Application Status script

Question

I have a start and stop script in-place and need a script that gives status on Linux server. My start script looks as below, can you please let me know if I can add some arguments/command to get my application status.

#!/bin/ksh

java_home=`cat /apps/abc.properties | grep "$1|" | cut "-d|" -f2`
service_executable=`cat /apps/abc.properties | grep "$1|" | cut "-d|" -f3`
service_home=`cat /apps/abc.properties | grep "$1|" | cut "-d|" -f4`
service_opts=`cat /apps/abc.properties | grep "$1|" | cut "-d|" -f5`

export JAVA_HOME=$java_home
export PATH=$JAVA_HOME/bin:$PATH
echo start $service_home
cd $service_home/bin
nohup $service_executable start $service_opts

abc.properties has below values

abc-3.7.3|/apps/java/jdk1.8.0_66|rmc|/apps/rmc/abc-3.7.3|-M-Drmc.mmc.bind.port=8770
abc-3.7.3-spii|/apps/java/jdk1.8.0_66|rmc|/apps/rmc/abc-3.7.3-spii|-M-Drmc.mmc.bind.port=8770

I want a scrpit that can check each version of application(JVM) using port numbers and give me status for example abc-3.7.3"running"/ abc-3.7.3-spii"down".

Answer 1

A quick version would be to have a script that would extract the application name and the port number form the input file (ex. read APP + stuff + PORT) and then check if the port is opened (ex. in the netstat output grep for the port number). This is a very short form that does just that:

while IFS="|=" read App _ _ _ _ Port; do
    netstat -lnt | grep -qw ":$Port" && echo "$App : running" || echo "$App : down"
done < abc.properties

Is it good enough?

Answer 2

Thanks for your answer, I tried using " if lsof -Pi :8080 -sTCP:LISTEN -t >/dev/null ; "and it worked fine on RHEL6 (4.82) but on RHEL5 I'm seeing a error below

lsof: unsupported TCP/TPI info selection: C lsof: unsupported TCP/TPI info selection: P lsof: unsupported TCP/TPI info selection: : lsof: unsupported TCP/TPI info selection: L lsof: unsupported TCP/TPI info selection: I lsof: unsupported TCP/TPI info selection: S lsof: unsupported TCP/TPI info selection: T lsof: unsupported TCP/TPI info selection: E lsof: unsupported TCP/TPI info selection: N lsof 4.78