0

I'm trying to setup a systemd unit that should restart a bash script if it fails.

[Unit]
Description=Bash script Service

[Service]
Type=simple
Restart=always
RestartSec=1
ExecStart=/bin/bash -c '/simple/bash/script.sh'

But from systemctl status the_bash_script.service it seems that it is started with multiple instances:

● the_bash_script.service - Bash script Service
   Loaded: loaded (/etc/systemd/system/the_bash_script.service; static; vendor preset: enabled)
   Active: active (running) since Thu 2016-11-03 18:16:53 CET; 3 years 6 months ago
 Main PID: 1766 (bash)
   CGroup: /system.slice/the_bash_script.service
           ├─1766 /bin/bash -c '/bin/bash -c '/simple/bash/script.sh'
           └─1778 /bin/bash -c '/bin/bash -c '/simple/bash/script.sh'

Why there are 2 pids 1766 and 1778? Can I allow only one instance at time?

If this is the content of the_bash_script.service I don't need thata multiple instance are run at the same time:

#!/bin/bash


while [ true ]; do
    cat /dev/virtual  | nc -v 192.168.1.1 5005    
    sleep 5s
done

exit
Improve this question
1
  • 2
    Please put in your question why you think that forking off another process is not a function of whatever your shell script does. Commented Jun 3, 2020 at 15:25

1 Answer 1

Reset to default
1

Your ExecStart=/bin/bash -c '/simple/bash/script.sh' contains /bin/bash -c which starts a bash shell with command /simple/bash/script.sh and then again when the script starts executing /simple/bash/script.sh it will start another bash shell i think.

Try this in your service file :

ExecStart=/simple/bash/script.sh

Also add the below lines and try:

ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
Improve this answer

You must log in to answer this question.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.