$ dpkg-query --show cloud-init
cloud-init 0.7.9-90-g61eb03fe-0ubuntu1~16.10.1
$ grep /mnt /proc/mounts
/dev/vdb1 /mnt ext4 rw,relatime,data=ordered 0 0
$ sudo blkid /dev/vdb1
/dev/vdb1: LABEL="mydata" UUID="20a0d834-2aca-450c-8d4d-a9e0a3fa74da"
TYPE="ext4" PARTUUID="4d3c51ff-449e-4497-9ddc-54143b531095"
$ echo $(date -R) hi mom | sudo tee -a /mnt/my-important-data.txt
Mon, 17 Apr 2017 14:21:07 +0000 hi mom
$ sudo rm -Rf /var/lib/cloud /var/log/cloud-init*
$ sudo reboot
...
# ssh back in
$ grep cc_disk_setup.py /var/log/cloud-init.log
2017-04-17 14:22:05,078 - stages.py[DEBUG]: Running module disk_setup (<module
'cloudinit.config.cc_disk_setup' from
'/usr/lib/python3/dist-packages/cloudinit/config/cc_disk_setup.py'>) with
frequency once-per-instance
2017-04-17 14:22:05,080 - cc_disk_setup.py[DEBUG]: setting up filesystems:
[{'label': 'mydata', 'partition': 'auto', 'device': '/dev/vdb', 'filesystem':
'ext4'}]
2017-04-17 14:22:05,166 - cc_disk_setup.py[DEBUG]: Creating new filesystem.
2017-04-17 14:22:05,166 - cc_disk_setup.py[DEBUG]: Checking /dev/vdb against
default devices
2017-04-17 14:22:05,166 - cc_disk_setup.py[DEBUG]: Identifying device to create
mydata filesytem on
2017-04-17 14:22:05,176 - cc_disk_setup.py[DEBUG]: Automatic device for
/dev/vdb identified as /dev/vdb1
2017-04-17 14:22:05,176 - cc_disk_setup.py[DEBUG]: Found filesystem match,
skipping formating.
$ cat /mnt/my-important-data.txt
Mon, 17 Apr 2017 14:21:07 +0000 hi mom
** Tags removed: verification-needed
** Tags added: verification-done-yakkety verification-needed-xenial
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https://bugs.launchpad.net/bugs/1634678
Title:
fs_setup always creates new filesystem with partition 'auto'
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https://bugs.launchpad.net/cloud-init/+bug/1634678/+subscriptions
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