Install Docker — SuperComputing.dk

Open a Terminal

On each Pi, open a terminal window: press Ctrl + Alt + T

Run the Convenience Script

Install Docker (run on every node)

$ sudo curl -fsSL https://get.docker.com -o get-docker.sh
$ sudo sh get-docker.sh

The script will automatically detect your OS (Raspbian/Debian), add Docker's apt repository and install the Docker Engine. The process takes a few minutes per node.

Add Your User to the Docker Group

To run Docker commands without sudo, add your user to the docker group:

Add user to docker group (run on every node)

$ sudo usermod -aG docker $USER

Log out and back in for the change to take effect.

⚠️

Security note: Members of the docker group can obtain root privileges via Docker containers. Only add trusted users. See the Docker security documentation for details.

Verify the Installation

Verify Docker version

$ docker version
Client: Docker Engine - Community
 Version:           27.x.x
 OS/Arch:           linux/arm64
 ...

Server: Docker Engine - Community
 Engine:
  Version:          27.x.x
  OS/Arch:          linux/arm64
  ...

Repeat on All Nodes

You must install Docker on all four nodes — MASTER, SLAVE1, SLAVE2 and SLAVE3. Connect to each via VNC or SSH and run the same two commands.

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Official installation reference: docs.docker.com — Install using the convenience script