Atlas Docs

User Data Library

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descriptionExplains how to use cloud-init user data to configure instances on first boot.

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User Data

User Data in Atlas Cloud lets you automatically configure a virtual machine during its first boot. This is useful for tasks like:

  • Adding users and SSH keys
  • Installing software packages
  • Configuring services or network settings
  • Bootstrapping management agents

Example User Data

#cloud-config
users:
  - name: deploy
    groups: sudo
    shell: /bin/bash
    ssh-authorized-keys:
      - ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC0...
 
package_update: true
package_upgrade: true
 
runcmd:
  - echo "Welcome to Atlas Cloud!" > /etc/motd
  - apt-get install -y curl vim
  • Creates a deploy user with sudo privileges.
  • Adds the specified SSH key for secure login.
  • Updates and upgrades all system packages.
  • Installs curl and vim.
  • Writes a welcome message to /etc/motd.

If your template doesn’t use cloud-init, you can provide a simple script:

#!/bin/bash
useradd -m deploy -s /bin/bash
mkdir -p /home/deploy/.ssh
echo "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC0..." > /home/deploy/.ssh/authorized_keys
chown -R deploy:deploy /home/deploy/.ssh
chmod 700 /home/deploy/.ssh
chmod 600 /home/deploy/.ssh/authorized_keys
echo "Welcome to Atlas Cloud!" > /etc/motd

User data is an excellent way to bootstrap your new instance.

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