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James Sumners
Asked: 2015-12-18 13:40:03 +0800 CST

Force disabled server selection when using cookie based session persistence?

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Let's say I have an HTTP configuration block like so:

listen testing
  bind 1.2.3.4:80
  balance roundrobin
  use-server server1 if { urlp_val(force) eq 1 }
  use-server server2 if { urlp_val(force) eq 2 }
  force-persist if { urlp(offline) -m bool }
  cookie SRVID insert indirect nocache
  server server1 1.2.3.5:9000 cookie 1
  server server2 1.2.3.6:9000 cookie 2

Then, at some point, I disable server2 via the socket interface so that all connections to it are now forced over to server1. But server2 isn't really offline, it is just undergoing maintenance and it should be checked before being re-enabled. So requesting http://1.2.3.4/?force=2&offline=true should be proxied to server2. But that's not happening, it's being proxied to server1.

If I add option persist then persistence will stay and no one will be directed to server1 since server2 wasn't really unavailable.

How can I accomplish my goal of stopping automatically load balanced traffic from going to server2 but force conditional traffic to it when it is disabled?

haproxy

0 Answers