[Fiware-lab-federation-nodes] HA Proxy and VIP

Giuseppe Cossu giuseppe.cossu at create-net.org
Tue Jan 19 11:16:10 CET 2016


Hello all, Sean,
Sorry I didn't understand the question, but at the end I got it.

In the OpenStack environment deployed by FUEL 7, there is the HA proxy that
does a bind to a VIP (it is not a floating IP). VIP is an additional
(public in that case) IP managed by the Corosync/Pacemaker as a resource of
the cluster. So basically each controller has a fixed public IP and the HA
proxy sends the incoming requests to one the controllers. That is valid for
all the endpoints of OpenStack (nova, neutron, etc.). Look at the image as
example. So the endpoints are like this: http://<VIP_addrees>:<PORT>

So if a controller goes down the endpoint is the same. The HAproxy sends
the requests to the up & running controllers. As mentioned the VIP is
managed by Corosync/Pacemaker. In order to see all the resources of the
FUEL deployed environment, use that useful command "crm status". In this
way you can see all the cluster resources, including the public VIP
resource called "vip__public". There is also a private vip called
"vip__management".


Best Regards,
Giuseppe

-- 
--------------------------------------------------------
Giuseppe Cossu
CREATE-NET
Smart Infrastructures
Research Engineer
Via alla Cascata 56/D - 38123 Povo Trento (Italy)
e-mail: giuseppe.cossu at create-net.org
Tel: (+39) 0461312428
www.create-net.org
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