Question
What's the difference between mod_ruid2 and mod_suexec, and which one should I use?
Answer
The Difference
The module mod_suexec allows Apache to streamline requests to be processed on a user-level basis. This workflow is vital from a security standpoint as it prevents Apache from directly executing scripts, which would potentially cause damage if a malicious script made its way to the server, granting that script access to other user site data (if the script was executed as Apache).
The module mod_ruid2 also allows Apache to exhibit the same advantages as mod_suexec. It also aims to improve overall performance by using POSIX.1e's capabilities.
Which one should I use?
A fresh cPanel install comes shipped with mod_ruid2 enabled within the default profile. Usage primarily depends on server necessity, based on how many resources you are willing to dedicate to Apache, and compatibility with other modules. Common incompatibilities with mod_ruid2 would include ModSecurity. You can learn more about this by reading:
How to fix Failed to access DBM file
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