Install docker engine on Ubuntu

We will install docker engine on our Ubuntu Jammy 22.04 (LTS) Virtual Machine using the repository.

Info

Full instructions are available at https://docs.docker.com/engine/install/

Setup the repository

1. Update the apt package index and install packages to allow apt to use a repository over HTTPS:

   sudo apt-get update
   
   sudo apt-get install \
       ca-certificates \
       curl \
       gnupg \
   

2. Add Docker’s official GPG key:

    sudo mkdir -p /etc/apt/keyrings
    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
   

3. Use the following command to set up the repository:

   echo \
     "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
     "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
     sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
   

Install Docker Engine

Update the apt package index, and install the latest version of Docker Engine, containerd, and Docker Compose, or go to the next step to install a specific version:

 sudo apt-get update
 sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Post-installation steps

The Docker daemon binds to a Unix socket instead of a TCP port. By default that Unix socket is owned by the user root and other users can only access it using sudo. The Docker daemon always runs as the root user.

If you don’t want to preface the docker command with sudo, add users to the Unix group docker. When the Docker daemon starts, it creates a Unix socket accessible by members of the docker group.

• Add your user to the docker group.

sudo usermod -aG docker $USER

• Log out and log back in so that your group membership is re-evaluated.

Verify

CommandExample output

docker --version

Docker version 24.0.5, build ced0996