Run python script on boot-up CentOS

Question

Trying to run a python script on boot-up of CentOS. My /etc/init.d/example-script looks like this:

case $1 in 
    start)
        $(python /etc/bin/example-script.py &)
    ;;
    stop)
        echo "filler text"
    ;;

When I try service example-script start, it runs the script, but does not execute in the background. example-script.py has a while(True) loop, so maybe this is why?

But when I type python /etc/bin/example-script.py & in Terminal, it does execute in the background. It's only when this command is inside a bash script that it fails.

This is probably more of a CentOS admin question than a Python programming question, so you should probably ask on whichever SE site is appropriate for that. (Also, I suspect you'll need to specify which version of CentOS.) — abarnert
– abarnert, Commented Mar 20, 2018 at 17:38

heemayl · Accepted Answer · 2018-03-20 17:39:31Z

1

That's because you have spawned a subshell by putting the command inside command substitution syntax ($()) i.e. command substitution runs the command in subshell; and you're backgrounding the command in that subshell, not the original script's shell.

Moreover, you are not doing anything with the STDOUT, so inviting another subshell seems pointless. Remove the command substitution:

python /etc/bin/example-script.py &

answered Mar 20, 2018 at 17:39

heemayl

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