This bug was fixed in the package cloud-init - 0.7.5-0ubuntu1.8
---------------
cloud-init (0.7.5-0ubuntu1.8) trusty; urgency=medium
* debian/patches/lp-1411582-azure-udev-ephemeral-disks.patch:
- Use udev rules to discover ephemeral disk locations rather than
hard-coded device names (LP: #1411582).
* debian/patches/lp-1470880-fix-gce-az-determination.patch:
- Correctly parse GCE's availability zones (LP: #1470880).
* d/patches/lp-1470890-include-regions-in-dynamic-mirror-discovery.patch:
- Make %(region)s a valid substitution in mirror discovery
(LP: #1470890).
* Remove python-serial from Build-Depends; it was mistakenly added last
upload.
-- Daniel Watkins <[email protected]> Fri, 14 Aug 2015
13:54:02 +0100
** Changed in: cloud-init (Ubuntu Trusty)
Status: Fix Committed => Fix Released
** Changed in: cloud-init (Ubuntu Vivid)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1411582
Title:
[SRU] Azure data source should auto-detect ephemeral disk location
Status in cloud-init:
In Progress
Status in cloud-init package in Ubuntu:
Fix Released
Status in walinuxagent package in Ubuntu:
Fix Released
Status in cloud-init source package in Precise:
Fix Released
Status in walinuxagent source package in Precise:
Fix Released
Status in cloud-init source package in Trusty:
Fix Released
Status in walinuxagent source package in Trusty:
Fix Released
Status in cloud-init source package in Utopic:
Invalid
Status in walinuxagent source package in Utopic:
Fix Released
Status in cloud-init source package in Vivid:
Fix Released
Status in walinuxagent source package in Vivid:
Fix Released
Bug description:
[Impact]
The Azure ephemeral disk will not necessarily remain at the same /dev/sd*
location between reboots. This means the drive may not be persistently mounted
between reboots.
[Test Case]
1) Boot an Azure instance with a cloud-init including this fix.
2) Ensure that the ephemeral disk is mounted at /mnt and formatted as ext4
3) Ensure that /etc/fstab refers to a /dev/disk/... symlink, rather than a
/dev/sd* device.
[Regression Potential]
We now use a udev rule to discover the location of the disk; we have been
assured by Microsoft that this rule will always work, so regression potential
is minimal.
[Original Report]
Currently we assume it will be /dev/sdb, but this may change. There is an
example of how to handle this in the Azure Linux agent.
To quote stevez in a comment on bug 1410835:
Device names are not persistent in Linux and could change, so it is
not guaranteed that the ephemeral disk will be called /dev/sdb.
Ideally this should be auto-detected in cloud-init at runtime (for
example, see DeviceForIdePort() in the Azure Linux agent).
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