[Linux-HA] HELP - debugging a hanging domU boot?

[Petri Asikainen]

Have you tried to mount/fsck  filesystem xvd from dom0?

For me this look like filesystem related issue. It's better to convert domu /boot partions to ext2 to prevent journal recovery related issues.


Miles Fidelman <mfidelman at meetinghouse.net> kirjoitti 28.10.2010 kello 15.45:

> Hi Folks,
> 
> I'm running (what's supposed to be) a 2-node high-availability 
> configuration consisting of:
> - Xen3.x
> - Debian Stable Dom0 on each node
> - DRBD
> - Pacemaker
> - several Debian Stable DomUs
> 
> One of my DomUs seems to have crashed and is stubbornly refusing to 
> boot.  On either node, it comes part way up and then hangs, with the 
> (virtual) console reporting:
> 
> ....
> [    2.387986] EXT3-fs: mounted filesystem with ordered data mode.
> Begin: Running /scripts/local-bottom ... done.
> done.
> Begin: Running /scripts/init-bottom ... done.
> INIT: version 2.86 booting
> Starting the hotplug events dispatcher: udevd[    5.467529] udevd 
> version 125 started
> .
> Synthesizing the initial hotplug events...done.
> Waiting for /dev to be fully populated...done.
> Starting boot logger: bootlogd[    6.190409] Adding 3145588k swap on 
> /dev/xvda2.  Priority:-1 extents:1 across:3145588k
> [   89.796051] EXT3 FS on xvda1, internal journal
> <hang>
> 
> I've also tried stopping it on one node, booting it on the other; reboot 
> the underlying nodes; etc.
> 
> The underlying RAID10 and DRBD arrays are reporting themselves as 
> healthy, and during the boot process DRBD seems to shift from secondary 
> to primary.
> 
> So....  I know how I might proceed if I were booting a physical machine 
> - try to come up in single user mode, failing that, boot with a live CD 
> and start examining things.  But with everything wired with CRM and Xen 
> in the middle of the boot process, I'm a little lost as to how to insert 
> myself into the domU  boot process for diagnostic purposes.
> 
> Any suggestions?
> 
> Thanks very much,
> 
> Miles Fidelman
> 
> p.s. What makes this particularly vexing is that the DomU that refuses 
> to come up has no purpose in life other than to handle nightly backups 
> of other domUs.  Sigh...
> 
> -- 
> In theory, there is no difference between theory and practice.
> In<fnord>  practice, there is.   .... Yogi Berra
> 
> 
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