Hi Yann, Yes, I tried that and didnt see any difference in the behaviour
Thanks, Yasser On Thu, Apr 23, 2015 at 4:24 PM, Yann Ylavic <ylavic....@gmail.com> wrote: > Hi Yasser, > > Coudn't it be that your DNS server/network is not following the load? > Can you still reproduce the failures with jbosshost in your /etc/hosts? > > Regards, > Yann. > > > On Thu, Apr 23, 2015 at 8:20 PM, Yasser <yarafa...@gmail.com> wrote: > > The test ran for two hours on 4/21/2015 between 8pm and 10:50pm. > > I got the SAR report generated using ksar tool and didnt find anything > wrong > > with the resource usage. Memory was almost full but not swapping either. > A > > lot of TCP connections which is expected at this load. CPU and IO looks > > normal. Please find attached ksar report. > > > > > > Thanks, > > Yasser > > > > On Wed, Apr 22, 2015 at 9:48 PM, Robert Webb <rw...@ropeguru.com> wrote: > >> > >> That is exactly what I was thinking. > >> > >> But on to your real problem.... > >> > >> What do the apache server's resources look like when this starts > >> happening? Things like number of connections, tcp port utilization, cpu, > >> I/O, etc... > >> > >> Makes me wonder if there isn't something being taxed and causing the > >> server's DNS lookups to time out. > >> > >> > >> > >> On Wed, 22 Apr 2015 21:44:18 -0400 > >> Yasser <yarafa...@gmail.com> wrote: > >>> > >>> Yes. The Apache servers may sound redundant with the current setup, > but > >>> in the future it will be used for other purposes like proxying to > >>> different > >>> virtual ips, php hosting etc. > >>> I cannot change the enterprise suite at this point in time. > >>> So are you running through the F5, load balancing to the two Apache > >>> proxies, then load balancing with the apache proxies to your 10 back > end > >>> JBOSS servers? > >>> > >>> > >>> On Wed, 22 Apr 2015 16:21:29 -0400 > >>> Yasser <yarafa...@gmail.com> wrote: > >>> > >>>> 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 OnMemManagerFile /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 > >>>> > >> > >> > > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org > > For additional commands, e-mail: users-h...@httpd.apache.org > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org > For additional commands, e-mail: users-h...@httpd.apache.org > >
