自动化部署

本文档介绍如何使用Jenkins和Kubernetes实现自动化部署。

Jenkins流水线配置

Jenkinsfile示例

pipeline {
    agent any
    
    environment {
        DOCKER_REGISTRY = 'registry.example.com'
        IMAGE_NAME = 'myapp'
        K8S_NAMESPACE = 'production'
    }
    
    stages {
        stage('Checkout') {
            steps {
                git branch: 'main', url: 'https://github.com/company/myapp.git'
            }
        }
        
        stage('Test') {
            steps {
                sh 'npm ci'
                sh 'npm test'
                sh 'npm run lint'
            }
        }
        
        stage('Build Image') {
            steps {
                script {
                    def image = docker.build("${DOCKER_REGISTRY}/${IMAGE_NAME}:${env.BUILD_NUMBER}")
                    docker.withRegistry("https://${DOCKER_REGISTRY}", 'docker-registry-credentials') {
                        image.push()
                        image.push('latest')
                    }
                }
            }
        }
        
        stage('Deploy') {
            steps {
                sh '''
                    kubectl set image deployment/myapp-deployment \\
                        myapp=${DOCKER_REGISTRY}/${IMAGE_NAME}:${BUILD_NUMBER} \\
                        -n ${K8S_NAMESPACE}
                    kubectl rollout status deployment/myapp-deployment -n ${K8S_NAMESPACE}
                '''
            }
        }
    }
    
    post {
        success {
            slackSend channel: '#deployments',
                     color: 'good',
                     message: "✅ 部署成功: ${env.JOB_NAME} - ${env.BUILD_NUMBER}"
        }
        failure {
            slackSend channel: '#deployments',
                     color: 'danger', 
                     message: "❌ 部署失败: ${env.JOB_NAME} - ${env.BUILD_NUMBER}"
        }
    }
}

Kubernetes部署配置

Deployment配置

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-deployment
  namespace: production
spec:
  replicas: 3
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers:
      - name: myapp
        image: registry.example.com/myapp:latest
        ports:
        - containerPort: 3000
        env:
        - name: NODE_ENV
          value: "production"
        - name: DB_HOST
          valueFrom:
            secretKeyRef:
              name: app-secrets
              key: db-host
        resources:
          requests:
            memory: "256Mi"
            cpu: "250m"
          limits:
            memory: "512Mi" 
            cpu: "500m"
        livenessProbe:
          httpGet:
            path: /health
            port: 3000
          initialDelaySeconds: 30
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /ready
            port: 3000
          initialDelaySeconds: 5
          periodSeconds: 5

Service配置

apiVersion: v1
kind: Service
metadata:
  name: myapp-service
  namespace: production
spec:
  selector:
    app: myapp
  ports:
  - protocol: TCP
    port: 80
    targetPort: 3000
  type: ClusterIP