Kubernetes Ingress & Ingress Controller 範例#1 (app1)

01_deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app1-deployment
  namespace: default
  labels:
    app: app1
spec:
  replicas: 3
  selector:
    matchLabels:
      app: app1
  template:
    metadata:
      labels:
        app: app1
    spec:
      containers:
        - name: app1
          image: "witlab/ingress-training-app1:v0.1"
          imagePullPolicy: IfNotPresent
          ports:
            - name: http
              containerPort: 8080
              protocol: TCP
          resources:
            {}

02_service.yaml

apiVersion: v1
kind: Service
metadata:
  name: app1-service
  namespace: default
  labels:
    app: app1
spec:
  type: ClusterIP
  ports:
    - port: 80
      targetPort: http
      protocol: TCP
      name: http
  selector:
    app: app1

03_ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: app1-ing
  namespace: default
  labels:
    app: app1
spec:
  rules:
    - host: app1.example.com
      http:
        paths:
          - path: /
            backend:
              serviceName: app1-service
              servicePort: http

Dockerfile

From busybox:glibc

RUN mkdir -p /root/workplace
COPY ./app1 /root/workplace/app1
RUN chmod +x /root/workplace/app1

WORKDIR /root/workplace
ENTRYPOINT ["/root/workplace/app1"]

main.go

package main

import (
	"fmt"
	"log"
	"net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
	log.Println("receive a request")
	fmt.Fprintf(w, "<h1>Hello, I am app1!</h1> Developed using <b>Golang</b>")
}

func main() {
	http.HandleFunc("/", handler)
	http.ListenAndServe(":8080", nil)
}

Makefile

## usage: make build repos=xxxx tag=v0.1
# default
repos=docker.io/witlab/ingress-training-app1
tag=v0.1

all: push

build:
	GOOS=linux GOARCH=amd64 go build -o app1 main.go

buildimage: build 
	docker build -t $(repos):$(tag) .

push: buildimage
	docker push $(repos):$(tag)

pull:
	docker pull $(repos):$(tag)

test:
	go test -v ./...