Forget the failover thing - Let's get back to your original problem which is stickysession not working. Have you checked you have the session cookie in the request and that it's called JSESSIONID? Check http://httpd.apache.org/docs/2.2/mod/mod_proxy.html#proxypass for details on how it is supposed to work. Rgds, Owen Boyle Disclaimer: Any disclaimer attached to this message may be ignored. ________________________________ From: Onur Agin [mailto:onuragin@xxxxxxxxx] Sent: Tuesday, November 24, 2009 1:23 PM To: users@xxxxxxxxxxxxxxxx Subject: Re: Load balancer sticky session problem What if I have a session clustering mechanism which works asynchronously, so if host A fails, then the sessions will be replicated to server B in several seconds, and if the session is sticky and request is moved to B, only request that will come on that second will fail. But if the load balancer is not sticky, it won't work since the sessions are not replicated realtime On Tue, Nov 24, 2009 at 2:16 PM, Boyle Owen <Owen.Boyle@xxxxxxxxxxxxx> wrote: > ? ? ? "The downside is that if the desired server is really down, the request > ? ? ? will eventually fail." > > ? ? ? I wouldn't want this, the reason why I am using a load balancer is to have high availability, > not just to balance a load. > > ? ? ? How can I overcome this? > ? ? ? Aren't there any alternatives? What do you imagine can happen? If you want sessions to be sticky then if a request has session ID that points to server-A, the request *must* go there. If server-A is unavailable, the request must wait. Alternatively, you can allow failover and then the request will go straight to server-B, but then it has the wrong session cookie. Session affinity and failover are mutually exclusive - there is no way round it. > ? ? ? Also what does it mean to be busy? > ? ? ? Currently I am using my pc to act as a load balancer in front of powerfull servers and there > is only one page request, how can it be busy? No idea. It's your server.. You posted that stickysession wasn't working and I posted back a possible explanation and something to try (did you?) Maybe it's not the problem - try it and see :-) Rgds, Owen Boyle Disclaimer: Any disclaimer attached to this message may be ignored. ? ? ? ?On Tue, Nov 24, 2009 at 12:27 PM, Boyle Owen <Owen.Boyle@xxxxxxxxxxxxx> wrote: ? ? ? ? ? ? ? ?Try adding "nofailover=On" to the Proxy tag, ie ? ? ? ? ? ? ? ?<Proxy balancer://ow1 stickysession=JSESSIONID lbmethod=byrequests ? ? ? ? ? ? ? ?nofailover=On> ? ? ? ? ? ? ? ?... ? ? ? ? ? ? ? ?By default, if the desired balancer member is busy, the request will be ? ? ? ? ? ? ? ?routed to another one, even if the stickysession doesn't match (this is ? ? ? ? ? ? ? ?"failover"). To force apache to hold the request until the server is ? ? ? ? ? ? ? ?free again, you need to switch this off by switching ON "nofailover" (so ? ? ? ? ? ? ? ?switching OFF "failover" - confusing, eh? :-) ? ? ? ? ? ? ? ?The downside is that if the desired server is really down, the request ? ? ? ? ? ? ? ?will eventually fail. ? ? ? ? ? ? ? ?Rgds, ? ? ? ? ? ? ? ?Owen Boyle ? ? ? ? ? ? ? ?Disclaimer: Any disclaimer attached to this message may be ignored. ? ? ? ? ? ? ? ?