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Failover Pair: Backup Agent does not acquire Virtual IP

Solved1.79K views18th July 2023Failover virtualip
2
Rodrigo Salvador [SLC]50 12th August 2021 0 Comments

Hi All,

We have an end-user setting up a Failover configuration, however their Backup agent does not seem to acquire the Virtual IP automatically after a failover switch.

Note that it can still be reached via it's individual IP (and functions correctly, going into standby mode when the main agent is offline) when it's online. The main agent can be reached via both it's interfaces when it's online as it does acquire the virtual IP properly.

Any tips on how to set up the Virtual IP acquisition properly?

Cheers,

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 18th July 2023

4 Answers

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Alberto De Luca [DevOps Enabler]4.58K Posted 13th August 2021 2 Comments

Do you get the same behaviour (failover DMA taking over without getting the VIP) even if you force online the offline agent? Are all the addresses in the same /24 subnet?

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 18th July 2023
Rodrigo Salvador [SLC] commented 18th August 2021

Hi Alberto, this question is the one that has stood out so far, as everything else looks as it should. Is it necessary to use a /24 subnet? The user in this case has a /28 subnet. And yes, if we force the Backup agent online, the failover executes, (and the main agent goes dormant) but the Backup agent never grabs the virtual IP.

Alberto De Luca commented 11th October 2021

Hi Rodrigo,
I’ve seen this only now – I assume you got the answers now.
/24 or higher (/28 in your case) wold be normally ok, as long as we have room for 3 IPs on it.

I had asked just to exclude that the deployment had e.g. a /16 (that is currently not possible – I remember discussing this in the past when exploring having a main and a backp agent across 2 different data-centres, where the the network architecture would not allow to extend the same /24 subnet across 2 different sites).

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