Works on FCOS and RHCOS. "device: /dev/vda" depends on the device we are using, maybe vda, sda, xvda

Ignition Partition File

variant: fcos
version: 1.1.0
passwd:
  users:
    - name: core
      ssh_authorized_keys:
        - ssh-rsa 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 jingzhan@localhost.localdomain
storage:
  disks:
    - device: /dev/vda
      partitions:
        - number: 0
          label: var-log
          size_mib: 0
          start_mib: 0
  filesystems:
    - device: /dev/disk/by-partlabel/var-log
      path: /var/log
      format: xfs
      wipe_filesystem: true
      with_mount_unit: true