php56+mod_ruid2 -> php71+php_fpm: Broken images Wordpress / MySQL-error phpbb forums

Current setup:
- php1 : php56 w/mod_ruid2
- php2 : None

CentOS 6. Everything updated (yum/CB)

Tried to change to php56+php_fpm last night, from running php56+mod_php w/ mod_ruid2, and running the 2nd php-release with php71+php-fpm.
- php1 : php56+php-fpm
- php2 : php71+php-fpm
- turned off mod-ruid2 in CB

As a result, phpBB-forums got broken with a mysql-error (mysql-connect function does not exist).
And Wordpress-sites lost all of their selfhosted images.

I used: "./build php n" and rewrite configs.
Also, as a result, CSF/lfd started send out warnings of exceeded memory resources.

For the mysql-errors, should MySQL also have been Build?

Tried rebuilding php back just v71 and mod_php+mod_ruid2, but still got similar issues, so I reverted back again to the single php-setup with php56+mod_ruid2.

The affected/tested Wordpress sites/plugins and phpBB-forums were all up to date.
Will now dive into the logs to see if I can spot any errors.

Any tips/ideas?