How to do sticky load-balancing with HAProxy with Session transfer to new servers

Question

I am using appsession config element for sticky session. I have 5 weblogic instances 3 of them are active and serving load now when load increases i start additional 2 instances. Now HAProxy marks them "Helthy" but does not transfer any traffic to it because it sticky.

How do I transfer existing sessions to new weblogic servers. I am using Terracotta for session clustering so it does not matter which server is serving the request. Below is my config for HAProxy.

# this config needs haproxy-1.1.28 or haproxy-1.2.1

global
      log 127.0.0.1   local0
      maxconn 1024
      daemon
     # debug
      #quiet

defaults
      log     global
      mode    http
      option  httplog
      option  httpchk
      option  httpclose
      retries 3
      option redispatch
      contimeout      5000
      clitimeout      50000
      srvtimeout      50000
      stats uri /admin?stats
      stats refresh 5s

listen  terracotta 0.0.0.0:10001
#     balance url_param JSESSIONID
      balance roundrobin
      option httpchk OPTIONS /Townsend
      server  L1_1 10.211.55.1:7003  check
      server  L1_2 10.211.55.2:7004  check
   server  L1_3 10.211.55.3:7004  check
      appsession JSESSIONID len 52 timeout 3h

Answer 1

Then if it does not matter which server serves the request, disable stickiness and remove the appsession line. You must understand that stickiness is the opposite of load-balancing. If your issue is that you don't scale, don't stick first.