Apache Load Balancing issue using in clusterenvionment of tomcat.

Hi All,

i am doing clustering with load balance environment and got stuck with an
issue. can anyone please help me ... below is scenario.

i have two servers running tomcat 1 and 2 (running in cluster)and apache is
on server with tomcat 1.
here is load balancing entries.

<Proxy balancer://ajpcluster >
BalancerMember ajp://127.0.0.1:8009 route=tomcat1 loadfactor=100
BalancerMember ajp://192.168.0.5:8009 route=tomcat2 status=+H
</Proxy>
ProxyPass /vopium/ balancer://ajpcluster/vopium/
ProxyPassReverse /vopium/ balancer://ajpcluster/vopium/

when i make tomcat 1 down then all hits transfers to tomcat 2 with no delay
with same session state. but after that when i make tomcat1 up and tomcat 2
down then it shows me Service Temporarily Unavailable for at least 15 or
more seconds and in apache error logs i get following message

[error] ap_proxy_connect_backend disabling worker for (192.168.0.5)
[error] proxy: AJP: failed to make connection to backend: 192.168.0.5
[error] proxy: BALANCER: (balancer://ajpcluster). All workers are in error
state
[error] proxy: BALANCER: (balancer://ajpcluster). All workers are in error
state (EVEN tomcat 1 is up and running)

and after 15 or more seconds apache sends all hits to tomcat 1 and session
starts from same position with no screen crashing.

now if i use following entries

<Proxy balancer://ajpcluster >
BalancerMember ajp://192168.0.5:8009 route=tomcat2 loadfactor=100
BalancerMember ajp://127.0.0.1:8009 route=tomcat1 status=+H
</Proxy>

then i get reverse results. means if 2 is down then apache moves to tomcat 1
with no delay with same session state but after that if 2 gets up and 1 gets
down then it takes 15 or more seconds to switch to tomcat 2 with same
session state while showing Service Temporarily Unavailable for that time
period.


now if i use following enrtries

<Proxy balancer://ajpcluster >
BalancerMember ajp://127.0.0.1:8009 route=tomcat1 loadfactor=50
BalancerMember ajp://192.168.0.5:8009 route=tomcat2 loadfactor=50
</Proxy>


then it always take some time to switch to any other server. means if 1 gets
down with 2 is up then for some time Service Temporarily Unavailable and
then session starting from same position from tomcat2. and if 2 gets down
with 1 is up then again for some time Service Temporarily Unavailable page
and then session starting from same position from tomcat1.




i have tried different ways too but no success. i ll be very thankful to
anyone how can help me in this regard.

Thanks in anticipation
Kashif
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