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Error establishing a database connection

This either means that the username and password information in your wp-config.php file is incorrect or that contact with the database server at localhost could not be established.

WordPress database error: [Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)]
SELECT option_value FROM wp_options WHERE option_name = 'siteurl' LIMIT 1

Error Code: 2002
SQLSTATE[HY000] [2002] No such file or directory

Are you sure you have the correct username and password?
Are you sure the database server is running?
Are you sure the database server is at localhost?

If you are unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.