openstack team mailing list archive

["i3D.net - Tristan van Bokkem" <tristanvanbokkem@xxxxxx>]

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:
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E-mail Support: info@xxxxxxx
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  _____  

From: Darren Birkett [mailto:darren.birkett@xxxxxxxxx]
To: i3D.net - Tristan van Bokkem [mailto:tristanvanbokkem@xxxxxx]
Cc: Florian Haas [mailto:florian@xxxxxxxxxxx], openstack@xxxxxxxxxxxxxxxxxxx
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@xxxxxx> 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@xxxxxxx
  > E-mail Support: info@xxxxxxx
  > E-mail NOC: noc@xxxxxxx
  > 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@xxxxxxxxxxx]
  > To: openstack@xxxxxxxxxxxxxxxxxxx
  > 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@xxxxxx> 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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