CODEWITHSUNDEEP
linuxbashshell
Dylan_
Dylan_

Reputation: 53

Bash: Continuously check processes running or not with some parameters

I want to create script that will check continuously process status running or not. If process will not run, script should catch it and restart it in a seconds. How can I run continuously this script on the system and how should I change the script via ---> Important points: it should take as parameters these: 1-seconds to wait between attempts to restart service, 2- number of attempts and 3- generate logs of events. Nginx is a example for the process. It can be replaceable.

#!/bin/bash 
SERVICE="nginx" 
if pgrep -x "$SERVICE" >/dev/null 
then 
    echo "$SERVICE is running" 
else 
    echo "$SERVICE stopped" 
    # start nginx if stopped 
    echo "$SERVICE starting" 
    systemctl start $SERVICE
fi

Upvotes: 0

Views: 712

Answers (1)

Fravadona
Fravadona

Reputation: 16950

You can try something like this:

#!/bin/bash

service="nginx"
seconds=2
retries=3

until (( retries-- == 0 ))
do
    property=$(systemctl show --property MainPID "$service")

    if [[ $property == MainPID=0 ]]
    then
        echo "$service stopped"
        echo "$service starting"
        systemctl start "$service" >& /dev/null
    else
        echo "$service is running"
        exit
    fi

    sleep "$seconds"
done

echo "$service is broken"

Upvotes: 3

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