Public bug reported: When a KVM-based cloud instance is launched with ephemeral volume or swap space on a partition of the root disk (e.g., /dev/vda2 and /dev/vda3), the partition is ignored and remains unmounted. In the log this looks as follows:
Aug 12 19:29:45 euca-172-28-165-121 [CLOUDINIT] cc_mounts.py[DEBUG]: Attempting to determine the real name of ephemeral0 Aug 12 19:29:45 euca-172-28-165-121 [CLOUDINIT] DataSourceEc2.py[DEBUG]: Remapped device name /dev/sda2 => /dev/vda2 Aug 12 19:29:45 euca-172-28-165-121 [CLOUDINIT] cc_mounts.py[DEBUG]: Mapped metadata name ephemeral0 to /dev/vda2 Aug 12 19:29:45 euca-172-28-165-121 [CLOUDINIT] cc_mounts.py[DEBUG]: did not find entry for vda2 in /sys/block Aug 12 19:29:45 euca-172-28-165-121 [CLOUDINIT] cc_mounts.py[DEBUG]: Ignoring nonexistant default named mount ephemeral0 Aug 12 19:29:45 euca-172-28-165-121 [CLOUDINIT] cc_mounts.py[DEBUG]: Attempting to determine the real name of swap Aug 12 19:29:45 euca-172-28-165-121 [CLOUDINIT] DataSourceEc2.py[DEBUG]: Remapped device name /dev/sda3 => /dev/vda3 Aug 12 19:29:45 euca-172-28-165-121 [CLOUDINIT] cc_mounts.py[DEBUG]: Mapped metadata name swap to /dev/vda3 Aug 12 19:29:45 euca-172-28-165-121 [CLOUDINIT] cc_mounts.py[DEBUG]: did not find entry for vda3 in /sys/block Aug 12 19:29:45 euca-172-28-165-121 [CLOUDINIT] cc_mounts.py[DEBUG]: Ignoring nonexistant default named mount swap Earlier versions of cloud-init (e.g., one in Ubuntu 12.04) were able to use such partitions, but latter versions (e.g., one in Ubuntu 14.04) are not. It appears that a check for the block device's presence in /sys/block was added between those two versions and it is causing the failure. This check succeeds on AWS with paravirtualized instances, where what look like partitions (/dev/xvda1, /dev/xvda2, /dev/xvda3) of a disk (/dev/xvda), are actually separate, unrelated Xen-provided block devices, each with its own entry in /sys/block. When root, ephemeral, and swap block devices are actually partitions of one KVM disk (/dev/vda), they do not end up in /sys/block. This was discovered in a Eucalyptus installation: https://eucalyptus.atlassian.net/browse/EUCA-9251 ** Affects: cloud-init (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to cloud-init in Ubuntu. https://bugs.launchpad.net/bugs/1356494 Title: cloud-init does not recognize (and mount) ephemeral partition on KVM To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1356494/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
