[php] SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: YES) symfony2

This is due to your mysql configuration. According to this error you are trying to connect with the user 'root' to the database host 'localhost' on a database namend 'sgce' without being granted access rights.

Presuming you did not configure your mysql instance. Log in as root user and to the folloing:

CREATE DATABASE sgce;

CREATE USER 'root'@'localhost' IDENTIFIED BY 'mikem';
GRANT ALL PRIVILEGES ON sgce. * TO 'root'@'localhost';
FLUSH PRIVILEGES;

Also add your database_port in the parameters.yml. By default mysql listens on 3306:

database_port: 3306

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