openstack team mailing list archive

[Christian Parpart <trapni@xxxxxxxxx>]

Hey,

well, I said "I might be wrong" because I have no "clear" vision on how
OpenStack works in
its deepest detail, however, I would not like to depend on a controller
node that
is inside a virtual machine, controlled by compute nodes, that are
controlled by the controller
node. This sounds quite like a chicken-and-egg problem.

However, at the time of this writing, I think you'll have to have a working
nova-scheduler process,
which is responsible on deciding on which compute node to spawn your VM
(what else?),
and think about what you do when this (or all your controller-)VMs terribly
die,
and you want to rebuild it, how do you plan to do this when your controller
node is out-of-service?

I in my case have put the controller services onto two compute nodes, and
use Pacemaker
to switch between them, in case one node goes down, the other can take over
(via shared service-IP).

Again, these are my thoughts, and I am using OpenStack for just about a
month now :-)
But I hope this helps a bit...

Best regards,
Christian Parpart.

On Fri, Jun 15, 2012 at 8:16 AM, Igor Laskovy <igor.laskovy@xxxxxxxxx>wrote:

> Why? Can you please clarify.
>
> Igor Laskovy
> facebook.com/igor.laskovy
> Kiev, Ukraine
> On Jun 15, 2012 1:55 AM, "Christian Parpart" <trapni@xxxxxxxxx> wrote:
>
>> I don't think putting the controller node completely into a VM is a good
>> advice,
>> at least when speaking of nova-scheduler and nova-api (if central).
>>
>> I may be wrong, and if so, please correct me.
>>
>> Christian.
>>
>> On Thu, Jun 14, 2012 at 7:20 PM, Igor Laskovy <igor.laskovy@xxxxxxxxx>wrote:
>>
>>> Hi, have any updates there?
>>> Can anybody clarify what happens if controller nodes just going hard
>>> shutdown?
>>>
>>> I thinking about solution with two hypervisors and putting controller
>>> node in VM shared storage, which can be relaunched when active
>>> hypervisor will die.
>>> Any ideas, advise?
>>>
>>>
>>> On Tue, Jun 12, 2012 at 3:52 PM, John Garbutt <John.Garbutt@xxxxxxxxxx>
>>> wrote:
>>> > Sure, I get your point.
>>> >
>>> > I think Florian is working on some docs to help on that.
>>> >
>>> > Not sure how much has been done already.
>>> >
>>> >
>>> >
>>> > Cheers,
>>> >
>>> > John
>>> >
>>> >
>>> >
>>> > From: Christian Parpart [mailto:trapni@xxxxxxxxx]
>>> > Sent: 12 June 2012 13:47
>>> > To: John Garbutt
>>> > Cc: openstack-operators@xxxxxxxxxxxxxxxxxxx
>>> > Subject: Re: [Openstack-operators] Nova Controller HA issues
>>> >
>>> >
>>> >
>>> > Hey, ya I also found this page, but didn't find it yet that helpful, it
>>> > rather much sounds like a theoretical paper on
>>> >
>>> > how they implemented it rather then telling me on how to actually make
>>> it
>>> > happen (from the sysop point of view :-)
>>> >
>>> >
>>> >
>>> > I hoped that someone had to face this already, since I really find it
>>> very
>>> > unintuitive to realize, or need to wait until
>>> >
>>> > I get more time to investigate dedicated. :-)
>>> >
>>> >
>>> >
>>> > Regards,
>>> >
>>> > Christian.
>>> >
>>> > On Tue, Jun 12, 2012 at 12:52 PM, John Garbutt <
>>> John.Garbutt@xxxxxxxxxx>
>>> > wrote:
>>> >
>>> > I thought Rabbit had a built in HA solution these days:
>>> >
>>> > http://www.rabbitmq.com/ha.html
>>> >
>>> >
>>> >
>>> > From: openstack-operators-bounces@xxxxxxxxxxxxxxxxxxx
>>> > [mailto:openstack-operators-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
>>> > Christian Parpart
>>> > Sent: 12 June 2012 09:59
>>> > To: openstack-operators@xxxxxxxxxxxxxxxxxxx
>>> > Subject: [Openstack-operators] Nova Controller HA issues
>>> >
>>> >
>>> >
>>> > Hi all,
>>> >
>>> >
>>> >
>>> > after spending the whole evening in making our cloud controller node
>>> highly
>>> > available
>>> >
>>> > using Corosync/Pacemaker, at which I am really proud about it, I am
>>> having
>>> > just a few
>>> >
>>> > problems left, and the one that freaks me out the most is
>>> rabbitmq-server.
>>> >
>>> >
>>> >
>>> > That beast I just seem to find no good documenation on how to set
>>> > rabbitmq-server up
>>> >
>>> > properly for HA'ing.
>>> >
>>> >
>>> >
>>> > Does anyone have ever tried to set a nova controller (including
>>> rabbitmq
>>> > dependency) up for HAing?
>>> >
>>> > If so, I'd be pleased to share experiences, especially to the latter
>>> part.
>>> > :-)
>>> >
>>> >
>>> >
>>> > Best regards,
>>> >
>>> > Christian Parpart
>>> >
>>> >
>>> >
>>> >
>>> > _______________________________________________
>>> > Openstack-operators mailing list
>>> > Openstack-operators@xxxxxxxxxxxxxxxxxxx
>>> >
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>>> >
>>>
>>>
>>>
>>> --
>>> Igor Laskovy
>>> Kiev, Ukraine
>>>
>>
>>