# Step 04. Canary Deploy

Canary Deploy 시나리오

1. 기존의 서비스 중이던 Application Instance는 5개
2. 신규 기능을 추가하여, 정상동작 확인과 사용성을 확인 하기 위해 Canary 적용
3. 신규 버전의 Application Instance 1개를 배포
4. 기존 버전의  Instance 숫자를 4개로 줄임
5. 동작확인과 사용성 확인후 신규 버전으로 전체 서비스 교체

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# Deployment-canary.yaml 작성

spec.strategy.type: RollingUpdate

apiVersion: apps/v1
kind: Deployment
metadata:
  name: spring-boot-cicd-demo-canary
  labels:
    app: spring-boot-cicd-demo
spec:
  replicas: 1
  selector:
    matchLabels:
      app: spring-boot-cicd-demo
  strategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: spring-boot-cicd-demo
    spec:
      imagePullSecrets:
        - name: harbor-secret
      containers:
      - name: spring-boot-cicd-demo
        image: labs-registry.cloudzcp.io/[edu1]/spring-boot-cicd-demo:prod
        ports:
        - containerPort: 8080
          name: tomcat
        resources:
          limits:
            cpu: 500m
            memory: 512Mi
          requests:
            cpu: 10m
            memory: 256Mi
        readinessProbe:
          failureThreshold: 3
          httpGet:
            path: /
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 40
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 3
        livenessProbe:
          failureThreshold: 3
          httpGet:
            path: /
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 40
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 3

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# Pipeline 작성

sam-zcp-edu-99-canary 이름으로 Pipeline작성

Jenkins 참조

Pipeline Script Path 수정 : jenkins-pipeline/canary-pipeline

jenkins script 작성

@Library('retort-lib') _
def label = "jenkins-${UUID.randomUUID().toString()}"
 
def ZCP_USERID = 'edu99'
def DOCKER_IMAGE = 'edu99/spring-boot-cicd-demo'
def K8S_NAMESPACE = 'edu01'
def VERSION = 'prod'
def TYPE = 'deployment'
def DEPLOY_NAME = 'spring-boot-cicd-demo' // Previous Deployment
...
        stage('DEPLOY') {
            container('kubectl') {
                // canary deployment 생성
                kubeCmd.apply file: 'k8s/deployment-canary.yaml', namespace: K8S_NAMESPACE, wait: 300
                // 기존 deployment 의 Instance 수를 4개로 조정
                kubeCmd.scale type: TYPE, name: DEPLOY_NAME, replicas: 4, namespace: K8S_NAMESPACE
            }
        }
...

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실행

# Canary Deploy 조정

# Pipeline 작성

sam-zcp-edu-99-adjustment 이름으로 Pipeline작성

Jenkins 참조

Pipeline Script Path 수정 : jenkins-pipeline/canary-adjustment-pipeline

매개변수 추가

매개변수 명	Default Value	설명
ORIGIN_DEPLOYMENT_NAME	spring-boot-cicd-demo	기존에 배포된 Deployment 이름
CANARY_DEPLOYMENT_NAME	spring-boot-cicd-demo-canary	Canary 신규 Deployment 이름
ORIGIN_INSTANCE_COUNT		Previous Instance 값
CANARY_INSTANCE_COUNT		New Instance 값

jenkins script 작성

@Library('retort-lib') _
def label = "jenkins-${UUID.randomUUID().toString()}"
 
def ZCP_USERID = 'edu99'
def K8S_NAMESPACE = 'ns-zcp-edu-99'
def TYPE = 'deployment'

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

    node(label) {
        stage('kubectl') {
            container('kubectl') {
                // 기존 Deployment 의 Instance 수를 ORIGIN_INSTANCE_COUNT 값으로 변경
                kubeCmd.scale type: TYPE, name: ORIGIN_DEPLOYMENT_NAME, replicas: ORIGIN_INSTANCE_COUNT, namespace: K8S_NAMESPACE
                // Canary Deployment 의 Instance 수를 CANARY_INSTANCE_COUNT 값으로 변경
                kubeCmd.scale type: TYPE, name: CANARY_DEPLOYMENT_NAME, replicas: CANARY_INSTANCE_COUNT, namespace: K8S_NAMESPACE
            }
        }
    }
}

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실행

Step 04. Canary Deploy