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    User data
    User data
    Updated on 16 May 2025
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    User data or Cloud-init automatically configures Bare Metal GPU servers after bootup. These scripts are generally used for the initial configuration of a server and run on the first boot. Deploying a server with user data allows you to run arbitrary commands and change several aspects of the server during provisioning.


    Here are a few examples of what you can do with user data scripts:

    Creating a user and installing basic packages

    #cloud-config
users:
  - name: cloud_user
    ssh_authorized_keys:
      - ssh-rsa AAAAB3Nz... user@domain
    sudo: "ALL=(ALL) NOPASSWD:ALL"
    groups: sudo
    shell: /bin/bash
packages:
  - git
  - htop

    What this script does:

    • Creates a user named cloud_user.
    • Adds an SSH key to allow secure remote login.
    • Installs packages like git (a version control tool) and htop (a system monitor). How you can test it:
      To login, you’ll want to use a command of this form:
    ssh -i /.ssh/id_rsa maas_user@10.192.226.195

    You can then test it further by running htop and trying out some git commands.

    Setting up SSH keys for multiple users

    #cloud-config
users:
  - default
  - name: user1
    ssh_authorized_keys:
      - ssh-rsa AAAAB3Nz... user1@domain
  - name: user2
    ssh_authorized_keys:
      - ssh-rsa AAAAB3Nz... user2@domain

    What this script does:

    • Sets up a default user.
    • Creates user1 and user2 with their own SSH keys for secure login.

    Installing Docker

    #cloud-config
packages:
  - docker.io
runcmd:
  - systemctl enable docker
  - systemctl start docker

    What this script does:

    • Installs Docker on the machine.
    • Enables and starts Docker to make sure it’s running whenever the machine boots up.
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