File: //etc/cloud/cloud.cfg.d/91-gce-system.cfg
datasource_list: [ GCE ]
system_info:
   package_mirrors:
     - arches: [i386, amd64]
       failsafe:
         primary: http://archive.ubuntu.com/ubuntu
         security: http://security.ubuntu.com/ubuntu
       search:
         primary:
           - http://%(region)s.gce.archive.ubuntu.com/ubuntu/
           - http://%(availability_zone)s.gce.clouds.archive.ubuntu.com/ubuntu/
           - http://gce.clouds.archive.ubuntu.com/ubuntu/
         security: []
     - arches: [armhf, armel, default]
       failsafe:
         primary: http://ports.ubuntu.com/ubuntu-ports
         security: http://ports.ubuntu.com/ubuntu-ports