从 docker-compose.yml 文件创建 kubernetes yml 文件

Question

I have this docker-compose.yml file which I am using to run up three microservices and one api gateway

version: '3'
services: 
    serviceone:
        container_name: serviceone
        restart: always
        build: serviceone/
        ports: 
            - '3000:3000'
    servicetwo:
        container_name: servicetwo
        restart: always
        build: servicetwo/
        ports: 
            - '3001:3001'   
    servicethree:
        container_name: servicethree
        restart: always
        build: servicethree/
        ports: 
             - '3002:3003'    
    apigateway:
        container_name: timezoneapigateway
        restart: always
        build: timezone/
        ports: 
            - '8080:8080'
        links: 
            - serviceone
            - servicetwo
            - servicethree   

Now I want to deploy these dockerimages in one pod in kubernetes so that the api gateway can connect with all the three microservices ,current version of api gateway is working but I am really not getting even a slightest hint of doing this in kubernetes. I am really new to kubernetes can anyone tell me how to design a kubernetes yml file to achieve this

Answer 1

You don't have to run all your service in the same pod. The standard in Kubernetes is to have separate deployments and services for all apps. Here is a deployment manifest for serviceone but you can easily modify it for servicetwo , servicethree and apigateway

apiVersion: apps/v1
kind: Deployment
metadata:
  name: serviceone
  labels:
    app: serviceone
spec:
  replicas: 1
  selector:
    matchLabels:
      app: serviceone
  template:
    metadata:
      labels:
        app: serviceone
    spec:
      containers:
      - name: serviceone
        image: serviceone:latest
        ports:
        - containerPort: 3001

And the same goes for the service manifest

apiVersion: v1
kind: Service
metadata:
  name: serviceone
spec:
  selector:
    app: serviceone
  ports:
  - protocol: TCP
    port: 3001
    targetPort: 3001

Your services will be accessible within the cluster like this:

serviceone:3001
servicetwo:3002
servicethree:3003
timezoneapigateway:8080