Open Stack

Hello,

Yes, You're right that make it with virsh will work only until next hard
reboot/stop/suspend/migrate of instance but I thought only about
changing flavor extra-specs and apply it to running vms with virsh :)
Also I think that updating flavor extra-specs can be probably done also
through nova API. Please check "nova flavor-key" command.

-- 
Best regards / Pozdrawiam
Sławek Kapłoński
slawek at kaplonski.pl

On Wed, 13 Jul 2016, Van Leeuwen, Robert wrote:

> >> Since the instance_extra flavor table is a big JSON blob it is a pain to apply changes there.
> >> Anybody found an easy way to do this?
> > If You are using virsh, You can apply such limits manually for each
> > instance. Check blkiotune command in virsh.
> 
> Using virsh is only for the running instances until the next reboot.
> This is because OpenStack will re-create the .xml file when you reboot an instance and any “local changes” made by virsh will be gone.
> 
> As I mentioned this info is not re-read from the flavor when the XML is created but it is stored per-instance in the instance_extra.flavor table.
> Luckily you can just overwrite the instance_extra.flavor with one with a quota applied to it and you do not need to parse and modify the JSON-BLOB. (the JSON-BLOB does not seem to contain unique data for the instance)
> 
> For future reference, the sql query will look something like this:
> update instance_extra set flavor='BIG JSON BLOB HERE' where instance_uuid IN ( SELECT uuid from instances where instances.instance_type_id='10' and instances.deleted='0') ;
> 
> This will update all active instances with the flavor-id of 10 (note that this flavor-id is an auto-increment id and not the flavor-id you use when creating a flavor)
> You can get the “JSON BLOB” from an instance which was created with the new  extra_specs settings applied to it.
> This setting will only be applied when you (hard)reboot the instance.
> When you want to instances without rebooting them you will ALSO need to to the virsh blkiotune part.
> 
> I’d gladly hear to any suggestions/tools for an easier way to do it.
> 
> Cheers,
> Robert van Leeuwen
> 
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