Comment or remove the default mysql settings in your fpm.ini

[sinaru]

First thank you very much for this and nginx cartridges
I wanted point out that the default blank values for mysql settings you have placed in fpm ini file was overriding openshift mysql environment vars. As a result I was getting

PDOException
SQLSTATE[HY000] [2002] No such file or directory

So I commented out the values and it was working again. 😅