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Sergei Hanus's profile - activity

2014-10-14 08:47:16 -0600 answered a question HA configuration for nova-compute nodes

As of now - I didn't find any built-in, automatical way to do that.

There's a method (api call)- evacuate, which allows to manually cold-migrate all vms from one host to another. But, it requires some external entity to call it (some kind of script or management system). And, as far as I know, in Icehouse there's particular problem with that - machines can be evacuated only when correctly shutdown. And, this is definitely not the case when node fails - all vms will be in error state. I read some blueprint, which pointed, that this behavior could hopefully be solved in Juno - but I didn't have a chance to verify this change.

2014-09-09 10:20:16 -0600 answered a question Does open stack support HA, vMotion, Storage vMotion in similar way as Vmware?

I would answer in the following way: vmotion is supported (called live migration). You can find some references in the internet on how to achieve that, main requirement - shared storage (although, non-shared also promosed to be supported, but I didn't try it personally). For example, this article - - describes live migration.

HA - as far as I know, there is no option in GUI for that, but there's a command "evacuate", which can be ecexuted via API or directly from CLI.

Unfortunately, don't have any info for storage vmotion - but, my opinion - as soon as you have distributed storage (like gluster or ceph) - you might not need this feature.

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2014-08-25 10:46:46 -0600 commented answer Nova compute stays up (state :-) )even after host shutdown

Your guess led me to the check-in timer. I took a look at nova.conf - and found out, that by some reason service_down_time parameter was set to 100000. I think, because of that controller needed to wait a lot of time before realizing that compute is dead. I changed it to 30 - it's working fine now.

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2014-08-25 03:13:59 -0600 commented answer Nova compute stays up (state :-) )even after host shutdown

Thanks for advice. Really, I had time shift right after installation of all components. Later I noticed it and synced everything, but even after rebooting situation didn't change. If you have such guess - maybe, there's some way to "synchronize" all components agein inside openstack?

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