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I have two Docker containers, one running the NATS I/O server and the other acting as a client. Both containers are isolated from each other. I want the client to connect to the NATS server, but I'm unsure which address I should use to establish the connection.

The line causing confusion in my client code is:

s = natsConnection_ConnectTo(&conn, "nats://localhost:4222");

What address should I use to make the client successfully connect to the NATS server running in the separate Docker container?

Any help would be appreciated!

Mephisto_08
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  • Not sure if it's allowed, but maybe just forward both containers to the same host port? https://stackoverflow.com/a/62125889/4165552 – pptaszni Jul 24 '23 at 08:20

1 Answers1

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Option 1

You can forward the port of the docker container running the server docker run -p 4222:4222 to the host and then access it via the client docker container through host.docker.internal by using docker run --add-host=host.docker.internal:host-gateway

https://medium.com/@TimvanBaarsen/how-to-connect-to-the-docker-host-from-inside-a-docker-container-112b4c71bc66

Option 2

Another option would be to create a network for the containers to share.

https://docs.docker.com/network/network-tutorial-standalone/

Option 3

An easy way to form a network is to pack them both into one docker compose file. Then you can access them by their respective service names.

https://docs.docker.com/compose/networking/

b2f
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