Background vbash scripts

General questions
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1

Is it possible, to run background nested vbash scripts in VyOS ?

2

Would scheduled tasks meet your needs?

3

Not in this case. Basically, I need to start a few jobs in background, however as soon I’m using set/commit commands inside it, the scripts are killed and get frozen in zombie state, until killed manually with kill -9. But not sure why is this yet.

4

I managed to get this working on VyOS VyOS 1.4-rolling-202308180646:

Create file /config/custom/testsleep.sh (chmod 775 + chown root:vyattacfg) containing:

#!/bin/sh

# Script debugging
#set -x

# Set variables
LOGFILE=/config/custom/testsleep.log

# Perform stuff
while true; do
        NOW=$(date +"%y%m%d_%H%M%S")
        echo ${NOW} >> ${LOGFILE}
        sleep 2s
done

Then in /config/scripts/vyos-postconfig-bootup.script add this:

/config/custom/testsleep.sh &

And then reboot.

After reboot you can verify that its running in the background:

root@vyos:~# ps auxwww | grep -i testsleep
root        2761  0.0  0.0   6936  3444 ?        S    14:09   0:00 /bin/sh /config/custom/testsleep.sh

but also check the log it spits out to its logfile:

root@vyos:~# tail -f /config/custom/testsleep.log 
230822_141456
230822_141458
230822_141500

The proper way would of course (since this is a systemd based system) to utilize systemd.service because this way the script can have a watchdog through systemd to get restarted if it crashes and such. Or by adding it as a “cronjob” to be triggered once an hour or such.

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