The GCE datasource gets its data from the internal compute metadata server. Metadata can be queried at the URL 'http://metadata.google.internal/computeMetadata/v1/
' from within an instance. For more information see the GCE metadata docs.
Currently the default project and instance level metadatakeys keys project/attributes/sshKeys
and instance/attributes/ssh-keys
are merged to provide public-keys
.
user-data
and user-data-encoding
can be provided to cloud-init by setting those custom metadata keys for an instance.