ipvsadm - ActiveConn stalled?

Samo Gabrovec samo at root.si
Wed Apr 13 14:27:49 BST 2005

Kernel: 2.6.9-5.0.3.ELsmp (rh es4)
Ipvsadm: v1.24 2003/06/07 (compiled with popt and IPVS v1.2.0)
Keepalived: v1.1.11

rr works, since it just swings from side to side,wlc, lc dont. 
The setup is like this. 
2 servers of which one is director and realserver the other one is just
Let's name them s1/s2 and s2 has director on it. When i freshly start it
looks like this - which is cool. 
 -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  82.149.xx.xx:80 wlc
 ->                 Local   100    0          0
 ->                 Route   100    0          0
After 25 successful connects to httpd it looks like this.  s2 serverd 24
of them s1 - 1 [first one].
  ->                 Local   100    0          24
  ->                 Route   100    1          0

Then thing is that when first packet arrives  its routed to s1,
ActiveConn increases, but does not de-crease when the connection is
closed therefore next connection is handled by s2 since it has lower
ActiveConn. Every time i exceed ActiveConn of s1 on s2 one gets to s1.. 

If i shut down (http) service on s2 then all traffic is routed to s1 -
expected, but ActiveConn keeps rising. 

RR works since it doesnt care about how many which server has. 
Keepalived works ok also (changing weight when server is up/down)

On 2.4 i didn't have this problems. 
Any suggestions on what should i do/check/change ?  


Samo Gabrovec <samo at root.si>

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