I tested this latest fix and it looks good to me. The post-install fix seems to work and after multiple resizes I still see /mnt coming back as ext4
-> Pre-install $ dpkg -l | grep 'cloudinit ' ii cloud-init 0.7.8-1-g3705bb5-0ubuntu1~16.04.3 all Init scripts for cloud instances $ grep mnt /etc/fstab /dev/disk/cloud/azure_resource-part1 /mnt auto defaults,nofail,comment=cloudconfig 0 2 apt-get install cloud-init Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be upgraded: cloud-init 1 upgraded, 0 newly installed, 0 to remove and 45 not upgraded. Need to get 288 kB of archives. After this operation, 80.9 kB of additional disk space will be used. Get:1 http://azure.archive.ubuntu.com/ubuntu xenial-proposed/main amd64 cloud-init all 0.7.8-49-g9e904bb-0ubuntu1~16.04.1 [288 kB] Fetched 288 kB in 0s (651 kB/s) Preconfiguring packages ... (Reading database ... 61252 files and directories currently installed.) Preparing to unpack .../cloud-init_0.7.8-49-g9e904bb-0ubuntu1~16.04.1_all.deb ... Unpacking cloud-init (0.7.8-49-g9e904bb-0ubuntu1~16.04.1) over (0.7.8-1-g3705bb5-0ubuntu1~16.04.3) ... Processing triggers for ureadahead (0.100.0-19) ... Setting up cloud-init (0.7.8-49-g9e904bb-0ubuntu1~16.04.1) ... Installing new version of config file /etc/cloud/cloud.cfg ... Leaving 'diversion of /etc/init/ureadahead.conf to /etc/init/ureadahead.conf.disabled by cloud-init' cloud-init postinst fixed /etc/fstab for x-systemd.requires -> Post-install $ dpkg -l | grep 'cloudinit ' ii cloud-init 0.7.8-49-g9e904bb-0ubuntu1~16.04.1 all Init scripts for cloud instances $ grep mnt /etc/fstab /dev/disk/cloud/azure_resource-part1 /mnt auto defaults,nofail,x-systemd.requires=cloud-init.service,comment=cloudconfig 0 2 -> After Resize /dev/sdb1 ext4 281G 63M 267G 1% /mnt -> After another resize /dev/sdb1 ext4 596G 70M 566G 1% /mnt -> After yet another resize /dev/sdb1 ext4 69G 52M 66G 1% /mnt -- 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