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Old 08-18-2011, 07:26 PM   #1
sethusubbiah
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Registered: Jul 2010
Posts: 36

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Issue with load balancer


Hi,

I am trying to balance load between two Apache http webservers. I created a load balancer using mod_proxy_balance from apache. When I run my client (which generates around 100s of threads every second and tries to browse through the website), after a few seconds i start getting 502 and 503 error response codes for few threads. There are few other threads that functions properly. I feel the loadbalancer might be overloaded but im not exactly sure. Can someone please let me know how to proceed in solving this issue. Thanks !

My proxy balancer setup :

<IfModule mod_proxy_balancer.c>

<Proxy balancer://hgcc13.org>
BalancerMember http://hgccvm90.org/ loadfactor=1
BalancerMember http://hgccvm92.org/ loadfactor=1
</Proxy>

<Location />
ProxyPass balancer://hgcc13.org/
</Location>

</IfModule>

- Sethu
 
Old 08-18-2011, 11:08 PM   #2
sethusubbiah
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Registered: Jul 2010
Posts: 36

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Rep: Reputation: 2
When I saw the error_log in the proxy , First I find

" connection time out to the backend servers" , then i see

" ap_proxy_connect_backend disabling worker" , and then

" All workers are in error state",

The above 3 messages are repeated for a short amount of time. Then I find only

"do_ypcall: clnt_call: RPC: Unable to send; errno = Operation not permitted ".

I ran the experiment only for 5 minutes.
 
  


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apache22, linux, loadbalancing, webserver


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