#cloud-config merge_how: dict(recurse_array)+list(append) write_files: - path: /etc/systemd/system/$SERVICE-failure.service owner: "root:root" permissions: "0644" content: | [Unit] Description=$SERVICE Failure Notifier [Service] Type=simple TimeoutStartSec=0 ExecStart=/usr/bin/curl -sf -X PUT -H 'Content-Type: application/json' \ --data-binary '{"Status": "FAILURE", "Reason": "$SERVICE service failed to start.", "Data": "OK", "UniqueId": "00000"}' \ "$WAIT_HANDLE"