Can't connect RabbitMQ to my app from docker [duplicate] - asp.net

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Connecting to rabbitmq docker container from service in another container
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Closed last year.
I am currently stuck with this problem for about a week and really can't find an appropriate solution. The problem is that when I try to connect to dockerized RabbitMQ it gives me the same error every time:
wordofthedayapp-wordofthedayapp-1 | [40m[1m[33mwarn[39m[22m[49m: MassTransit[0]
wordofthedayapp-wordofthedayapp-1 | Connection Failed: rabbitmq://localhost/
wordofthedayapp-wordofthedayapp-1 | RabbitMQ.Client.Exceptions.BrokerUnreachableException: None of the specified endpoints were
reachable
wordofthedayapp-wordofthedayapp-1 | ---> System.AggregateException: One or more errors occurred. (Connection failed)
wordofthedayapp-wordofthedayapp-1 | ---> RabbitMQ.Client.Exceptions.ConnectFailureException: Connection failed
wordofthedayapp-wordofthedayapp-1 | ---> System.TimeoutException: The operation has timed out.
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.Impl.TaskExtensions.TimeoutAfter(Task task, TimeSpan timeout)
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.Impl.SocketFrameHandler.ConnectOrFail(ITcpClient socket, AmqpTcpEndpo
int endpoint, TimeSpan timeout)
wordofthedayapp-wordofthedayapp-1 | --- End of inner exception stack trace ---
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.Impl.SocketFrameHandler.ConnectOrFail(ITcpClient socket, AmqpTcpEndpo
int endpoint, TimeSpan timeout)
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.Impl.SocketFrameHandler.ConnectUsingAddressFamily(AmqpTcpEndpoint end
point, Func`2 socketFactory, TimeSpan timeout, AddressFamily family)
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.Impl.SocketFrameHandler.ConnectUsingIPv4(AmqpTcpEndpoint endpoint, Fu
nc`2 socketFactory, TimeSpan timeout)
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.Impl.SocketFrameHandler..ctor(AmqpTcpEndpoint endpoint, Func`2 socket
Factory, TimeSpan connectionTimeout, TimeSpan readTimeout, TimeSpan writeTimeout)
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.Framing.Impl.IProtocolExtensions.CreateFrameHandler(IProtocol protoco
l, AmqpTcpEndpoint endpoint, Func`2 socketFactory, TimeSpan connectionTimeout, TimeSpan readTimeout, TimeSpan writeTimeout)
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.ConnectionFactory.CreateFrameHandler(AmqpTcpEndpoint endpoint)
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.EndpointResolverExtensions.SelectOne[T](IEndpointResolver resolver, F
unc`2 selector)
wordofthedayapp-wordofthedayapp-1 | --- End of inner exception stack trace ---
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.EndpointResolverExtensions.SelectOne[T](IEndpointResolver resolver, F
unc`2 selector)
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.ConnectionFactory.CreateConnection(IEndpointResolver endpointResolver
, String clientProvidedName)
wordofthedayapp-wordofthedayapp-1 | --- End of inner exception stack trace ---
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.ConnectionFactory.CreateConnection(IEndpointResolver endpointResolver
, String clientProvidedName)
wordofthedayapp-wordofthedayapp-1 | at RabbitMQ.Client.ConnectionFactory.CreateConnection(IList`1 hostnames, String clientPr
ovidedName)
wordofthedayapp-wordofthedayapp-1 | at MassTransit.RabbitMqTransport.Integration.ConnectionContextFactory.CreateConnection(I
Supervisor supervisor)
Here you can find my docker-compose.yml:
version: '3.9'
services:
rabbitmq:
image: rabbitmq:3.9-management
hostname: rabbitmq
volumes:
- "~/.docker-conf/rabbitmq/data/:/var/lib/rabbitmq/"
- "~/.docker-conf/rabbitmq/log/:/var/log/rabbitmq"
ports:
- 5672:5672
- 15672:15672
expose:
- 5672
- 15672
environment:
- RABBITMQ_DEFAULT_USER=guest
- RABBITMQ_DEFAULT_PASS=guest
healthcheck:
test: [ "CMD", "rabbitmqctl", "status", "-f", "http://localhost:15672"]
interval: 5s
timeout: 20s
retries: 5
networks:
- app
ms-sql-server:
container_name: ms-sql-server
image: mcr.microsoft.com/mssql/server:2019-latest
user: root
volumes:
- "appdb:/var/opt/mssql/data"
environment:
ACCEPT_EULA: "Y"
SA_PASSWORD: "Password123!"
MSSQL_PID: Express
ports:
- 1433:1433
healthcheck:
test: ["CMD" ,"ping", "-h", "localhost"]
timeout: 20s
retries: 10
networks:
- app
wordofthedayapp:
build:
dockerfile: WordOfTheDay.Api/Dockerfile
image: wordofthedayapp
environment:
DbServer: "ms-sql-server"
DbPort: "1433"
DbUser: "sa"
Password: "Password123!"
Database: "appdb"
ports:
- 5001:80
restart: on-failure
depends_on:
- rabbitmq
networks:
- app
volumes:
appdb:
networks:
app:
My appsettings string:
{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*",
"ConnectionStrings": {
"WordContext": "Server=ms-sql-server;Database=master;User=sa;Password=Password123!;MultipleActiveResultSets=true;Integrated Security=false;TrustServerCertificate=true",
"RabbitMQHost": "amqp://elias:123456#localhost:5672"
}
}
This is how it works in the app using MassTransit:
public static void AddConfiguredMassTransit(this IServiceCollection services, string host)
{
services.AddMassTransit(Configuration =>
{
Configuration.UsingRabbitMq((context, config) =>
{
config.Host(host);
});
});
services.AddMassTransitHostedService();
}
services.AddConfiguredMassTransit(Configuration.GetConnectionString("RabbitMQHost"));
I hope at least anyone knows what is wrong with this code because I really tired trying to fix it and browsing internet for solution. Thank you in advance!
P.S. Important information! Everything works perfect when I test it locally without a docker, but when I try to dockerize the app this happens.

Answer 1

If you are testing locally, the host is likely localhost since Docker is exposing the port to the local machine. When running in a container, however, the virtual network should have a hostname of rabbitmq, which would need to be used instead of localhost when running inside a container on the same network.
Since the log shows:
Connection Failed: rabbitmq://localhost/
I'm guessing you aren't updating the host name when running inside a container.
You can determine if your application is running in a container easily:
bool IsRunningInContainer => bool.TryParse(Environment.GetEnvironmentVariable("DOTNET_RUNNING_IN_CONTAINER"), out var inDocker) && inDocker;
Then, in your configuration:
var host = IsRunningInContainer ? "rabbitmq" : "localhost";