This is as expected, the root partition in the registered image will not
match the size of the disk that is deployed. It will be large enough to
contain the root partition and provide some blank space. This is by
design and allows VMs to be started with variable size disks. This is
seen early in boot before cloud-init runs and because the disk from the
image builder is smaller it will leave the gpt backup table in the
middle of the deployed disk, but this is safe. One of the early cloud-
init modules is growpart[1] and there's good documentation in the link
for that module, but by default that module will grow the partition for
the root filesystem to fill the disk and then grow the filesystem to
fill that partition. In doing this the gpt backup table will be moved
to a location correct for the root disk size at deployemtn; this is why
you don't see the warning after reboot. In addition to giving
flexibility for launching with different size root disks the user can
instruct cloud-init not to resize the root filesystem[2][3] and instead
use the unused space to create other partitions and filesystems[4].
[1] https://git.launchpad.net/cloud-init/tree/cloudinit/config/cc_growpart.py
[2] https://cloudinit.readthedocs.io/en/latest/topics/modules.html#growpart
[3] https://cloudinit.readthedocs.io/en/latest/topics/modules.html#resizefs
[4] https://cloudinit.readthedocs.io/en/latest/topics/modules.html#disk-setup
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https://bugs.launchpad.net/bugs/1828101
Title:
[linux-azure] Disk Partition Issue
Status in linux-azure package in Ubuntu:
New
Bug description:
In testing with the “Canonical UbuntuServer 19.04 latest” image from
the Azure Marketplace, we’re seeing these lines output in dmesg:
lisa@LISAv2-OneVM8NIC-v-stlups-AQ63-20190507075423-role-0:~$ dmesg | grep GPT
[ 17.228278] GPT:Primary header thinks Alt. header is not at the end of the
disk.
[ 17.237240] GPT:4612095 != 62914559
[ 17.259079] GPT:Alternate GPT header not at the end of the disk.
[ 17.259080] GPT:4612095 != 62914559
[ 17.259080] GPT: Use GNU Parted to correct GPT errors.
It looks like maybe the disk partition structure in the image isn’t
quite correct. Linux continues to boot, and the reported errors don’t
cause any obvious problems, but it seems like this is something that
should be corrected.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1828101/+subscriptions
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