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User data

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:

  1. Creates a user named cloud_user.
  2. Adds an SSH key to allow secure remote login.
  3. 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:

  1. Sets up a default user.
  2. 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:

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

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