Yep, if you were just running two nova-api processes, you'd have two entry points. Hence the need for something like HAProxy (or Pound) to act as your single EC2 entry point but passing requests to your nova-api processes. Everything being stateless you wouldn't get into a state where the DB & messages were incorrect.
We haven't looked at replicating rabbitmq yet. If you come up with a solution, please share. Everett On Thu, Aug 18, 2011 at 3:21 PM, Joshua Harlow <harlo...@yahoo-inc.com>wrote: > The way suggested here would setup them as different ec2 entry points > though right? (the different port part). > > If you have one nova-api on one machine Y with X port and then another > nova-api on another machine Z with X port would that work. > > It would seem possible, just not sure if the code would handle that > correctly (is everything really stateless...) > > That way if Y machine dies, action will still occur on machine Z (just > whatever Y may be doing is dead – which may result in DB state & messages > being incorrect?). > > It seems like rabbitmq has active/passive failure, has anyone looked into > that? > > > On 8/18/11 12:27 PM, "Everett Toews" <everett.to...@cybera.ca> wrote: > > Yes and maybe (we're doing it). > > The individual nova-api processes need to run on their own port though. > > nova-api --flagfile=/etc/nova/nova.conf > --logfile=/var/log/nova/nova-api-<port1>.log --ec2_listen_port=<port1> > nova-api --flagfile=/etc/nova/nova.conf > --logfile=/var/log/nova/nova-api-<port2>.log --ec2_listen_port=<port2> > > you can fire up multiple nova-api processes with something like monit. Then > you can load balance between them with something like haproxy. > > Everett > > On Thu, Aug 18, 2011 at 11:43 AM, Joshua Harlow <harlo...@yahoo-inc.com> > wrote: > > Is it possible to have multiple nova-api’s, nova-networks running in the > same instance (connected to the same db/rabbitmq)? > > Say that you want to have fault tolerance, so you would have multiple > instances of these, so that if one failed the whole iaas system would not. > > Is that something typically done? > > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : openstack@lists.launchpad.net > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp > > > >
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