github.com/technosophos/deis@v1.7.1-0.20150915173815-f9005256004b/contrib/gce/gce-user-data-template (about)

     1  #cloud-config
     2  coreos:
     3    units:
     4      - name: format-ephemeral.service
     5        command: start
     6        content: |
     7          [Unit]
     8          Description=Formats the ephemeral drive
     9          ConditionPathExists=!/etc/gce-formatted
    10          [Service]
    11          Type=oneshot
    12          RemainAfterExit=yes
    13          ExecStart=/usr/sbin/wipefs -f /dev/disk/by-id/scsi-0Google_PersistentDisk_coredocker
    14          ExecStart=/usr/sbin/mkfs.ext4 -i 4096 -b 4096 /dev/disk/by-id/scsi-0Google_PersistentDisk_coredocker
    15          ExecStart=/bin/touch /etc/gce-formatted
    16      - name: var-lib-docker.mount
    17        command: start
    18        content: |
    19          [Unit]
    20          Description=Mount ephemeral to /var/lib/docker
    21          Requires=format-ephemeral.service
    22          After=format-ephemeral.service
    23          Before=docker.service
    24          [Mount]
    25          What=/dev/disk/by-id/scsi-0Google_PersistentDisk_coredocker
    26          Where=/var/lib/docker
    27          Type=ext4
    28      - name: docker.service
    29        drop-ins:
    30          - name: 90-after-docker-volume.conf
    31            content: |
    32              [Unit]
    33              Requires=var-lib-docker.mount
    34              After=var-lib-docker.mount