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.
Sent: Tuesday, November 24, 2009 1:23 PM
Rgds,
Owen Boyle
Disclaimer: Any disclaimer attached to this message may be ignored.
________________________________
From: Onur Agin [mailto:onuragin@xxxxxxxxx]
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: [users@httpd] 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
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information. If
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? ? ? ? ? ? ? ?The sender's company reserves the right
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