Symfony : how to set SSL parameters in Doctrine DBAL configuration (YAML)?

I found a much easier way than the rest. Make the following settings in app/config/config.yml:

# Doctrine Configuration
doctrine:
    dbal:
        driver:   pdo_mysql
        host:     "%database_host%"
        port:     "%database_port%"
        dbname:   "%database_name%"
        user:     "%database_user%"
        password: "%database_password%"
        charset:  UTF8
        # Options for SSL connection
        options:
            MYSQL_ATTR_SSL_CA : %ca_cert%
            MYSQL_ATTR_SSL_KEY : %private_key%
            MYSQL_ATTR_SSL_CERT : %public_cert%

Then in your app/config/parameters.yml file:

parameters:
    ...
    # SSL Info
    private_key: /etc/my.cnf.d/certs/client-key.pem
    public_cert: /etc/my.cnf.d/certs/client-cert.pem
    ca_cert: /etc/my.cnf.d/certs/ca-cert.pem

I tested this on Symfony3 and this works great. The paths above may be different, in particular the certs may be different depending on your distro and how you set it up.

With Symfony 3.2 and up this became a lot easier:

doctrine:
    dbal:
        <other configs>
        options:
            !php/const:PDO::MYSQL_ATTR_SSL_CA: %ca_cert%
            !php/const:PDO::MYSQL_ATTR_SSL_KEY: %private_key%
            !php/const:PDO::MYSQL_ATTR_SSL_CERT: %public_cert%

Symfony configuration via yaml (and possibly xml), doesn't allow the keys to be dynamically set, which means you can't use the constants. To get around this, you can create an extra PHP config file that just handles making a key out of the constants.

The solution in a Gist is here: https://gist.github.com/samsch/d5243de3924a8ad10df2

The two major features that this utilizes are that a PHP config file can use any string value for the key, including variables, constants; and that you can use parameters as values for other parameters (something I didn't know until I tried it recently.)

So, you add the PHP config file in config.yml:

imports:
    - { resource: parameters.yml }
    - { resource: pdo-constants.php }

pdo-constants.php is this:

<?php
$container->setParameter("pdo_options", [
    PDO::MYSQL_ATTR_SSL_CA => "%pdo_ca_file%",
]);

Add any other constants you need as well.

Then in parameters.yml, you just need the values for your constants:

parameters:
#...
    pdo_ca_file: /pathtocerts/certs/mysql-ca.pem

Now, I'm guessing that working with another DB system which uses PDO constants would be similar, but I've only used this MySQL.