✌️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:
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 [email protected]
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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