Perhaps this will help:
http://wiki.lib.sun.ac.za/index.php/SUNScholar/Optimisations#Monit_monitor_service
On 5 November 2012 11:36, Vlastimil Krejcir <[email protected]> wrote:
> Hi,
>
> it's again and again - try to search dspace-tech archives, it has been
> already discussed. And don't be sad, this is probably not your fault and
> you're not alone who observer this behaviour. The solution is to have a
> "guard" testing periodically if Tomcat is running. In case Tomcat doesn't
> respond you need to restart it.
>
> Have a nice day
>
> Vlastik
>
>
> ----------------------------------------------------------------------------
> Vlastimil Krejčíř
> Library and Information Centre, Institute of Computer Science
> Masaryk University, Brno, Czech Republic
> Email: krejcir (at) ics (dot) muni (dot) cz
> Phone: +420 549 49 3872
> ICQ: 163963217
> Jabber: [email protected]
>
> ----------------------------------------------------------------------------
>
> On Sun, 4 Nov 2012, Francis Kayiwa wrote:
>
> > Hey all
> >
> > I am wondering if anyone can help shed light on this. We have
> >
> > Red Hat Enterprise Linux Server release 6.3
> > Apache 2.2.15 (Red Hat package)
> > Tomcat (Apache Tomcat Version 6.0.36)
> > Apache forwards request via AJP
> >
> > We seem to encounter frequent crashes that remain unpredictable to me
> > at the moment. As best as I can determine Tomcat is not processing
> > these `fast enough` based on the errors in the Apache logs
> >
> > We keep seeing these errors
> >
> > [Sun Nov 04 03:16:09 2012] [error] proxy: AJP: failed to make
> > connection to backend: localhost
> > [Sun Nov 04 03:16:16 2012] [error] (111)Connection refused: proxy:
> > AJP: attempt to connect to 127.0.0.1:8009 (localhost) failed
> > [Sun Nov 04 03:16:16 2012] [error] ap_proxy_connect_backend disabling
> > worker for (localhost)
> > [Sun Nov 04 03:16:16 2012] [error] proxy: AJP: failed to make
> > connection to backend: localhost
> >
> > Below are what I think are the pertinent parts of the config files
> > which I will gladly share on request.
> >
> > <IfModule prefork.c>
> > StartServers 8
> > MinSpareServers 5
> > MaxSpareServers 20
> > ServerLimit 256
> > MaxClients 256
> > MaxRequestsPerChild 4000
> > </IfModule>
> >
> > <VirtualHost *:80>
> > ServerName tld.domain.name
> > DocumentRoot /path/to/home
> > ErrorLog /var/log/httpd/error.log
> > CustomLog /var/log/httpd/access.log combined
> >
> > ProxyRequests Off
> >
> > ProxyPass /Shibboleth.sso !
> > ProxyPass / ajp://localhost:8009/ max=256 retry=60
> > ProxyPassReverse / ajp://localhost:8009/
> > </VirtualHost>
> >
> > <Connector port="8009" protocol="AJP/1.3" redirectPort="8443"
> > UIEncoding="UTF-8" tomcatAuthentication="false" enableLookups="false"
> > connectionTimeout="120000" packetSize="22528" maxThreads="256" />
> >
> > Is there anything there that looks unreasonable? Any recommendations?
> > My (mis?)reading of the dspace documentation is that mod_proxy_ajp has
> > the most reliable results. It certainly is that way on all our dev
> > machines.
> >
> > regards,
> > ./fxk
> >
> > --
> > "Beer busts, beer blasts, keggers, stein hoists, A.A. meetings, beer
> > nights..." --Homer Simpson
> >
> >
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> >
>
>
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