Python example: Marathon networking mode

networking-mode.py

def networking_mode(app_json):
    # Marathon 1.5+: there is a `networks` field
    networks = app_json.get('networks')
    if networks:
        # Modes cannot be mixed, so assigning the last mode is fine
        return networks[-1].get('mode', 'container')

    # Older Marathon: determine equivalent network mode
    container = app_json.get('container')
    if container is not None and 'docker' in container:
        docker_network = container['docker'].get('network')
        if docker_network == 'USER':
            return 'container'
        elif docker_network == 'BRIDGE':
            return 'container/bridge'

    # Otherwise, give up and default to host networking mode
    return 'host'