Install Docker on Ubuntu 16.04

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Install Docker on Ubuntu 16.04

 Docker Engine is an open-source containerization technology for building and containerizing your applications. Docker Engine acts as a client-server application with:
  • A server with a long-running daemon process dockerd.
  • APIs which specify interfaces that programs can use to talk to and instruct the Docker daemon.
  • A command-line interface (CLI) client docker.
To install Docker on your Ubuntu 16.04 machine, follow the following steps.
  • Install Dependent packages:  Update the package index and install packages to allow apt to use a repository over HTTPS.
    • sudo apt-get update
        sudo apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common

  • Add repository key:  Add repository key to the package manager
    • curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
  • Verify fingerprint:  Verify that you now have the key with the fingerprint
    • sudo apt-key fingerprint 0EBFCD88
  • Add stable repo for docker: Add stable repository and update the package index.
    • sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
        sudo apt-get update

  • Check the package availability:  Check availability of the docker-ce package
    • apt-cache madison docker-ce
    apt-cache policy docker-ce
  • Install the packages:  Install docker CE, docker CLI, and containerd.io
    • sudo apt-get install docker-ce docker-ce-cli containerd.io
  • Check the docker version and status: Verify the successful installation and the version of the installed package and status of the docker service.
    • docker --version
        sudo systemctl status docker
  • Add your user to the docker group:  Add your user to the docker group and run su - ${USER} to make it in effect alternatively, you can restart your machine.
    • sudo groupadd docker
    su - ${USER}
  • Download docker-compose:  Download docker-compose and keep it in /usr/local/bin folder. 
    • sudo curl -L "https://github.com/docker/compose/releases/download/1.25.5/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
  • Make it executable:  Add execute permission to the downloaded docker-compose file/
    • sudo chmod +x /usr/local/bin/docker-compose
  • Verify installation:  Verify the successful installation and the version of the docker-compose
    • docker-compose --version

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