I am in the midst of performance testing a web application and I get these errors in Apache logs
[Sat Apr 18 03:01:01 2015] [error] [client xx.xx.xxx.253] proxy: DNS lookup failure for: jboss-host-name returned by /some/url, referer: http://f5hostname/context/URI
It occurs only at high load levels. I have seen posts where this error occurs due to incorrect proxy configuration, but my case doesn't fall under that I guess. At the very end of the test I get another error - "All workers are in error state". I think the first DNS error causes all workers to shutdown.
Can someone point where I could start looking? Please let me know if you need more details than whats mentioned below.
More details:
Apache version: 2.2
mod_cluster: 1.2.4.Final
I have an F5 in front of two Apache servers. There are ten JBoss servers in the balancer.
Apache configuration snippet: (I am not using proxypass directive, just modcluster)
<IfModule mod_proxy.c>
ProxyRequests Off
ProxyVia On
</IfModule>
<IfModule mpm_worker_module>
ServerLimit, StartServers and worker related attributes configured here
</IfModule>
ProxyPreserveHost On
MemManagerFile /var/cache/httpd
<VirtualHost *:1280>
ManagerBalancerName some2 (this is the same usedin jboss using proxylist)
........Logs:
[Tue Apr 21 22:06:25 2015] [debug] mod_proxy_http.c(1973): proxy: HTTP: serving URL http://jbosshost:8080/uri
[Tue Apr 21 22:06:25 2015] [debug] proxy_util.c(2011): proxy: HTTP: has acquired connection for (jbosshost)
[Tue Apr 21 22:06:25 2015] [debug] proxy_util.c(2067): proxy: connecting http://jbosshost:8080/uri
[Tue Apr 21 22:06:25 2015] [error] [client 10.xxx.xxx.xxx] proxy: DNS lookup failure for: jbosshost returned by /URI
[Tue Apr 21 22:06:25 2015] [debug] proxy_util.c(2029): proxy: HTTP: has released connection for (jbosshost)
OS:
RHEL 6.5
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