Forum Discussion
Kranthi
Nimbostratus
NimbostratusVIP Failover and Failback Process with back end servers
Hi Team,
We got a typical requirement from client as below.
F5 Load Balancer VIP with 4 backend servers total, two servers with priority group 10 and 2 servers with priority group 5
the scenario is, if all backend servers fails on priority group 10 then failover to backend servers with priority group 5, which is already in place and is working as expected.
the requirement now from client is, if the high priority group backend servers come online traffic shouldn't failback to higher priority group servers, VIP requests needs to be forwarded only to Priority group 5 only, it has to switch back higher priority group servers again only if all backend servers failed in lower priority group 5.
Now challenge for us is as soon as high priority group backend servers come online traffic is switching to them directly which we don't want.
Hope i explained correctly. Please provide your expert knowledge and provide me a suggestions on this design
MitheorCirrus
Hi Kranthi,
i don´t think there is a way to achieve this via GUI.
One thing you could try is use "manual resume" for the priority group and a iRule to enable it again when needed.
So, in the end, it would work like this:
Priority group 10 --> "A"
Priority group 5 --> "B"
A is UP and B is standby.
A fails (and gets disabled).
B takes control of the traffic.
When B fails a iRules enables A again.
Does it makes sense?
Hope it helps.
Br
KranthiHI Mitheor,
Thanks for your update. but how we can perform auto disable and what will be the irule in such cases.
- Mitheor
Hi,
regarding manual resume:
https://support.f5.com/csp/article/K83316932
However, i´ve taking a look and it seems it´s not possible to change a node status via iRule.
You could probably achieve this via iCall but it´s not an easy task i´m afraid.
If a have more time these days i´ll try to think about it.
Sorry mate.
Br