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This question has been asked quite a few times before but I didn't seem to get it working using the existing information.

My Pi runs Raspbian. I have a Python script named dnscheck.py which loops forever.

I need it to run at boot. I know I have to create a .sh file containing something like

sudo python dnscheck.py &

What I don't know is where this file should be or if it should contain anything else. I know about the init.d folder, but seeing the skeleton example I imagine there should be a simpler way to do this simple task.

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3 Answers 3

up vote 7 down vote accepted

If you want to control the process with commands like start, stop, restart etc using the skelton script and altering it for your purposes might be the best option.

If you just want the process to start and that's it, you might consider just putting the command, as you wrote it in your question, into the /etc/rc.local. (I don't have my RPi at hand, but I read online that there is an 'exit 0' line in there, you should put your command above this line)

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It worked! I must add that setting the permissions for the script and rc.local back to 755 (read/write/execute) is a must. Not sure if both need this setting, but it worked for me. Thanks a lot for the help! –  Vlad Schnakovszki Dec 27 '12 at 0:07
"as you wrote it in your question" Not quite -- you don't need sudo as rc.local runs root. You should also specify the complete path to the script, obviously. You should also add & at the end so that the script forks, e.g. /path/to/foobar.py &. –  goldilocks Feb 20 at 13:15

Move your script (we will save it to the file dnscheck) to /etc/init.d/, and set the permissions so it can be run:

chmod 755 /etc/init.d/dnscheck

Add LSB init tags to the top of your script. You will probably want to change Required-Start/Stop and the Description Tags to fit your script.

# Provides:          dnscheck
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start daemon at boot time
# Description:       Enable service provided by daemon.

Then create the symbolic links by running

update-rc.d /etc/init.d/dnscheck defaults
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To use a .py file, just put the line #!/usr/bin/python at the very start of your file. Then make it executable with chmod +x filename. Next, add the line: /path/to/file.py & to /etc/rc.local, with sudo privileges, swapping /path/to/file.py with the path to your script. This will execute at the end of boot.

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