How to publish ports?

[banool]

How to publish ports?

[banool]

Alright here is how you do it:

const POSTGRES_DEFAULT_PORT: u16 = 5432;

fn myfunc(other_port: u16) {
    let port = other_port.to_string();
    let exposed_ports = Some(hashmap! {POSTGRES_DEFAULT_PORT => hashmap!{}});
    let host_config = Some(HostConfig {
        port_bindings: Some(hashmap! {
            POSTGRES_DEFAULT_PORT.to_string() => Some(vec![PortBinding {
                host_ip: Some("127.0.0.1".to_string()),
                host_port: Some(port),
            }]),
        }),
        ..Default::default()
    });

    let config = Config {
        image: Some(POSTGRES_IMAGE),
        exposed_ports,
        host_config,
        ..Default::default()
    };
}

In short, put the inner port in exposed ports and as the key in port bindings, use the outer port in the value of port bindings.

[dmartin]

You don't actually need the exposed_ports field to publish a port, only the port_bindings map within host_config.

exposed_ports is equivalent to the docker run --expose flag or Dockerfile EXPOSE statement - it doesn't actually do anything and is basically just a hint for clients regarding which ports should be published.

[banool]

Ah good to know, ty!