What should be the host name in nestjs hybrid microservice when deployed on Kubernetes - kubernetes

Question

Tech stack -
nestjs - 2 microservice
kubernetes - AWS EKS
Ingress - nginx
Hybrid
const app = await NestFactory.create(AppModule);
const microservice = app.connectMicroservice<MicroserviceOptions>(
{
transport: Transport.TCP,
options: {
host: process.env.TCP_HOST,
port: parseInt(process.env.TCP_EVALUATION_PORT),
},
},
{ inheritAppConfig: true },
);
await app.startAllMicroservices();
await app.listen(parseInt(config.get(ConfigEnum.PORT)), '0.0.0.0');
env
TCP_HOST: '0.0.0.0'
TCP_CORE_PORT: 8080
TCP_EVALUATION_PORT: 8080
Error
"connect ECONNREFUSED 0.0.0.0:8080"
Do I need to expose this port in docker or add it somewhere in the security group?
Or may be need to pass a different host?
Note: App is deployed properly without any error and HTTP Rest API seems to be working fine but not the TCP #messagePattern!
Thanks

Answer 1

Create a service to match the instances you want to connect to and use the service name.

Answer 2

Basically in Hybrid application, main.ts configuration will be like below -
service1
const app = await NestFactory.create(AppModule);
const microservice = app.connectMicroservice<MicroserviceOptions>(
{
transport: Transport.TCP,
options: {
host: '0.0.0.0',
port: 6200,
},
},
{ inheritAppConfig: true },
);
await app.startAllMicroservices();
await app.listen(6300, '0.0.0.0');
In client
ClientsModule.register([
{
name: 'service1',
transport: Transport.TCP,
options: {
host: 'service1',
port: 6200,
},
},
]),