[Openstack] Recover data after VM crash

Ben ben.div at gmail.com
Fri Oct 12 16:10:50 UTC 2012


Hi the list,

I have an instance in inconsistent state, and I would like to recover 
the data stored in.

The story : I had a very high load average on the instance, so I decided 
to reboot it with nova reboot command. The instance didn't went up (may 
be root fs corruption ?), so I tried to rescue it with nova rescue command.

Now when I try to start the instance, I see in the compute log an 
exception message telling that kernel.rescue file is not present. Same 
thing if I try to unrescue (playing with state in db to allow the command).

So I'm stuck with a probably broken image, in a broken rescue state.

Questions :
- how can I rescue or unrescue the instance ?
- how can I recover the data (by mounting instance file to browse its 
content ?)

Thanks

Ben




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