** Description changed: - Ubuntu 14.04.3 (20150805) on Azure with cloud-init package - 0.7.5-0ubuntu1.8. + + [Impact] + Sometimes when rebooting an instance in Azure, a different ephemeral disk will be presented. Azure ephemeral disks are presented as NTFS disks, but we reformat them to ext4. With the last cloud-init upload, we shifted to using /dev/disk symlinks to mount these disks (in case they are not presented as the same physical device). Unfortunately, the code that determines if we have a new ephemeral disk was not updated to handle symlinks, so never detects a new disk. + + [Test Case] + 1) Boot an Azure instance and install the new cloud-init. + 2) Change the size of the instance using the Azure web interface (as this near-guarantees that the ephemeral disk will be replaced with a new one). This will reboot the instance. + 3) Once the instance is rebooted, SSH in and confirm that: + a) An ext4 ephemeral disk is mounted at /mnt, and + b) cloud-init.log indicates that a fabric formatted ephemeral disk was found on this boot. + + [Regression Potential] + Limited; two LOCs change, to dereference symlinks instead of using paths verbatim. + + [Original Report] + Ubuntu 14.04.3 (20150805) on Azure with cloud-init package 0.7.5-0ubuntu1.8. On Azure cloud-init prepares the ephemeral device as ext4 for the first boot. However, if the VM is ever moved to another Host for any reason, then a new ephemeral disk might be provided to the VM. This ephemeral disk is NTFS formatted, so for subsequent reboots cloud-init must detect and reformat the new disk as ext4. However, with cloud-init 0.7.5-0ubuntu1.8 subsequent boots may result in fuse mounted NTFS file system. This issue occurred in earlier versions of cloud-init, but was fixed with bug 1292648 (https://bugs.launchpad.net/ubuntu/+source/cloud- init/+bug/1292648). So this appears to be a regression. Repro: - - Create an Ubuntu 14.04.3 VM on Azure - - Resize the VM to a larger size (this typically moves the VM) - - Log in and run 'blkid' to show an ntfs formatted ephemeral disk: + - Create an Ubuntu 14.04.3 VM on Azure + - Resize the VM to a larger size (this typically moves the VM) + - Log in and run 'blkid' to show an ntfs formatted ephemeral disk: - # blkid - /dev/sdb1: LABEL="Temporary Storage" UUID="A43C43DD3C43A95E" TYPE="ntfs" - + # blkid + /dev/sdb1: LABEL="Temporary Storage" UUID="A43C43DD3C43A95E" TYPE="ntfs" Expected results: - - After resizing the ephemeral disk should be formatted as ext4. + - After resizing the ephemeral disk should be formatted as ext4.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1490796 Title: [SRU] cloud-init must check/format Azure ephemeral disks each boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1490796/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
