dotnetcore console app : rabbitmq with docker Connection refused 127.0.0.1:5672 - rabbitmq

Question

rabbit connection from console app :
var factory = new ConnectionFactory()
{
HostName = Environment.GetEnvironmentVariable("RabbitMq/Host"),
UserName = Environment.GetEnvironmentVariable("RabbitMq/Username"),
Password = Environment.GetEnvironmentVariable("RabbitMq/Password")
};
using (var connection = factory.CreateConnection()) // GETTING ERROR HERE
using (var channel = connection.CreateModel())
{
channel.QueueDeclare(queue: "rss",
durable: fa...
I'm getting this error :
Unhandled Exception:
RabbitMQ.Client.Exceptions.BrokerUnreachableException: None of the
specified endpoints were reachable --->
RabbitMQ.Client.Exceptions.ConnectFailureException: Connection failed
---> System.Net.Internals.SocketExceptionFactory+ExtendedSocketException:
Connection refused 127.0.0.1:5672
my docker-compose.yml file :
version: '3'
services:
message.api:
image: message.api
build:
context: ./message_api
dockerfile: Dockerfile
container_name: message.api
environment:
- "RabbitMq/Host=rabbit"
- "RabbitMq/Username=guest"
- "RabbitMq/Password=guest"
depends_on:
- rabbit
rabbit:
image: rabbitmq:3.7.2-management
hostname: rabbit
ports:
- "15672:15672"
- "5672:5672"
rsscomparator:
image: rsscomparator
build:
context: ./rss_comparator_app
dockerfile: Dockerfile
container_name: rsscomparator
environment:
- "RabbitMq/Host=rabbit"
- "RabbitMq/Username=guest"
- "RabbitMq/Password=guest"
depends_on:
- rabbit
I'm using dotnetcore console app. When I use this app in docker I'm getting error. I can reach rabbitmq web browser(http://192.168.99.100:15672) but app can not reach.

Answer 1

You are trying to connect from your container app to your rabbitmq app.
You try to achieve this with 127.0.0.1:5672 in your console app container.
But this is pointing to your localhost inside this container, and not to your localhost on your host.
You are deploying your services using the same docker-compose without specifying network settings which means they are all deployed inside the same docker bridge network. This will allow you to let the containers communicate with each other using their container or service names.
So try to connect to rabbit:5672 instead of 127.0.0.1:5672. This name will be translated to the container IP (172.xx.xx.xx) which means you'll create a private connection between your containers.