# Step 03. Rolling Update

Production 운영환경에 배포하는 방법으로 설명. Master branch사용

# Rolling update

# Deployment 수정

spec.strategy.type: Rollingupdate # 배포방식 설정
spec.strategy.rollingUpdate.maxSurge: 1 # up pod 최대 단위
spec.strategy.rollingUpdate.maxUnavailable: 1 # down pod 최대 단위

apiVersion: apps/v1
kind: Deployment
metadata:
  name: spring-boot-cicd-demo
  labels:
    app: spring-boot-cicd-demo
spec:
  replicas: 5
  selector:
    matchLabels:
      app: spring-boot-cicd-demo
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
....

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# Pipeline 작성

sam-zcp-lab-rolling 이름으로 Pipeline작성

Jenkins 참조

Pipeline 설정에서 Parameter 설정 : VERSION 처리를 위해 Pipeline에 변수 추가
General 영역에서 이 빌드는 매개변수가 있습니다. 체크
매개변수 추가 Click > String Parameter
1. 매개변수명 : VERSION
2. Default Value: develop
Pipeline 영역
1. Script Path : Production용 파일로 변경. jenkins-pipeline/rolling-pipeline
Git project의 jenkins-pipeline/rolling-pipeline 파일 편집
VERSION 변수선언 주석 처리

// def VERSION = 'develop'

Job 설정의 Deploy 변경

@Library('retort-lib') _
def label = "jenkins-${UUID.randomUUID().toString()}"
  
def ZCP_USERID='edu01'
def DOCKER_IMAGE='edu01/sam-zcp-lab'
def K8S_NAMESPACE='edu01'
// def VERSION = 'develop'
  
podTemplate(label:label,
    serviceAccount: "zcp-system-sa-${ZCP_USERID}",
    containers: [
        containerTemplate(name: 'maven', image: 'maven:3.5.2-jdk-8-alpine', ttyEnabled: true, command: 'cat'),
        containerTemplate(name: 'docker', image: 'docker:17-dind', ttyEnabled: true, command: 'dockerd-entrypoint.sh', privileged: true),
        containerTemplate(name: 'kubectl', image: 'lachlanevenson/k8s-kubectl:v1.13.6', ttyEnabled: true, command: 'cat')
    ],
    volumes: [
        persistentVolumeClaim(mountPath: '/root/.m2', claimName: 'zcp-jenkins-mvn-repo')
    ]) {
  
    node(label) {
        stage('SOURCE CHECKOUT') {
            def repo = checkout scm
        }
  
        stage('BUILD') {
            container('maven') {
                mavenBuild goal: 'clean package', systemProperties:['maven.repo.local':"/root/.m2/${ZCP_USERID}"]
            }
        }
  
        stage('BUILD DOCKER IMAGE') {
            container('docker') {
                dockerCmd.build tag: "${HARBOR_REGISTRY}/${DOCKER_IMAGE}:${VERSION}"
                dockerCmd.push registry: HARBOR_REGISTRY, imageName: DOCKER_IMAGE, imageVersion: VERSION, credentialsId: 'HARBOR_CREDENTIALS'
            }
        }
  
        stage('DEPLOY') {
            container('kubectl') {
                kubeCmd.apply file: 'k8s/service.yaml', namespace: K8S_NAMESPACE
                yaml.update file: 'k8s/deployment.yaml', update: ['.spec.template.spec.containers[0].image': "${HARBOR_REGISTRY}/${DOCKER_IMAGE}:${VERSION}"]
  
                kubeCmd.apply file: 'k8s/deployment.yaml', wait: 300, recoverOnFail: false, namespace: K8S_NAMESPACE
            }
        }
    }
}

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# 소스변경

Open file(./src/main/resource/static/css/style.css)
47 line의 색상 값 변경 (background-color: #157ed2; --> background-color: red)
Stage & Commit
Push to origin/master(Git Server)

# Rolling update 실행

Click : Build with Parameters
VERSION 입력 : rolling-1
pod 상태 확인 : kubecrl get deploy -n edu01

# Rolling rollback

# Pipeline 설정

sam-zcp-lab-rollback 이름으로 Pipeline작성

Jenkins 참조

Script Path 수정 : jenkins-pipeline/rollback-pipeline
환경구성 & Volume은 Deploy 용만 작성
Deploy rollback jenkins scrupt 작성

@Library('retort-lib') _
def label = "jenkins-${UUID.randomUUID().toString()}"
 
def ZCP_USERID = 'edu01'
def K8S_NAMESPACE = 'edu01'
def TYPE = 'deployment'
def DEPLOY_NAME = 'spring-boot-cicd-demo'

podTemplate(label:label,
    serviceAccount: "zcp-system-sa-${ZCP_USERID}",
    containers: [
        containerTemplate(name: 'kubectl', image: 'lachlanevenson/k8s-kubectl:v1.13.6', ttyEnabled: true, command: 'cat')
    ]) {

    node(label) {
        stage('ROLLBACK') {
            container('kubectl') {
                kubeCmd.rolloutUndo type: TYPE, name: DEPLOY_NAME, namespace: K8S_NAMESPACE, wait: 300
            }
        }
    }
}

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# Rollback 실행

Application의 변경된 내용 확인.

Step 03. Rolling Update
- Rolling update
- Rolling rollback
  - Pipeline 설정
  - Rollback 실행