[SRU] Azure data source should auto-detect ephemeral disk location
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
cloud-init |
Fix Released
|
Undecided
|
Dan Watkins | ||
cloud-init (Ubuntu) |
Fix Released
|
Medium
|
Dan Watkins | ||
Precise |
Fix Released
|
Undecided
|
Dan Watkins | ||
Trusty |
Fix Released
|
Undecided
|
Dan Watkins | ||
Utopic |
Invalid
|
Undecided
|
Unassigned | ||
Vivid |
Fix Released
|
Medium
|
Dan Watkins | ||
walinuxagent (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Precise |
Fix Released
|
Undecided
|
Unassigned | ||
Trusty |
Fix Released
|
Undecided
|
Unassigned | ||
Utopic |
Fix Released
|
Undecided
|
Unassigned | ||
Vivid |
Fix Released
|
Undecided
|
Unassigned |
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).
Related branches
- cloud-init Commiters: Pending requested
-
Diff: 455 lines (+236/-86)8 files modifiedcloudinit/config/cc_disk_setup.py (+5/-0)
cloudinit/config/cc_mounts.py (+50/-64)
cloudinit/sources/DataSourceAzure.py (+23/-20)
packages/debian/dirs (+1/-0)
setup.py (+2/-0)
tests/unittests/test_datasource/test_azure.py (+4/-2)
tests/unittests/test_handler/test_handler_mounts.py (+133/-0)
udev/66-azure-ephemeral.rules (+18/-0)
- Chad Smith (community): Needs Fixing
- Hannes: Pending requested
-
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- JJ Asghar: Pending requested
- Diff: 0 lines
- Scott Moser: Pending requested
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Changed in cloud-init (Ubuntu): | |
assignee: | nobody → Ben Howard (utlemming) |
importance: | Undecided → Medium |
Changed in walinuxagent (Ubuntu): | |
assignee: | nobody → Ben Howard (utlemming) |
tags: | added: cpc-current-milestone |
Changed in cloud-init (Ubuntu): | |
assignee: | Ben Howard (utlemming) → Dan Watkins (daniel-thewatkins) |
Changed in cloud-init: | |
status: | New → In Progress |
assignee: | nobody → Dan Watkins (daniel-thewatkins) |
Changed in cloud-init (Ubuntu Vivid): | |
assignee: | Ben Howard (utlemming) → nobody |
summary: |
- Azure data source should auto-detect ephemeral disk location + [SRU] Azure data source should auto-detect ephemeral disk location |
description: | updated |
This looks like the correct problem statement - the SCSI layer schedules these tasks and so subtle timings could cause disk names to change. This is also we recommend UUIDs or labels or similar to be used in fstab.
The logic for DeviceForIdePort() is based on the fact that our vmbus driver at least knows the order of the disks (IDE or SCSI) that are attached on the Host side. And on Azure, the first IDE disk is always the OS disk, and the second is always the ephemeral disk. That is known and must be the case for all VMs.
So in the agent, DeviceForIdePor t()[0] always returns the OS disk, and DeviceForIdePor t()[1] always returns the ephemeral disk. Ideally cloud-init should use a similar method to auto-detect the ephemeral disk and update fstab if needed.
Thanks!