How to set domain name for services in Kubernetes

Problem: I ran each services in different container. It’s easy to call service in IP. But this way is foolish. So need to improve to set domain name for services in Kubernetes 😭

What are Microservices?

Microservices are an architectural and organizational approach to software development where software is composed of small independent services that communicate over well-defined APIs. These services are owned by small, self-contained teams.
Microservices architectures make applications easier to scale and faster to develop, enabling innovation and accelerating time-to-market for new features.

Solution: it’s easy to scale up/down services. Refence below to set domain name for services in Kubernetes.

A. each Services:

Product service

    apiVersion: v1
    kind: Service
    metadata:
      name: product-service
    spec:
      ports:
      - port: 8070
        targetPort: 8070
        protocol: TCP
      selector:
        app: product

Jwt service

    apiVersion: v1
    kind: Service
    metadata:
      name: jwt-service
    spec:
      ports:
      - port: 8080
        targetPort: 8080
        protocol: TCP
      selector:
        app: jwt

Frontendpage service

    apiVersion: v1
    kind: Service
    metadata:
      name: frontendpage-service
    spec:
      ports:
      - port: 8090
        targetPort: 8090
        protocol: TCP
      selector:
        app: frontendpage-pod

mysql service

    apiVersion: v1
    kind: Service
    metadata:
      name: mysql-service
    spec:
      ports:
      - port: 3306
        targetPort: 3306
        protocol: TCP
      selector:
        app: mysql

Ingress controller:

A API object that manages external access to the services in a cluster, typically HTTP. Ingress can provide load balancing, SSL termination and name-based virtual hosting.

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: frontendpage-ingress
  namespace: default
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - host: demopage
    http:
      paths:
      - path: /
        backend:
          serviceName: frontendpage-service
          servicePort: 8090
      - path: /jwt
        backend:
          serviceName: jwt-service
          servicePort: 8080
      - path: /ajaxProduct
        backend:
          serviceName: product-service
          servicePort: 8070
      - path: /h
        backend:
          serviceName: helloworld-service
          servicePort: 3000

nginx. ingress. kubernetes. io/rewrite-target:/ = It means prefix match “/” If you skip this annotation. The Ingress only match “/”

namespace = All of service follow this ingress controller rule. 😁