Calling this fix released.
** Changed in: cloud-init
Status: In Progress => 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:
Fix Released
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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