container.attach stuck when using stdin

[carl-sauter]

Hey there, I am trying to connect to a running container using attach. However when I use stdin: true it hangs in this line.

This is my code:

const Docker = require("dockerode");

const docker = new Docker({socketPath: '/var/run/docker.sock'});

const container = docker.getContainer('56cd62bc09ba8e46730f681bfd4cd08b741a6b98db9d676fb6af06c90ceb24b9')
const stream = await container.attach({
    stdin: true,
    stdout: true,
    stderr: true,
    stream: true,
})

stream.pipe(process.stdout)

setInterval(() => {
    stream.write("velocity info\n")
}, 3000)

I started the container using the following command

docker run -itd --rm --network host -v ... azul/zulu-openjdk-alpine:21-jre-headless ./start.sh

Using docker attach <container_id> works just fine for in- and output. However the code gets stuck at container.attach when using stdin: true. With only stdout and stderr it works fine. But I also need the send input.