how to connect to localhost:9092 from docker container using docker-compose and not using docker bridge

Question

I am running Kafka server on my local machine on port 9092. I am running a service in docker container using docker-compose which needs to send message to kafka server.

I tried writing my producer in service code using 'localhost' and IP as well but both are not working.

Can anyone help me to fix the issue?

Answer 1

With docker-compose:

Use the network_mode option to allow connection to localhost ports

network_mode: "host"

Without docker-compose:

Use the --net flag to allow connection to localhost ports

docker run -it --net=host

You can also use --network flag

--network="host"

According to the official Docker documentation these "give the container full access to local system services such as D-bus and is therefore considered insecure."

Of course if you containerise your service that is running on localhost:9092 then you could run that in a Docker container too and link your two Docker containers together using the --link flag:

docker run -t -d myService
docker run -t -d --link myService:myService_ref myOtherService