Vendor Data

The OpenStack metadata server can be configured to serve up vendor data which is available to all instances for consumption. OpenStack vendor data is, generally, a JSON object.

cloud-init will look for configuration in the cloud-init attribute of the vendor data JSON object. cloud-init processes this configuration using the same handlers as user data, so any formats that work for user data should work for vendor data.

For example, configuring the following as vendor data in OpenStack would upgrade packages and install htop on all instances:

{"cloud-init": "#cloud-config\npackage_upgrade: True\npackages:\n - htop"}

For more general information about how cloud-init handles vendor data, including how it can be disabled by users on instances, see Vendor Data.