Cannot start two instances of Microservice using package #golevelup/nestjs-rabbitmq - nestjs

Question

I would build a publish/subscribe message pattern between microservices using nestjs and rabbitmq. The problem with the built-in NestJS microservices Rabbitmq does not support pub/sub pattern,but it's easy to start multiple instances of microservice to test random queue message. And i tried to use #golevelup/nestjs-rabbitmq to implement the features. The problem with this package is that it seem like the port 3000 is the default using by the package and I don't know where and how I could change the port. I couldn't start multiple instances of consummers to test the pattern.
// Module Subcriber
import { RabbitMQModule } from '#golevelup/nestjs-rabbitmq';
import { Module } from '#nestjs/common';
import { SomeEventConsumerModule1Module } from './some-event-consumer-module1/some-event-consumer-module1.module';
#Module({
imports: [
RabbitMQModule.forRoot(RabbitMQModule, {
exchanges: [
{
name: 'amq.topic',
type: 'topic', // check out docs for more information on exchange types
},
],
uri: 'amqp://guest:guest#localhost:5672', // default login and password is guest, and listens locally to 5672 port in amqp protocol
// connectionInitOptions: { wait: false },
channels: {
'channel-1': {
prefetchCount: 15,
default: true,
},
'channel-2': {
prefetchCount: 2,
},
},
}),
SomeEventConsumerModule1Module,
],
})
export class EventsModule {}
Here is the service of Subscriber to get messesage from publisher.
// Service Subscriber
// imports
import { RabbitSubscribe } from '#golevelup/nestjs-rabbitmq';
import { Injectable } from '#nestjs/common';
import { ConsumeMessage, Channel } from 'amqplib'; // for type safety you will need to install package first
// ... so on
#Injectable()
export class SomeEventConsumerModule1Service {
constructor() {} // other module services if needs to be injected
#RabbitSubscribe({
exchange: 'amq.direct',
routingKey: 'direct-route-key', // up to you
queue: 'queueNameToBeConsumed',
errorHandler: (channel: Channel, msg: ConsumeMessage, error: Error) => {
console.log(error);
channel.reject(msg, false); // use error handler, or otherwise app will crush in not intended way
},
})
public async onQueueConsumption(msg: {}, amqpMsg: ConsumeMessage) {
const eventData = JSON.parse(amqpMsg.content.toString());
// do something with eventData
console.log(
`EventData: ${
eventData.bookName
}, successfully consumed!${amqpMsg.content.toString()}`,
);
}
// ... and in the same way
}
The here is the code of publisher
//app module
import { Module } from '#nestjs/common';
import { ClientsModule, Transport } from '#nestjs/microservices';
import { AppController } from './app.controller';
import { AppService } from './app.service';
#Module({
imports: [
ClientsModule.register([
{
name: 'GREETING_SERVICE',
transport: Transport.RMQ,
options: {
urls: ['amqp://localhost:5672'],
queue: 'queueNameToBeConsumed',
},
},
]),
],
controllers: [AppController],
providers: [AppService],
})
export class AppModule {}
// App service
import { Inject, Injectable } from '#nestjs/common';
import { ClientProxy } from '#nestjs/microservices';
#Injectable()
export class AppService {
constructor(#Inject('GREETING_SERVICE') private client: ClientProxy) {}
async testEvent() {
this.client.emit('book-created', {
bookName: 'The Way Of Kings',
author: 'Brandon Sanderson',
});
}
}
the Error message display when trying to start the second instance
ERROR [Server] Error: listen EADDRINUSE: address already in use 127.0.0.1:3000
Error: listen EADDRINUSE: address already in use 127.0.0.1:3000
at Server.setupListenHandle [as _listen2] (node:net:1380:16)
at listenInCluster (node:net:1428:12)
at GetAddrInfoReqWrap.doListen (node:net:1567:7)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:dns:85:8)
I don't know why the port 3000 is using by the service and how to change the port.