Example behat.yml

To access a context variable use $this->getParameter('ssh/ip');

# behat.yml
default:
  formatter:
    name: 'BaseFormatter'
  context:
    parameters:
      base_url: 'http://domain.local'

      ssh: 
        ip: '33.33.33.33'
        user: 'vagrant'
        key: ~

      mysql:
        ip: '127.0.0.1'
        database: 'database_name'
        port: 3306
        _name: 'root'
        password: 'root'

     custom:
       parameter1: 'yes'
       parameter2: 'no'