composer install fails when unable to see mysql database
Doctrine introduced some code which tried to auto-detect things about the database quite eagerly.
A workaround is simply to tell Doctrine the target server version, e.g.
doctrine: dbal: default_connection: default connections: default: dbname: Symfony2 user: root password: null host: localhost driver: pdo_mysql server_version: 5.6See https://github.com/doctrine/DoctrineBundle/issues/351#issuecomment-75456547