Check and run/restart processes, bash

Question

I'm new in bash scripting, so after writing some code, I'm stuck :) Situation is this: I have few (three) java JARs which are running in the background after system boot. Need to have script which will periodically (10 sec) check if all this JARs are running, even if one of them is not running, it should restart the JAR. Here is my code, please correct it or give better one. This code is working, but there is a little problem: if one of JARs are not working and I running this script, it is starting to run it, but I don't know which one was started. Thus, need to have some universal script, which will understand which process is stopped and restart only it and inform in the screen. Thank you.

#!/bin/bash

vta_oar=`netstat -an | fgrep tcp | fgrep LISTEN | fgrep :8091`     #vta-oar 8091
vta_vas=`netstat -an | fgrep tcp | fgrep LISTEN | fgrep :8090`     #vta-vas 8090
vta_autokit=`netstat -an | fgrep tcp | fgrep LISTEN | fgrep :8093` #vta_autokit 8093

if [[ -z "$vta_oar" ]] && [[ -z "$vta_vas" ]]
        then
           echo "Starting Services VTA_OAR/VTA_VAS"
           java -jar /var/www/html/vta-oar.jar >> /var/log/vta-oar.log &
           java -jar /var/www/html/vta-vas.jar >> /var/log/vta-vas.log &
elif [[ -z "$vta_vas" ]] && [[ -z "$vta_autokit" ]]
        then
           echo "Starting Services VTA_VAS/VTA_AUTOKIT"
           java -jar /var/www/html/vta-vas.jar >> /var/log/vta-vas.log &
           java -jar /var/www/html/vta-autokit.jar >> /var/log/vta-autokit.log &
elif [[ -z "$vta_autokit" ]] && [[ -z "$vta_oar" ]]
        then
           echo "Starting Services VTA_AUTOKIT/VTA_VAS_OAR"
           java -jar /var/www/html/vta-autokit.jar >> /var/log/vta-autokit.log &
           java -jar /var/www/html/vta-oar.jar >> /var/log/vta-oar.log &
else
        echo "All services are running..."
fi

Check this!! https://stackoverflow.com/questions/11203483/run-a-java-application-as-a-service-on-linux hope it helps! — Alejandro Teixeira Muñoz, Oct 30 '17 at 20:26
THanks. But my question not about running java applications, but how to check if they already running, if not, restart them and restart only those which are stopped. — user37033, Oct 30 '17 at 20:34
You have answers there with this solution, for example: https://wrapper.tanukisoftware.com/doc/english/product-overview.html — Alejandro Teixeira Muñoz, Oct 30 '17 at 20:39
anyway, it´s not the same :) as you rightly said !! hope it helps anyway — Alejandro Teixeira Muñoz, Oct 30 '17 at 20:40
There's a metric cubic kilometer of duplicates, most mainly with poor answers. The good answers are almost invariably platform-specific. For platforms which have `pidof` that's probably what you want. — tripleee, Oct 31 '17 at 05:16
But how to make script to understand which process is stopped and restart only it? — user37033, Oct 31 '17 at 06:28

Check and run/restart processes, bash

0 Answers0