VIP Responds when RS Down

0

Hello,

I was setting up a service with two real servers attached. When I test the service by disabling the real servers, the VIP still responds to ICMP. If I deactivate the service it stops responding. How do I force the service down when the real servers are disabled or down?

3 comments

Avatar
0
Bill DeCastro

Hi James,

What you're describing is expected behavior. For the VIP to stop responding to ICMP Ping requests, the VS does need to be deactivated.

In order to stop serving requests through the VS, I'd recommend navigating to System Configuration > Miscellaneous Options > L7 Configuration > Check Drop at Drain Time End and set L7 Connection Drain Time to 0 (zero). This will force a real server to drop all existing connections when disabled and the server will no longer accept new connections.

Note, if this shouldn't happen immediately, modify the L7 Connection Drain Time. For example, if you'd like all connections to be dropped after the server has been disabled for one minute, set this field to 60.

Avatar
0
James McKane

Bill, thank you for the quick response.

What's the recommendation for monitoring the service with a network management system? If ICMP continues to work then that will result in a false positive. I assume that it would monitoring would have to move the real servers?

Regards

James

Avatar
0
Bill DeCastro

Not a problem, James.

In order to determine if the real servers are unreachable, the client device would need to request application-level traffic. If ICMP Ping or TCP connections are relied on, then the VIP will simply respond as the target device.

If you have further questions, please submit a request to nasupport@kemptechnologies.com and we will be happy to continue working with you.