Open Stack

This is the kind of flame war I love... ;-)

if you think the HA challenges in Openstack Nova are at MySQL and Rabbit
level, you are not putting the focus on the right components. The biggest
HA  (and scalability) challenges in Nova are in the networking side. There
are a lot of companies tackling the networking challenges of Nova
(BigSwitch, Nicira, Cisco, etc...), and I would like to see how they evolve
in the future and how they will address this problem. Right now, only
promises.

Fight!
-- 
Diego Parrilla
<http://www.stackops.com/>*CEO*
*www.stackops.com | * diego.parrilla at stackops.com** | +34 649 94 43 29 |
skype:diegoparrilla*
* <http://www.stackops.com/>
**



On Tue, Feb 21, 2012 at 1:04 PM, i3D.net - Tristan van Bokkem <
tristanvanbokkem at i3d.nl> wrote:

> **
> Hi Darren,
>
> No, I am not looking at a performance increasment at this moment. Just
> trying to make the different components Nova is build on redundant. Of
> course a master/master setup of mysql / rabbitmq with a floating IP will
> probably work but it bugs me that Nova is not really build with flexibility
> of it components in mind.
>
> I understand it is impossible to cover every scenario and you can make
> things redundant into the infinitive but why doesn't have Nova any of this
> build in? Why do I need to setup a Virtual IP/floating IP where Nova simple
> could accept multiple locations and failover if the first location fails.
> Or even round-robin to distribute the load. All I am doing now is yet add
> another component that can possibly fail as well.
>
>
> Best regards,
>
> Tristan van Bokkem
> Datacenter Operations
>
> Contact:
> E-mail Personal: tristanvanbokkem at i3d.net
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>
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> ------------------------------
> *From:* Darren Birkett [mailto:darren.birkett at gmail.com]
> *To:* i3D.net - Tristan van Bokkem [mailto:tristanvanbokkem at i3d.nl]
> *Cc:* Florian Haas [mailto:florian at hastexo.com],
> openstack at lists.launchpad.net
> *Sent:* Tue, 21 Feb 2012 12:51:11 +0100
>
> *Subject:* Re: [Openstack] Howto Nova setup with HA?
>
> Surely it depends what you want out of it? If just pure high
> availability (ie ability to continue functioning when primary node
> goes down), then doesn't a master/master with floating IP fit the
> bill?
>
> It sounds like what you're after is better performance/throughput
> rather than HA - the ability to write to multiple masters at the same
> time. Even here if nova *was* able to hit multiple databases, a
> master/master setup isn't going to suit, as each write to one master
> still needs to be replicated to the other so throughput is going to be
> the same. You'd then need to look to something like a native mysql
> cluster to get actual increased throughput.
>
> Darren
>
> On 21 February 2012 11:34, i3D.net - Tristan van Bokkem
>
> <tristanvanbokkem at i3d.nl> wrote:
> > Ho Florian,
> >
> > I respect your opinion of course and I am not here to start a fight.
> Point
> > is, how I understand it Nova really isn't very flexible on High
> Availability
> > terms. I have now a master/master mysql setup with a Virtual IP working
> just
> > to work around the shortcomings Nova imo introduces. This same story goes
> > for RabbitMQ, I need to setup RabbitMQ in HA (which is fine) but I need
> to
> > setup a Virtual IP for it as well just so Nova can correctly connect to
> it.
> > Without the VIP the hole point of setting it up in a cluster is useless
> as
> > you still will point nova to one single host.
> >
> > It shouldn't be that hard to make Nova listen to multiple mysql addresses
> > and rabbitmq hosts in a cluster?
> >
> >
> > Best regards,
> >
> > Tristan van Bokkem
> > Datacenter Operations
> >
> > Contact:
> > E-mail Personal: tristanvanbokkem at i3d.net
> > E-mail Support: info at i3d.net
> > E-mail NOC: noc at i3d.net
> > Website: http://www.i3d.net Office:
> > Interactive 3D B.V.
> > Meent 93b
> > 3011 JG Rotterdam
> > The Netherlands
> >
> > Visit www.smartdc.net – SmartDC is our in-house 36,000 sq. ft.
> datacenter in
> > Rotterdam, The Netherlands. High density hosting – multiple fiber
> carriers
> > in-house – Level3 PoP.
> >
> > Interactive 3D (i3D.net) is a company registered in The Netherlands at
> Meent
> > 93b, Rotterdam. Registration #: 14074337 - VAT # NL 8202.63.886.B01.
> > Interactive 3D (i3D.net) is CDSA certified on content protection and
> > security. We are ranked in the Deloitte Technology Fast 50 as one of the
> > fastest growing technology companies.
> >
> > ________________________________
> > From: Florian Haas [mailto:florian at hastexo.com]
> > To: openstack at lists.launchpad.net
> > Sent: Fri, 17 Feb 2012 13:32:51 +0100
> >
> > Subject: Re: [Openstack] Howto Nova setup with HA?
> >
> > On Thu, Feb 16, 2012 at 3:28 PM, i3D.net - Tristan van Bokkem
> > <tristanvanbokkem at i3d.nl> wrote:
> >> Hi Tom,
> >>
> >> Thank you very much for sharing your knowledge, this will help not only
> >> me!
> >> As I am still working on the MySQL part, you mentioned multi-master
> which
> >> I
> >> have running indeed, but I suppose there still will need to be some kind
> >> of
> >> entering point within the cluster. How did you managed this?
> >
> > Virtual cluster IP addresses and highly available MySQL (either DRBD
> > or MySQL replication based). Pacemaker is very well capable of
> > managing this.
> >
> > Of course, since you also quoted
> >
> http://openlife.cc/blogs/2011/july/ultimate-mysql-high-availability-solution
> > parts of which I wholeheartedly disagree with (as with all of Henrik's
> > Pacemaker bashing, but he's of course entitled to his own opinion),
> > then you might run away screaming from anything that barely mentions
> > Pacemaker in passing. But in reality[1], Pacemaker is an extremely
> > capable HA stack that would be well suited for this.
> >
> > Cheers,
> > Florian
> >
> > [1] To be polite, I should say "in my humble opinion," but my opinion
> > on this really isn't humble at all, so I prefer being honest over
> > being polite. :)
> >
> > --
> > Need help with High Availability?
> > http://www.hastexo.com/now
> >
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