Drone 搭配 Kubernetes 部署 Go 語言項目

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package main

import (
    "log"
    "net/http"
    "os"
    "strings"
)

var version = "master"

func showVersion(w http.ResponseWriter, r *http.Request) {
    log.Println(version)
    w.Write([]byte(version))
}

func sayHello(w http.ResponseWriter, r *http.Request) {
    message := r.URL.Path
    message = strings.TrimPrefix(message, "/")
    message = "Hello, drone got the message: " + message
    log.Println(message)
    w.Write([]byte(message))
}

func main() {
    // use PORT environment variable, or default to 8080
    port := "8080"
    if fromEnv := os.Getenv("PORT"); fromEnv != "" {
        port = fromEnv
    }
    http.HandleFunc("/version", showVersion)
    http.HandleFunc("/", sayHello)
    log.Println("Listen server on " + port + " port")
    if err := http.ListenAndServe(":"+port, nil); err != nil {
        log.Fatal(err)
    }
}

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build:
ifneq ($(DRONE_TAG),)
    go build -v -ldflags "-X main.version=$(DRONE_TAG)" -a -o release/linux/amd64/hello
else
    go build -v -ldflags "-X main.version=$(DRONE_COMMIT)" -a -o release/linux/amd64/hello
endif

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pipeline:
  build_linux_amd64:
    image: golang:1.10
    group: build
    environment:
      - GOOS=linux
      - GOARCH=amd64
      - CGO_ENABLED=0
    commands:
      - cd example19-deploy-with-kubernetes && make build

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FROM plugins/base:multiarch

ADD example19-deploy-with-kubernetes/release/linux/amd64/hello /bin/

ENTRYPOINT ["/bin/hello"]

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docker_golang:
  image: plugins/docker:17.12
  secrets: [ docker_username, docker_password ]
  repo: appleboy/golang-http
  dockerfile: example19-deploy-with-kubernetes/Dockerfile
  default_tags: true
  when:
    event: [ push, tag ]

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$ kubectl describe po/frontend-9f5ccc8d4-8n9xq | grep SecretName | grep token
    SecretName:  default-token-r5xdx

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$ kubectl get secret default-token-r5xdx -o yaml | egrep 'ca.crt:|token:'

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deploy:
  image: sh4d1/drone-kubernetes
  kubernetes_template: example19-deploy-with-kubernetes/deployment.yml
  kubernetes_namespace: default
  secrets: [ kubernetes_server, kubernetes_cert, kubernetes_token ]

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apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: frontend
  # these labels can be applied automatically
  # from the labels in the pod template if not set
  labels:
    app: gotraining
    tier: frontend
spec:
  # this replicas value is default
  # modify it according to your case
  replicas: 3
  # selector can be applied automatically
  # from the labels in the pod template if not set
  # selector:
  #   app: guestbook
  #   tier: frontend
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
  minReadySeconds: 5
  template:
    metadata:
      labels:
        app: gotraining
        tier: frontend
    spec:
      containers:
      - name: go-hello
        image: appleboy/golang-http:VERSION
        imagePullPolicy: Always
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        ports:
        - containerPort: 8080
        env:
        - name: FOR_GODS_SAKE_PLEASE_REDEPLOY
          value: 'THIS_STRING_IS_REPLACED_DURING_BUILD'

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ifneq ($(DRONE_TAG),)
    VERSION ?= $(DRONE_TAG)
else
    VERSION ?= latest
endif

prepare:
    sed -ie "s/VERSION/$(VERSION)/g" deployment.yml

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env:
- name: FOR_GODS_SAKE_PLEASE_REDEPLOY
  value: 'THIS_STRING_IS_REPLACED_DURING_BUILD'

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prepare:
    sed -ie "s/VERSION/$(VERSION)/g" deployment.yml
    sed -ie "s/THIS_STRING_IS_REPLACED_DURING_BUILD/$(shell date)/g" deployment.yml
    cat deployment.yml