Setting up SuPHP in WHM for security reasons

Running Suphp is recommended to run your websites as it is more secure.

SuPHP allows directory to remain owned by user:usergroup and tight 0750 permissions (or even 0700). Furthermore, files created through PHP (uploaded files as well) will be owned by the effective user instead of nobody as they otherwise would be. This allows users to manage/delete/rename these files themselves as a normal cPanel-level user as opposed to requiring root access, or needing a server admin to change the ownership for them.

Sound good? If so, let's get started!
Building SuPHP Support

Log into the WHM. Ensure you're running the latest build else if you are not you will be prompted to upgrade when running the next step.
Go to Main » Software » EasyApache (Apache Update).
Leave Previously Saved Config checked and select Start Customizing Based on Profile.
For security reason we recommend selecting the latest versions of Apache and PHP on the next three steps unless you have good reason to stick with an older version.
Step 5 will have a screen with quite a few options on it, the one we are concerned about is the second option SuPHP. Tick the checkbox here, scroll down, and click Save and Build.
:!: For additional security, we also recommend enabling Suhosin on this screen as well. More Info

Apache and PHP will now rebuild automatically for you, and you will not have any service downtime while this transpires. This build typically takes anywhere from 20-30 minutes to complete.
Enabling SuPHP as the Default Handler

In the WHM, go to Main » Service Configuration » Apache Configuration » PHP and SuExec Configuration, and for your specific version of PHP, select 'suphp' as the default handler from the dropdown list. Click Save New Configuration and you're done!

This setting is not retroactive for any files/directories with incorrect nobody ownerships, so you'll need to log into the server as root and fix those manually. Also while you're in there you can tighten down directory permissions as described above!
Converting to suPHP Tips and Tricks
Fixing Permissions on files and folders

When converting to suPHP one of the common problems admins see is customer websites showing “internal server errors”. Many times this is caused by incorrect permissions being set on the files and directories. The below code will help correct these permission problems by setting PHP files to 0600, directories to 0711, and files/directories to the proper user.group.

After converting to Suphp use this script to correct your permissions.

cd /var/cpanel/users/
/scripts/chownpublichtmls
for i in *;do find /home/$i/public_html -iname "*.php" -exec chmod -v 600 {} \;; find /home/$i/public_html/ -type d -exec chmod -v 0755 {} \;;done

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