Can we let Docker choose a port?

I need to run tests in parallel.

Each test will spawn its own Kafka.

Each test will have a producer/consumer, connected to that Kafka.

Kafka therefore needs to expose a port, and it needs to be mapped to a host port. Problem is, since tests will run in parallel, I can't reuse the same port.

Docker allows you to generate a random host port by just running -p <internal>.

But the API forces me to specify the host port:

testcontainers-rs/testcontainers/src/clients/cli.rs

Lines 193 to 198 in 71bbdec

    
           if let Some(ports) = image.ports() { 
        
               for port in ports { 
        
                   command 
        
                       .arg("-p") 
        
                       .arg(format!("{}:{}", port.local, port.internal)); 
        
               }

This same problem had been discussed in #285 which leads me to believe that somewhere in the API I'm allowed to do that... otherwise, why was it removed...?

Thanks.

Actually random port is assigned by default, take a look at the example in modules: https://github.com/testcontainers/testcontainers-rs-modules-community/blob/15ec27c5a50f968f48da662d1e6c0cc2ac2657c0/src/kafka/mod.rs#L133-L141

You can get host port via .get_host_port_ipv4(..)

Closing due to inactivity, don't hesitate to re-open if it's still relevant.

Also take a look at recently merged changes #575

	if let Some(ports) = image.ports() {
	for port in ports {
	command
	.arg("-p")
	.arg(format!("{}:{}", port.local, port.internal));
	}