[k8s] Canary Deployment

Pod를 배포(업데이트)하는 방법

• Blue, Green update
• Canary update
• Rolling update

 

Canary 배포란?

• 기존 버전을 유지한 채로 일부 버전만 신규 버전으로 올려서 신규 버전에 버그나 이상은 없는지 확인
• definition

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mainui-canary
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mainui
      version: canary
  template:
    metadata:
      labels:
        app: mainui
        version: canary
    spec:
      containers:
      - name: mainui
        image: nginx:1.15
        ports:
        - containerPort: 80

 

[ Hands - on ] : label를 이용한 Canary 배포

• Deployment로 pod 생성 및 확인

vi mainui-stable.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mainui-stable
spec:
  replicas: 2
  selector:
    matchLabels:
      app: mainui
      version: stable
  template:
    metadata:
      labels:
        app: mainui
        version: stable
    spec:
      containers:
      - name: mainui
        image: nginx:1.14
        ports:
        - containerPort: 80

kubectl create -f mainui-stable.yaml

kubectl get pods --show-lables

NAME                           READY   STATUS    RESTARTS   AGE   LABELS
mainui-stable-7dd79788-cs88h   1/1     Running   0          73s   app=mainui,pod-template-hash=7dd79788,version=stable
mainui-stable-7dd79788-ncp6x   1/1     Running   0          73s   app=mainui,pod-template-hash=7dd79788,version=stable

 

• 단일 진입점 생성 및 접속 확인

 

vi mainui-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: mainui-svc
spec:
  selector:
    app: mainui
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80

kubectl create -f mainui-service.yaml

kubectl describe service mainui-svc

Name:              mainui-svc
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          app=mainui
Type:              ClusterIP
IP Family Policy:  SingleStack
IP Families:       IPv4
IP:                10.98.12.13
IPs:               10.98.12.13
Port:              <unset>  8080/TCP
TargetPort:        8080/TCP
Endpoints:         192.168.11.82:80,192.168.221.17:80
Session Affinity:  None
Events:            <none>

curl 10.98.12.13

 

• Canary version pod 생성

 

vi mainui-canary.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mainui-canary
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mainui
      version: canary
  template:
    metadata:
      labels:
        app: mainui
        version: canary
    spec:
      containers:
      - name: mainui
        image: nginx:1.15
        ports:
        - containerPort: 80

kubectl create -f mainui-canary.yaml

kubectl describe service mainui-svc

Name:              mainui-svc
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          app=mainui
Type:              ClusterIP
IP Family Policy:  SingleStack
IP Families:       IPv4
IP:                10.98.12.13
IPs:               10.98.12.13
Port:              <unset>  80/TCP
TargetPort:        80/TCP
Endpoints:         192.168.11.82:80,192.168.11.83:80,192.168.221.17:80  #canary version 추가 
Session Affinity:  None
Events:            <none>

 

• Canary version pod 증가

kubectl scale deployment mainui-canary --replicas=2

 

• pod 삭제

kubectl delete deployments.apps mainui-canary
kubectl delete deployments.apps mainui-stable

<이미지 참고 : https://www.youtube.com/watch?v=u588KXtBoKU&list=PLApuRlvrZKohaBHvXAOhUD-RxD0uQ3z0c&index=33>

참고 : https://www.youtube.com/watch?v=u588KXtBoKU&list=PLApuRlvrZKohaBHvXAOhUD-RxD0uQ3z0c&index=33