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From: "Turner, John" <JTurner@AAS.com>
To: 'Tomcat Users List' <tomcat-user@jakarta.apache.org>
Subject: RE: crontab problems
Date: Tue, 25 Feb 2003 09:29:15 -0500
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Yes, Tomcat is generally very stable.  But: Trust, but verify. ;)

John

> -----Original Message-----
> From: Hannes Schmidt [mailto:mail@schmidt-net.via.t-online.de]
> Sent: Tuesday, February 25, 2003 9:23 AM
> To: Tomcat Users List
> Subject: Re: crontab problems
> 
> 
> Yes, using wget is probably the second best solution. The 
> best one is to
> find the reason why Tomcat crashes at all, since it generally 
> is a stable
> and reliable product.
> 
> Cron doesn't execute more than once a minute (at least mine 
> doesn't) which
> still is quite often. 5 or 10 minutes would be ok too. But 
> that's a matter
> of taste, really.
> 
> ----- Original Message -----
> From: "Turner, John" <JTurner@AAS.com>
> To: "'Tomcat Users List'" <tomcat-user@jakarta.apache.org>
> Sent: Tuesday, February 25, 2003 3:00 PM
> Subject: RE: crontab problems
> 
> 
> >
> > Agreed...using a Java program to watch Tomcat seems a 
> little circular.
> > Plus, I don't see any sort of delay or "sleep" in the poster's JAva
> > code...it looks like it just keeps hammering at Tomcat, as 
> the cron job is
> > "* * * * *".  Creating all those Runtime objects over and 
> over can't be
> > helping performance any.
> >
> > A simple shell script using wget would be fine...sure, you 
> can watch the
> > output of "ps -ef", but that doesn't tell you if Tomcat is accepting
> > requests or not.  There could be an entry for Tomcat in the 
> process table,
> > but Tomcat could be refusing requests.
> >
> > I just write a simple JSP page that outputs the contents of 
> a variable,
> like
> > "***SUCCESS***" or something like that, then use wget to 
> grab that page
> > every so often and check for the string in the output...if 
> it's there,
> > things should be OK (there are no guarantees).  If it's 
> not, you have a
> > problem.  This way, the JSP page is compiled and cached by 
> Tomcat, it uses
> > very little memory, and doesn't bog down the server.
> >
> > There are plenty of other alternatives much more robust 
> than a simple
> shell
> > script...you could use Netsaint/Nagios, Big Brother, and a 
> whole bunch of
> > others.
> >
> > John
> >
> > > -----Original Message-----
> > > From: Hannes Schmidt [mailto:mail@schmidt-net.via.t-online.de]
> > > Sent: Tuesday, February 25, 2003 6:29 AM
> > > To: Tomcat Users List
> > > Subject: Re: crontab problems
> > >
> > >
> > > Right, you might also just put
> > >
> > > JAVA_HOME=...
> > >
> > > at the beginning of your crontab.
> > >
> > > I assume you have good reasons to use a Java program to 
> watch Tomcat.
> > > Personally, I would have written a shell script. If you
> > > really want to use
> > > Java, you might want to use a different, more reliable
> > > approach to detect
> > > (un)availability of Tomcat, something like
> > >
> > > import java.net.*;
> > > URL url = new URL( "http://localhost:8080/examples" );
> > > URLConnection con = url.openConnection();
> > > con.setUseCaches( false );
> > > con.connect();
> > > if( con.getContentLength() > 0 ) {
> > >     // restart tomcat
> > > }
> > >
> > > But I just wrote this out of my head ...
> > >
> > > ----- Original Message -----
> > > From: "Ralph Einfeldt" <ralph.einfeldt@uptime-isc.de>
> > > To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
> > > Sent: Tuesday, February 25, 2003 10:43 AM
> > > Subject: RE: crontab problems
> > >
> > >
> > > You have to make shure that your script retstart_tomcat
> > > sets and exports all needed environment variables before
> > > calling ./startup.sh:
> > >
> > > JAVA_HOME=/usr/local/java/jdk1.3.1
> > > CATALINA_HOME=<path to tomcat installation>
> > > CATALINA_BASE=<path to tomcat instance> or $CATALINA_HOME
> > > # JAVA_OPTS='-client -v'
> > >
> > > export JAVA_HOME CATALINA_HOME CATALINA_BASE JAVA_OPTS
> > > ./startup.sh
> > >
> > > > -----Original Message-----
> > > > From: Ayhan Peker [mailto:ayhan@image-data.com]
> > > > Sent: Tuesday, February 25, 2003 10:30 AM
> > > > To: tomcat-user@jakarta.apache.org
> > > > Subject: crontab problems
> > > >
> > > > but the last two lines returns
> > > > /////////////////////////
> > > > The JAVA_HOME environment variable is not defined
> > > > message..
> > > > /////////////////////////
> > > > my retstart_tomcat scrip is
> > > > #!/bin/sh
> > > > cd /usr/local/tomcat/bin
> > > > ./startup.sh
> > >
> > > 
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