Can't create connection to RabbitMq instance in Docker

Question

I've followed How to use this image , pulling and executing the latest image in Docker. The sender application is not dockerized, hence running in the local environment.

docker pull rabbitmq
docker run -d --hostname my-rabbit --name bunny-queue rabbitmq:3

It seems to be running as expected and I can verify in the logs that the host name and database are as described in the article. I see no errors logged, only a few warnings about indices being reinitialized.

node: rabbit@my-rabbit
database dir: /var/lib/rabbitmq/mnesia/rabbit@my-rabbit

Then, I set up a factory and try to create a connection (as shown eg here ).

ConnectionFactory factory = new() { HostName = "my-rabbit" };
using IConnection connection = factory.CreateConnection();
using IModel channel = connection.CreateModel();

I've tried different values for the HostName field (both with and without explicit port). I googled the exact exception thrown ( None of the specified endpoints were reachable ). I've never had issues with this part before so I sense it's related to me running the bunny locally in the Docker. The closest hit was this issue but for a remote server, while I'm running the local, default values as exemplified in the official docs. Someone suggests to do a full metal jacket configuration of the factory. I failed to make it work that way and I sense that the default values in the official docs should work for the basic scario, which implied that the issue is elsewhere.

I also tried to fire up another image including the managment tools as shown here . When I access (as a guest), I see that the AMQP protocol is bound to :: on port 5672 . No errors, warnings nor issues reported as far I can tell.

docker run -it --rm --name rabbitmq -p 5672:5672 -p 15672:15672 rabbitmq:3.9-management

Not sure how to investigate further.

Answer 1

You have several options:

1. Bind ports of the container to your host's port and then connect to your host's ports. To bind container ports to your host ports, use the -p switch when starting the container
2. Run your docker container in "host" network mode and connect to your host's ports. This can be achieved by specifying the --network host option. All ports of your application will be available as if you had started the application natively on the host.
3. Create a docker network and run both RabbitMQ and your application inside the same network. Connect to the rabbitmq container's ports. To create a docker network, run docker network create name and then start your containers with --network name .
4. Define your containers in a docker-compose file. All containers in a file will automatically share the same network. You can define custom networks too and connect certain containers to specific networks only.

As an example of #1, the bunny should be executed using the following.

docker run -detach --hostname rabbitmq --publish 5672:5672 --name bunny rabbitmq:3

Then, in the factory, the host of the local environment needs to be passed.

ConnectionFactory factory = new() { HostName = "localhost" };
using IConnection connection = factory.CreateConnection();