On 01/07/2012 03:05 PM, Yuri Pankov wrote:
On Sat, Jan 07, 2012 at 02:21:51PM +0200, Kaya Saman wrote:
Hi,
I wrote a shell script to detect if the port of tomcat was in use or not
then restart if the port wasn't online; due to tomcat segfaulting as my
system hasn't got enough memory for it.
This is the shell script:
#!/usr/local/bin/bash
ntstat=`netstat -ap tcp | grep 8180 | sed -n '1p'`
sockstat would be more useful here.
So if I adapted to:
ntstat=`sockstat | grep java`
port="java"
(keeping the same variables in order to limit change - even though
minimal) then compared in my IF statement below that would have the same
result? I've never used sockstat although just peeked at the manual
quickly now:
http://www.freebsd.org/cgi/man.cgi?query=sockstat&sektion=1
port="8180"
#echo $ntstat
#echo $port
if [[ $ntstat =~ $port ]]; then
echo "Output of Netstat command $ntstat port number $port">
/root/java_restart/java_restart.log;
else
wait 60; /usr/local/etc/rc.d/tomcat6 restart;
Are you sure you want 'wait' here (or should it be 'sleep')?
It was sleep that I wanted - thanks! :-)
Sorry my shell scripting skills are really iffy at best.....
fi
Here in /var/log/cron - it can be seen that the script has been executed:
Jan 7 10:30:00 wiki /usr/sbin/cron[19509]: (root) CMD
(/root/java_restart/java_restart.sh)
Jan 7 11:00:00 wiki /usr/sbin/cron[20418]: (root) CMD
(/root/java_restart/java_restart.sh)
Jan 7 11:30:00 wiki /usr/sbin/cron[21356]: (root) CMD
(/root/java_restart/java_restart.sh)
Jan 7 12:00:00 wiki /usr/sbin/cron[22455]: (root) CMD
(/root/java_restart/java_restart.sh)
The strange thing is that if I run this script manually
/root/java_restart/java_restart.sh it works fine and does what it's
supposed to do. Cron however seems to execute the IF statement but not
get as far as else??? - it seems as tomcat doesn't restart.
Here is my little log file that tells the port is active:
-rw-r--r-- 1 root wheel 116 Jan 7 11:30 java_restart.log
If I stop tomcat just before the xx:00 or xx:30 time designations tomcat
will not be restarted by the script and I don't understand why?
This is the crontab: 0,30 * * * * /root/java_restart/java_restart.sh
Try changing it to /usr/local/bin/bash /root/java_restart/java_restart.sh.
Ok adapted the crontab let's see what happens now.
which is being run as root user.
Can anyone suggest anything that might be a possible cause for tomcat
not getting restarted automatically when the proper conditions are met?
Yuri
Thanks Yuri :-)
Regards,
Kaya
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