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[James Falcon <1779207@xxxxxxxxxxxxxxxxxx>]

Tracked in Github Issues as https://github.com/canonical/cloud-
init/issues/3201

** Bug watch added: github.com/canonical/cloud-init/issues #3201
   https://github.com/canonical/cloud-init/issues/3201

** Changed in: cloud-init
       Status: Triaged => Expired

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https://bugs.launchpad.net/bugs/1779207

Title:
  Failed mount of '/dev/sdb1' with Swap File cloud-init config

Status in cloud-init:
  Expired

Bug description:
  Environment : RHEL 7.5 on Azure, using cloud-init 18.2 rebase with
  these patches: https://git.launchpad.net/cloud-
  init/commit/?id=aa4eeb80

  Scenario:
  I provision an image with the above on Azure, in addition, i apply this cloud-init config:
  #cloud-config
  disk_setup:
      ephemeral0:
          table_type: gpt
          layout: [66, [33, 82]]
          overwrite: True
  fs_setup:
      - device: ephemeral0.1
        filesystem: ext4
      - device: ephemeral0.2
        filesystem: swap
  mounts:
      - ["ephemeral0.1", "/mnt"]
      - ["ephemeral0.2", "none", "swap", "sw", "0", "0"]

  The VM provisions successfully, you see /sdb1 gets mounted and the
  swap file config succeeds.

  If i deallocate the VM and start it, /sdb1 does not get mounted, you
  see the errors below.

  2018-06-20 19:50:38,138 - util.py[WARNING]: Failed reading the partition table Unexpected error while running command.
  Command: ['/usr/sbin/blockdev', '--rereadpt', '/dev/sdb']
  Exit code: 1
  Reason: -
  Stdout:
  Stderr: blockdev: ioctl error on BLKRRPART: Device or resource busy
  2018-06-20 19:50:38,138 - util.py[DEBUG]: Failed reading the partition table Unexpected error while running command.
  Command: ['/usr/sbin/blockdev', '--rereadpt', '/dev/sdb']
  Exit code: 1
  Reason: -
  Stdout:
  Stderr: blockdev: ioctl error on BLKRRPART: Device or resource busy
  Traceback (most recent call last):
    File "/usr/lib/python2.7/site-packages/cloudinit/config/cc_disk_setup.py", line 685, in read_parttbl
      util.subp(blkdev_cmd)
    File "/usr/lib/python2.7/site-packages/cloudinit/util.py", line 1958, in subp
      cmd=args)
  ProcessExecutionError: Unexpected error while running command.

  Running multiple deallocates and starts does not see the system
  resolve itself.

  I check fstab:
  UUID=6e4681f0-1ec3-4c27-9c16-afb90a4c4513 /                       xfs     defaults        0 0
  UUID=f2116236-4be6-4b72-b107-c2d7a68688c4 /boot                   xfs     defaults        0 0
  /dev/disk/cloud/azure_resource-part1    /mnt    auto    defaults,nofail,x-systemd.requires=cloud-init.service,comment=cloudconfig       0       2
  /dev/disk/cloud/azure_resource-part2    none    swap    sw,comment=cloudconfig  0       0

  As a test, i changed the FSTAB entry for the swap to add a dependency on cloud-init:
  /dev/disk/cloud/azure_resource-part2    none    swap    sw,nofail,x-systemd.requires=cloud-init.service,comment=cloudconfig     0       0

  I deallocated and started the VM, sdb mounts correctly, but the FSTAB
  is overwritten for swap with the  previous config. I modified the
  FSTAB again, with the addition, then rebooted, again, everything
  works.

  Does azure_resource-part2 need a dependency like azure_resource-part1?

  You can also test this using the existing Azure cloud-init preview images (cloud-init 0.7.9.x)
  az vm create
  --resource-group rgName
  --name vmName
  --image RedHat:RHEL:7-RAW-CI:latest
  --admin-username anotherusr
  --custom-data /../swapconfig.txt
  --ssh-key-value /.../my.pub

  az vm deallocate --resource-group rgName --name vmName
  az vm start --resource-group rgName --name vmName

  Thanks,

  Related bugs:
   * bug 1785354: /etc/fstab: fs_passno is 0 for all file systems

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