Our PBX has 512MB of RAM and things are getting tight, so I’m looking to slim down the software.
So, I’ve got Nginx and PHP-FPM set up on Scientific Linux 6.7 and everything seems to be working just fine with a very minimal config; has anyone else tried it and had any issues? Anything I should pay extra attention to when testing?
This is my first time working with Nginx and I was pleasantly surprised how easy it was to get FreePBX up and running with it.
Care to share some instructions?
Sure, take a look here: http://mike.eire.ca/2016/07/08/running-freepbx-with-nginx/
Feel free to click some ads while you’re there 
No idea how well it will run under the outdated PHP 5.3 provided by the distro. I think PHP-FPM is much more mainstream now than it was 8 or 9 years ago; I use PHP 5.6. Definitely worth trying out though.
There are some known issues with FreePBX 13 and PHP 5.6 (eg, Dashboard). FreePBX 14 is going to have 5.5 (? I think? Have a look in the wiki) as a minimum requirement, and we’re using PHP 5.6 in Distro7.
5.6 as the min…
Interesting, I don’t have any problems with dashboard, or anything else, running PHP 5.6.
I haven’t looked at RHEL 7 too closely yet though; it’s a big change!
Yeah because, as typical, the version of PHP 5.6 in CentOS (whereever we get it from I can’t recall). Uses some code from PHP 7.
Namely: PHP: Error - Manual
Which has a class conflict with Dashboard.