Public bug reported:
After resizing a 16.04 VM on Azure, the VM is presented with a new
ephemeral drive (of a different size), which initially is NTFS
formatted. Cloud-init tries to format the appropriate partition ext4,
but fails because it is mounted. Cloud-init has unmount logic for
exactly this case in the get_data call on the Azure data source, but
this is never called because fresh cache is found.
Jun 27 19:07:47 azubuntu1604arm [CLOUDINIT] handlers.py[DEBUG]: start:
init-network/check-cache: attempting to read from cache [trust]
Jun 27 19:07:47 azubuntu1604arm [CLOUDINIT] util.py[DEBUG]: Reading from
/var/lib/cloud/instance/obj.pkl (quiet=False)
Jun 27 19:07:47 azubuntu1604arm [CLOUDINIT] util.py[DEBUG]: Read 5950 bytes
from /var/lib/cloud/instance/obj.pkl
Jun 27 19:07:47 azubuntu1604arm [CLOUDINIT] stages.py[DEBUG]: restored from
cache: DataSourceAzureNet [seed=/dev/sr0]
Jun 27 19:07:47 azubuntu1604arm [CLOUDINIT] handlers.py[DEBUG]: finish:
init-network/check-cache: SUCCESS: restored from cache: DataSourceAzureNet
[seed=/dev/sr0]
...
Jun 27 19:07:48 azubuntu1604arm [CLOUDINIT] cc_disk_setup.py[DEBUG]: Creating
file system None on /dev/sdb1
Jun 27 19:07:48 azubuntu1604arm [CLOUDINIT] cc_disk_setup.py[DEBUG]: Using
cmd: /sbin/mkfs.ext4 /dev/sdb1
Jun 27 19:07:48 azubuntu1604arm [CLOUDINIT] util.py[DEBUG]: Running command
['/sbin/mkfs.ext4', '/dev/sdb1'] with allowed return codes [0] (shell=False,
capture=True)
Jun 27 19:07:48 azubuntu1604arm [CLOUDINIT] util.py[DEBUG]: Creating fs for
/dev/disk/cloud/azure_resource took 0.052 seconds
Jun 27 19:07:48 azubuntu1604arm [CLOUDINIT] util.py[WARNING]: Failed during
filesystem operation#012Failed to exec of '['/sbin/mkfs.ext4',
'/dev/sdb1']':#012Unexpected error while running command.#012Command:
['/sbin/mkfs.ext4', '/dev/sdb1']#012Exit code: 1#012Reason: -#012Stdout:
''#012Stderr: 'mke2fs 1.42.13 (17-May-2015)\n/dev/sdb1 is mounted; will not
make a filesystem here!\n'
$ lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04
$ cat /etc/cloud/build.info
build_name: server
serial: 20160721
~$ dpkg -l cloud-init
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture
Description
+++-================================-=====================-=====================-=====================================================================
ii cloud-init 0.7.7~bzr1256-0ubuntu all
Init scripts for cloud instances
We're seeing ~100% repro of this bug on resize, where the only success
cases are caused by another bug that messes up fstab and prevents
mounting of the drive.
** Affects: cloud-init (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "cloud-init.log"
https://bugs.launchpad.net/bugs/1611074/+attachment/4716876/+files/cloud-init.log
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https://bugs.launchpad.net/bugs/1611074
Title:
Reformatting of ephemeral drive fails on resize of Azure VM
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