How to use an existent network with testcontainers? - docker

Question

I have a test that will run with some controlled containers on an environment that already have an existent external docker network.
How can I make my test container connect to said network?
I tried the code bellow with no success:
public static final GenericContainer tcpController;
static {
Network network = Network.builder().id("existent-external-network").build();
tcpController = new GenericContainer("tcp_controller:0.0.1")
.withExposedPorts(3005)
.withEnv("TCP_PORT", "3005")
.withNetwork(network);
tcpController.start();
}
Essentially I want to do the equivalent of the following docker-compose
version: "3.4"
services:
machine:
image: tcp_controller:0.0.1
environment:
- TCP_PORT=3005
networks:
default:
external:
name: existent-external-network
EDIT 1:
What Vitaly suggested worked.
Here is what I actually did using his suggestions and the docs
Consider TcpHandler just a class that needed the IP and port
public static final DockerComposeContainer compose;
static {
compose = new DockerComposeContainer(
new File("src/test/java/docker-compose.yml")
)
.withExposedService("machine", 3005)
.withLocalCompose(true);
compose.start();
}
#BeforeAll
static void setup() throws IOException, TimeoutException {
settings = Settings.getInstance();
// We need to get the actual host and port using service name
settings.tcpURL = compose.getServiceHost("machine", 3005);
settings.tcpPort = compose.getServicePort("machine", 3005);
tcp = new TCPHandler(settings.tcpURL, settings.tcpPort);
tcp.start();
}

Answer 1

Fabio, not sure if you tried that - would using docker with local compose work for you? Like:
#Container
public static DockerComposeContainer docker = new DockerComposeContainer(
new File("src/test/resources/compose-mysql-test.yml")
)
.withLocalCompose(true);