Public bug reported:
Hi,
This is a fresh install of Ubuntu 14.04 LTS AMD64. I tried configuring
a Ceph Rados Block Device (rbd) to be mounted during boot on
/var/lib/one, containing my OpenNebula configuration and database.
The idea being that should the machine go belly up, I'll have an up-to-
date snapshot of the OpenNebula data on Ceph to mount on the new
frontend machine.
/etc/ceph/rbdmap is configured, I set up /etc/fstab with an entry:
/dev/rbd/pool/rbdname /var/lib/one xfs defaults,_netdev 0 1
then rebooted. According to mount(8), _netdev is supposed to tell
mountall to skip mounting this device until the network is up.
As seen from the attached snapshot, it doesn't bother to wait, and
blindly tries to mount the RBD before connecting to Ceph: this will
never work.
mountall seems to rely on *knowing* a list of network file systems: this
means when someone comes up with a new network file system, or uses a
conventional disk file system with a remote block device, mountall's
heuristic falls flat on its face as has been demonstrated here. The
problem would also exist for iSCSI, AoE, FibreChannel, nbd and drbd
devices.
Due to bug 1313497, the keyboard is non-functional. Recovery is useless
as the keyboard is broken there too, and now the machine is waiting for
a keypress it will never see due to that bug. A headless system would
similarly have this problem.
Two suggestions I would have:
1. mountall should honour _netdev to decide whether to mount a device or not:
this gives the user the means to manually tell mountall that the device needs
network access to operate even if the filesystem looks to be local. I'd wager
that if the user specified _netdev, they probably meant it and likely know
better than mountall.
2. mountall should time out after a predefined period and NEVER wait
indefinitely: even if the disk is local. If a disk goes missing, then it is
better the machine tries to boot in its degraded state so it can be remotely
managed and raise an alarm, than to wait for someone to notice the machine
being down.
Unfortunately since the machine is now effectively bricked, I can only
grep proxy server logs to see what packages got installed.
mountall_2.53_amd64.deb seems to be the culprit.
** Affects: mountall (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "The end result: since the keyboard driver is stuffed,
this is where it hangs."
https://bugs.launchpad.net/bugs/1313513/+attachment/4099117/+files/IMG_20140428_154151.jpg
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https://bugs.launchpad.net/bugs/1313513
Title:
mountall does not honour _netdev
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