs.docker.com/get-started/