I have two Varnish servers behind a F5 BIG-IP load balancer. Both servers are constantly active and serving ~5,000 requests/second 24x7. Clients aggressively use HTTP 1.1 Keep-Alives.
I'm looking to develop a process for servicing and upgrading the Varnish servers which results in 0 downtime to the client. Our normal process for performing changes on production servers is: 1. Mark the server as disabled in the BIG-IP 2. Wait for the connections on the server to drop to 0 3. Service the machine However, because of the aggressive and constant use of HTTP Keep-Alives, clients virtually never drop their connections, and the machine continues to serve traffic for quite a long time after it is disabled in the BIG-IP. Is there a way to tell Varnish to aggressively close all client HTTP connections? Thank you, Steve -- Steven Engelhardt [email protected]
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