Как сделать динамические поддомены (multiple dynamic firewalls, роутинг и т.д.) в symfony2?

public function getRoles() {
    $roles = [];
    foreach ($this->getGroups() as $group) {
        $roles = array_merge($roles, $group->getRoleNames());
    }
    if (count($roles) < 1) {
        $roles[] = static::ROLE_DEFAULT;
    }
    return array_unique($roles);
}

security:
    firewalls:
        backend:
            ...
        dashboard:
            host: (.*).%main_host% # в %main_host% site.com
            pattern: ^/
            form_login:
                provider: dashboard_user_provider
                login_path: /login
                check_path: /login_check
                ...
            logout:
                path: /logout
                target: /login
            anonymous: true
            ...
    access_control:
        - { host: %backend_host%, path: ^/login$, role: IS_AUTHENTICATED_ANONYMOUSLY, requires_channel: https }
        - { host: %backend_host%, path: ^/, role: [ROLE_BACKEND_MODER], requires_channel: https }
        - { host: (.*).%main_host%, path: ^/login$, role: IS_AUTHENTICATED_ANONYMOUSLY, requires_channel: https }
        - { host: (.*).%main_host%, path: ^/, role: [ROLE_DASHBOARD_MANAGER], requires_channel: https }