Here's an option: On 03.01.24 09:41, Chaudhary, Mohit wrote:
Hi,Please find below script code which has been written. STAT=`netstat -luptn | grep 8080 | awk '{print $6}'` if [[ "$STAT" != "LISTEN" ]]; then echo "Tomcat instance down" >> $MESSAGE mail -s "Tomcat Instance Down on $HOSTNAME" $mailto < $MESSAGE Thanks & Regards, Mohit Chaudhary
netstat -luptn contains the "p" option (which lists the PID/Program name). It also contains -u, which includes UDP ports. Both most likely not helpful in your case, and a sign that this script was quickly gobbled together and not well designed.
grep 8080 does not just match for a port, but will also trigger for any listed PID (or other output) containing those 4 characters. As you'll also see numeric IPV6 addresses (local or foreign ones) - and even local IPV6 addresses can change over time - there's another possibility for unintended matches.
So, assuming that there is some other output from netstat that somewhere contains "8080", but not "LISTEN" (or maybe if the output is multi-line), you'll get a false positive hit.
To validate that you're running into such an issue, you can add the grepped netstat output to the mail (before applying awk) - so either cache that output, or simply execute it again, piping it to $MESSAGE.
Olaf --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
