At the moment, I'm hoping the issue really stems from this being an upgrade, and that a new instance that already had the newer version would be OK. What I believe is happening is: a.) old cloud-init on first boot writes /etc/fstab for the resource disk with something like: /dev/disk/cloud/azure_resource-part1 /mnt auto defaults,nofail,comment=cloudconfig 0 2 b.) apt-get install of new cloud-init c.) resize d.) new system boots with the /etc/fstab line show above. The fstab entry does not stop systemd from mounting the device, and the mount of the ntfs partition happens. cloud-init goes to format it, and mkfs.ext4 complains.
The new cloud-init writes an fstab entry with the options field as: defaults,nofail,x-systemd.requires=cloud-init.service,comment=cloudconfig I see some other paths that i'd like to clean up, including grabbing Daniel's merge proposal at [1], but I'm currently hopeful that the issue above is what we're seeing. We can test that theory by manually editing the /etc/fstab entry after first boot to include the options field above (specifically x-systemd.requires=cloud-init.service). -- [1] https://code.launchpad.net/~daniel-thewatkins/cloud-init/+git/cloud-init/+merge/310411 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1611074 Title: Reformatting of ephemeral drive fails on resize of Azure VM To manage notifications about this bug go to: https://bugs.launchpad.net/cloud-init/+bug/1611074/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs