These files allow to install a Rudder agent automatically using cloud-init. All you need to do to use them is set the user-data field in your cloud provider to contain "#include" on one line, and the URL to the raw version of this script on the second line. Assuming you're using an image with cloud-init pre-installed, your new instance will spin…

install-rudder-agent-rpm-latest.yml

#cloud-config

# Set up the package repository to get Rudder.
# We use the "latest" pseudo-version name to always get an up-to-date agent.
yum_repos:
  - rudder-latest:
      baseurl: http://www.rudder-project.org/rpm-latest/RHEL_7/
      enabled: true
      gpgcheck: true
      gpgkey: http://www.rudder-project.org/packages.gpg.key
      name: Rudder latest repo

# Install the agent itself
packages:
  - rudder-agent

# Tell the agent which server to contact
write-files:
  - path: /var/rudder/cfengine-community/policy_server.dat
    content: rudder.my-company.com
    owner: root:root
    permissions: '0640'

# Fire it up the first time so it's ready to roll!
runcmd:
  - rudder agent run