CODEWITHSUNDEEP
dockermicroservicesnestjs
TheAlphaKarp
TheAlphaKarp

Reputation: 209

Nestjs Docker returns connection refused when accessing microservice

I am trying to set up a microservice cluster with docker and Nestjs but every time I try to call a microservice it gives me back a connection refused.

version: "3.8"
services: 
  api:
    build:
      dockerfile: Dockerfile
      context: .
    depends_on: 
      - postgres
      - microservice
    ports:
      - "8080:3000"
    environment:
      DATABASE_URL: postgres://user:password@postgres:5432/db
      NODE_ENV: development
      PORT: 3000
    networks:
      - local

  postgres:
    image: postgres:10.4
    ports:
      - "35000:5432"
    environment:
      POSTGRES_USER: user
      POSTGRES_PASSWORD: password
      POSTGRES_DB: db
    networks:
      - local

  microservice:
    build:
      dockerfile: Dockerfile
      context: ../microservice
    depends_on: 
      - postgres
    ports:
      - "8877:9000"
    environment:
      DATABASE_URL: postgres://user:password@postgres:5432/db
      NODE_ENV: development
    networks:
      - local

networks:
  local:
    driver: bridge

In my main application code I connect to the microservice through the following code:

constructor() {
    this.client = ClientProxyFactory.create({
      transport: Transport.TCP,
      options: {
        host: '127.0.0.1',
        port: 8877
      }
    })
  }

And in the microservice I use the following code to set it up:

const microserviceOptions = {
  transport: Transport.TCP,
  options: {
    host: '127.0.0.1',
    port: 8877
  }
}

async function bootstrap() {
  const app = await NestFactory.createMicroservice(AppModule, microserviceOptions);
  app.listen(() => {
    logger.log('Microservice is listening ...');
  });
}
bootstrap();

However, when I perform a request my main container gives the following error back:

[Nest] 19 - 03/24/2021, 8:00:36 AM [ExceptionsHandler] connect ECONNREFUSED 127.0.0.1:8877 +329786ms

api_1 | Error: connect ECONNREFUSED 127.0.0.1:8877

api_1 | at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1144:16)

Upvotes: 0

Views: 4883

Answers (1)

eitann
eitann

Reputation: 1260

I noticed two potential problems:

  1. In case you main app runs in a container within the same network of your microservice, try to set the host to: microservice (the name of the service in the docker compose file) instead of 127.0.0.1 and the port to the internal ip of the microservice, in your case: 9000

  2. You are telling the microservice to listen on port 8877, i guess you need to listen to 9000 as your docker compose file suggests.

Upvotes: 2

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