Re: auto restarting in crontab

[Christoph Brinkhaus <c.brinkhaus@t-online.de>]

Am Thu, Mar 16, 2023 at 08:55:54AM +0800 schrieb coreyh@free.fr:
> Greetings,
> 
> My script for monitoring Node.js app as follows. I put it in crontab for
> auto-check and restart if failure.
> 
> #!/bin/bash
> 
> # scan the port
> nc -z 127.0.0.1 3000
> 
> if [ $? -eq 0 ];then
>   exit
> else
>   killall node
>   sleep 1
>   nohup serve -s  /home/myUsername/workspace/xxx-frontend/build &
> fi
> 
> 
> I can run the script by manual, but in crontab it won't work. that means,
> when node.js dies, it will not get restarted by this script automatically.
> 
The environments of login shells and crontab can be different. This
includes the path where to seek executables. Therefore it is good
practice not to write just the name of the executable as nc but the
name with the path as /usr/bin/nc. Here I took nc as an example.

Kind regards,
Christoph
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