On trusty systems (at least), walinuxagent ships the udev rules to
produce the devices that cloud-init expects to find. So that isn't the
source of this bug.
Instead, the problem is that the Azure data source defaults to using
/dev/sdb for ephemeral0 ('disk_aliases': {'ephemeral0': '/dev/sdb'} at
[0]). Iff we detect a _fabric-formatted_ (i.e. NTFS) ephemeral disk,
then the data source updates this default to instead point at that
ephemeral disk (which will, correctly, be /dev/disk/azure/...). This
happens fine on every first boot, but on subsequent boots, we don't find
a fabric-formatted ephemeral disk (because we reformatted it on first
boot), so we don't update the default, so we end up rewriting the mounts
to point at /dev/sdb.
(I'll give fixing this some thought, and then comment again with
suggestions.)
[0]
https://git.launchpad.net/cloud-init/tree/cloudinit/sources/DataSourceAzure.py#n57
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https://bugs.launchpad.net/bugs/1603222
Title:
Azure: incorrect entry in fstab for ephemeral disk
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