________________________________ ? ? ? ? ? ? ? ?? ? ? ?From: Onur Agin [mailto:onuragin@xxxxxxxxx] ? ? ? ? ? ? ? ?? ? ? ?Sent: Tuesday, November 24, 2009 11:05 AM ? ? ? ? ? ? ? ?? ? ? ?To: users@xxxxxxxxxxxxxxxx ? ? ? ? ? ? ? ?? ? ? ?Subject: Load balancer sticky session problem ? ? ? ? ? ? ? ?? ? ? ?Hi, ? ? ? ? ? ? ? ?? ? ? ?With the configuration below, sticky sessions won't work... ? ? ? ? ? ? ? ?? ? ? ?I checked that both servers get the request with the same ? ? ? ? ? ? ? ?session IDs. ? ? ? ? ? ? ? ?? ? ? ?Any ideas? ? ? ? ? ? ? ? ?? ? ? ?<VirtualHost *:8001> ? ? ? ? ? ? ? ?? ? ? ?# Proxy ? ? ? ? ? ? ? ?? ? ? ?ProxyRequests Off ? ? ? ? ? ? ? ?? ? ? ?<Proxy *> ? ? ? ? ? ? ? ?? ? ? ???Order deny,allow ? ? ? ? ? ? ? ?? ? ? ???Allow from all ? ? ? ? ? ? ? ?? ? ? ?</Proxy> ? ? ? ? ? ? ? ?? ? ? ?<Proxy balancer://ow1 stickysession=JSESSIONID ? ? ? ? ? ? ? ?lbmethod=byrequests> ? ? ? ? ? ? ? ?? ? ? ???BalancerMember http://10.xxx:7101 ? ? ? ? ? ? ? ?? ? ? ???BalancerMember http://10.xxx:7102 ? ? ? ? ? ? ? ?? ? ? ?</Proxy> ? ? ? ? ? ? ? ?? ? ? ?ProxyPass / balancer://ow1/ ? ? ? ? ? ? ? ?? ? ? ?</VirtualHost> ? ? ? ? ? ? ? ?? ? ? ?<VirtualHost *:8002> ? ? ? ? ? ? ? ?? ? ? ?# Proxy ? ? ? ? ? ? ? ?? ? ? ?ProxyRequests Off ? ? ? ? ? ? ? ?? ? ? ?<Proxy *> ? ? ? ? ? ? ? ?? ? ? ???Order deny,allow ? ? ? ? ? ? ? ?? ? ? ???Allow from all ? ? ? ? ? ? ? ?? ? ? ?</Proxy> ? ? ? ? ? ? ? ?? ? ? ?<Proxy balancer://ow2 stickysession=JSESSIONID ? ? ? ? ? ? ? ?lbmethod=byrequests> ? ? ? ? ? ? ? ?? ? ? ???BalancerMember http://10.xxx:7103 ? ? ? ? ? ? ? ?? ? ? ???BalancerMember http://10.xxx:7104 ? ? ? ? ? ? ? ?? ? ? ?</Proxy> ? ? ? ? ? ? ? ?? ? ? ?ProxyPass / balancer://ow2/ ? ? ? ? ? ? ? ?? ? ? ?</VirtualHost> ? ? ? ? ? ? ? ?? ? ? ?Also my request header is: ? ? ? ? ? ? ? ?? ? ? ?GET /xxx/resources/org.apache.wicket.markup.html.WicketEventReference/wicket ? ? ? ? ? ? ? ?-event.js;jsessionid=76BF17CE24DB39AC8F6B3639BBA5727D HTTP/1.1 ? ? ? ? ? ? ? ?? ? ? ?Accept: */* ? ? ? ? ? ? ? ?? ? ? ?Referer: http://10.xxx:8001/xxx/?class=texan.acq.ui.param.MERPARAM ? ? ? ? ? ? ? ?? ? ? ?Accept-Language: en-us ? ? ? ? ? ? ? ?? ? ? ?Accept-Encoding: gzip, deflate ? ? ? ? ? ? ? ?? ? ? ?User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; ? ? ? ? ? ? ? ?SV1; .NET CLR 2.0.50727; MS-RTC LM 8; InfoPath.2) ? ? ? ? ? ? ? ?? ? ? ?Host: 10.xxx:8001 ? ? ? ? ? ? ? ?? ? ? ?Connection: Keep-Alive ? ? ? ? ? ? ? ?? ? ? ?Cookie: JSESSIONID=76BF17CE24DB39AC8F6B3639BBA5727D ? ? ? ? ? ? ? ?This message is for the named person's use only. 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