[Openstack-operators] Openstack HA active/passive vs. active/active

Alvise Dorigo alvise.dorigo at pd.infn.it
Wed Nov 27 18:05:01 UTC 2013


On 26 Nov 2013, at 14:05, Robert van Leeuwen <Robert.vanLeeuwen at spilgames.com> wrote:

> > Hello,
> > I've read the documentation about Openstack HA (http://docs.openstack.org/high-availability-guide/content/index.html) and I successfully implemented the active/passive model (with corosync/pacemaker) for the two services Keystone and Glance (MySQL HA is based on
> > Percona-XtraDB multi-master).
> > I'd like to know from the experts, which one is the best (and possibly why) model for HA, between active/passive and active/active, basing on their usage experience (that is for sure longer than mine).
> 
> Hi,
> 
> No so much about active/passive and active/active but maybe helpful:
> My personal opinion is that I would try to avoid cluster software as much as possible.

Hi Robert,
do you mean try to NOT use pacemaker/corosync ?
they say it’s about the best cluster software around… but I understand your point which suggests more simplicity…

thanks,

	A.

> They are highly complex pieces of software and you run the chance of creating more issues then you are solving.
> 
> However, some piece will need to be highly available in your setup.
> I would limit those to as few (and simple) technologies as possible.
> In our company we already had HA load-balancers (a propriety solution) in house so we decided to use those to also make Openstack HA.
> 
> The only real pain point we have left is the neutron l3 router. 
> A possible solution would be to use our hardware routers for this (we use VLANs so this is pretty easy to setup/integrate).
> We will probably go that way in the future.
> (Currently we have no strict HA requirement for the router yet since all our production traffic to the cloud is going straight from/to the load balancers to the virtual machines without the l3-router in between)
> 
> Cheers,
> Robert van Leeuwen
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