Having problems running shell script from crontab
kayasaman at gmail.com
Sat Jan 7 12:50:47 UTC 2012
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:
ntstat=`netstat -ap tcp | grep 8180 | sed -n '1p'`
if [[ $ntstat =~ $port ]]; then
echo "Output of Netstat command $ntstat port number $port" >
wait 60; /usr/local/etc/rc.d/tomcat6 restart;
Here in /var/log/cron - it can be seen that the script has been executed:
Jan 7 10:30:00 wiki /usr/sbin/cron: (root) CMD
Jan 7 11:00:00 wiki /usr/sbin/cron: (root) CMD
Jan 7 11:30:00 wiki /usr/sbin/cron: (root) CMD
Jan 7 12:00:00 wiki /usr/sbin/cron: (root) CMD
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
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?
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