Open Stack

Hi,

> My question is this: Can I shutdown the VMs, rebuild the compute  
> nodes, and then relaunch the VMs?

Why shut them down? You could just migrate (cold or live) them to  
other compute nodes and maintain your compute nodes one by one, this  
would be possible without downtime.

Depending on your storage backend (if the disks and volumes do not  
reside on the compute nodes) rebooting instances on upgraded compute  
nodes should be no problem at all. The configuration of the instances  
are in the database, and if the compute nodes don't have existing xml  
files, they will be simply recreated.
Before our live migration worked I had to deal with some compute node  
issues and changed the hosting compute node of some instances directly  
in the database, and the instances came back up. So I don't see an  
issue there, always under the prerequisite that the compute  
configuration is correct and the storage backend is accessible by the  
compute nodes, of course.

Hope this helps!


Zitat von Father Vlasie <fv at spots.school>:

> Hello everyone,
>
> I have a couple of compute nodes that need HD upgrades. They are  
> running VMs with Cinder volumes.
>
> My question is this: Can I shutdown the VMs, rebuild the compute  
> nodes, and then relaunch the VMs?
>
> I am thinking “yes” because the volumes are not ephemeral but I am not sure.
>
> Are there any VM specific data that I need to save from the compute nodes?
>
> Thank you,
>
> FV
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