[ovirt-devel] OST: HE vm does not restart on HC setup

[Francesco Romani]

On 02/22/2017 01:53 PM, Simone Tiraboschi wrote:
>
>
> On Wed, Feb 22, 2017 at 1:33 PM, Simone Tiraboschi
> <stirabos at redhat.com <mailto:stirabos at redhat.com>> wrote:
>
>     When ovirt-ha-agent checks the status of the engine VM we get:
>
>     2017-02-21 22:21:14,738-0500 ERROR (jsonrpc/2) [api] FINISH getStats error=Virtual machine does not exist: {'vmId': u'2ccc0ef0-cc31-45b8-8e91-a78fa4cad671'} (api:69)
>     Traceback (most recent call last):
>       File "/usr/lib/python2.7/site-packages/vdsm/common/api.py", line 67, in method
>         ret = func(*args, **kwargs)
>       File "/usr/share/vdsm/API.py", line 335, in getStats
>         vm = self.vm
>       File "/usr/share/vdsm/API.py", line 130, in vm
>         raise exception.NoSuchVM(vmId=self._UUID)
>     NoSuchVM: Virtual machine does not exist: {'vmId': u'2ccc0ef0-cc31-45b8-8e91-a78fa4cad671'}
>
>     While in ovirt-ha-agent logs we have:
>
>     MainThread::INFO::2017-02-21 22:21:18,583::hosted_engine::453::ovirt_hosted_engine_ha.agent.hosted_engine.HostedEngine::(start_monitoring) Current state UnknownLocalVmState (score: 3400)
>
>     ...
>
>     MainThread::INFO::2017-02-21 22:21:31,199::state_decorators::25::ovirt_hosted_engine_ha.agent.hosted_engine.HostedEngine::(check) Unknown local engine vm status no actions taken
>
>     Probably it's a bug or a regression somewhere on master.
>
> On ovirt-ha-broker side the detection is based on a strict string
> match on the error message that is expected to be exactly 'Virtual
> machine does not exist' to set down status otherwise we set unknown
> status as in this case:
> https://gerrit.ovirt.org/gitweb?p=ovirt-hosted-engine-ha.git;a=blob;f=ovirt_hosted_engine_ha/broker/submonitors/engine_health.py;h=d633cb860b811e84021221771bf706a9a4ac1d63;hb=refs/heads/master#l54
>
>  
> Adding Francesco here to understand if something has recently changed
> there on vdsm side.
It has changed indeed; we had a series of changes which added context to
some exceptions. I believe the straw who broke the camel's back was
I32ec3f86f8d53f8412f4c0526fc85e2a42e30ea5 It is unfortunate that this
change broke HA. Could you perhaps fixing it checking that the message
*begins* with that string, and/or checking the error code. bests,

-- 
Francesco Romani
Red Hat Engineering Virtualization R & D
IRC: fromani
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