GPT formatted ephemeral disks have two partitions (unfortunately). The
first is the Microsoft reserved partition
(https://en.wikipedia.org/wiki/Microsoft_Reserved_Partition). This
appears to be tripping up can_dev_be_reformatted().
Function address_ephemeral_resize() will first check if
is_new_instance=True, and if so it will happily format the ephemeral
disk. That's why this works at first boot.
For subsequent boots where is_new_instance=False,
address_ephemeral_resize() will call can_dev_be_reformatted(). This
function sees that the ephemeral disk has two partitions and returns
false:
if os.path.exists(devpath + suff + "2"):
msg = ('device %s had more than 1 partition: %s, %s' %
devpath, cand, devpath + suff + "2")
return False, msg
We also end up with the following TypeError in the logs:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 647, in
status_wrapper
ret = functor(name, args)
File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 415, in
main_init
init.activate_datasource()
File "/usr/lib/python3/dist-packages/cloudinit/stages.py", line 369, in
activate_datasource
is_new_instance=self.is_new_instance())
File "/usr/lib/python3/dist-packages/cloudinit/sources/DataSourceAzure.py",
line 251, in activate
address_ephemeral_resize(is_new_instance=is_new_instance)
File "/usr/lib/python3/dist-packages/cloudinit/sources/DataSourceAzure.py",
line 329, in address_ephemeral_resize
result, msg = can_dev_be_reformatted(devpath)
File "/usr/lib/python3/dist-packages/cloudinit/sources/DataSourceAzure.py",
line 279, in can_dev_be_reformatted
devpath, cand, devpath + suff + "2")
TypeError: not enough arguments for format string
.
.
Aside from the TypeError, even if we comment this part there is a later check
to ensure that this partition is NTFS formatted (which it isn't). This will
also return false and you will see the following error in the logs:
"reformattable=False: partition 1 (/dev/disk/cloud/azure_resource-part1
-> /dev/sdb1) on device /dev/disk/cloud/azure_resource was not ntfs
formatted"
I think the correct behavior should be for cloud-init to detect that
this is a GPT formatted ephemeral disk, or check that azure_resource-
part1 is a "Microsoft reserved partition". And if so skip
azure_resource-part1 and focus on azure_resource-part2 instead to
determine if it is safe to reformat.
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https://bugs.launchpad.net/bugs/1686514
Title:
Azure: cloud-init does not handle reformatting GPT partition ephemeral
disks
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