Failure Symfony2 deployment to platform sh. SQLSTATE [HY000] [2002]
I had the same issue because twig was initialized and requested database to know which version of mysql was used. I solved this by adding the following under my doctrine configuration:
doctrine: dbal: [...] charset: UTF8 server_version: 5.6
[Doctrine\DBAL\Exception\ConnectionException] An exception occured in driver: SQLSTATE[HY000] [2002] Connection refused Clearly, your app can't connect to database. You can try to replace 127.0.0.1 with localhost but I doubt it will help.
Anyway something is wrong with host you are connecting to: database may be down or absent, IP may be invalid, firewall may block the connection etc.