View source for Use systemctl from web script on Raspbian

On Raspbian jessie, authority to the systemctl command is managed by polkit. To allow a web script to poweroff or reboot your pi using the systemctl command, you'll need to make some configuration changes to polkit-1.

Create or modify <code>/etc/polkit-1/localauthority.conf.d/60-desktop-policy.conf</code> to have the following content:
 [Configuration]
 AdminIdentities=unix-user:pi;unix-user:www-data;unix-user:0

Create <code>/etc/polkit-1/localauthority/50-local.d/www-data.pkla</code> to have the following content:
 [www-data Permissions]                                                                                                                   
 Identity=unix-user:www-data                                                                                                              
 Action=org.freedesktop.login1.*                                                                                                          
 ResultAny=yes                                                                                                                            
 ResultInactive=yes                                                                                                                       
 ResultActive=yes
You may name this file as you like, but it must have a .pkla extension.

Configuration changes to polkit are applied in real time, so all you need to do now is run your web script from a browser:
 <?php
 // reboot.php - script to reboot the system
 `systemctl reboot -i`;
 ?>
Here the backtick operator is used to execute a shell command, and option -i is used to ignore inhibitors. Make sure you secure access to your script as required.

Reference: https://www.freedesktop.org/software/polkit/docs/0.105/pklocalauthority.8.html

[[Category:Raspberry Pi]]