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I have installed lighttpd with fast-cgi on the raspberry pi. When running a python script that requires root priveleges, I get the following error:

RuntimeError: No access to /dev/mem. Try running as root! Traceback (most recent call last): File "/var/www/index.py", line 134, in GPIO.setup(17, GPIO.OUT);#enable A RuntimeError: No access to /dev/mem. Try running as root!

I have added www-data as a sudoer using visudo and "sudo usermod -a -G sudo www-data", but it did not work. How can I give lighttpd root priveleges? Security is NOT important as this is a personal project.

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lighttpd doesn't use sudo. Therefore adding www-data to the sudoers group doesn't help.

You need to change the Web user in your config file from www-data to root:

server.username = "root"

You can leave the group at www-data if needed, but if you want, you can change that to root as well.

What you could do instead, though, is using sudo as www-data from your Python script. Make sure you set NOPASSWD.

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