조연섭의 IT 블로그 :: Kubernetes - canary deployment (카나리 배포)

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canary deployment (카나리 배포)

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파드를 배포(업데이트)하는 방법

배포 방법	설명
블루 그린 업데이트	블루 제품을 전부 제거 후 그린 제품을 업데이트 (서비스 중단 간격이 생김)
롤링 업데이트	서비스 중단없이 한 개씩 업데이트 하는 방법
카나리 배포	기존 버전을 유지한 채로 일부 버전만 신규 버전으로 올려서 신규 버전에 버그나 이상은 없는지 확인

시나리오

name=mainui version=stable 버전의 pod를 생성

root@master:~# cat > 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: nginx
        image: nginx:1.14
        ports:
          - containerPort: 80
root@master:~# kubectl create -f mainui-stable.yaml 
deployment.apps/mainui-stable created

name=mainui를 selector하는 service 생성

root@master:~# cat > mainui-service.yaml
apiVersion: v1
kind: Service
metadata:
  name: mainui-svc
spec:
  selector:
    app: mainui
  ports:
  - port: 80
    protocol: TCP
    targetPort: 8080
root@master:~# kubectl create -f mainui-service.yaml 
service/mainui-svc created
root@master:~# kubectl get svc -o wide
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE    SELECTOR
kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP   2d1h   <none>
mainui-svc   ClusterIP   10.108.214.91   <none>        80/TCP    6s     app=mainui
root@master:~# kubectl describe svc mainui-svc 
Name:              mainui-svc
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          app=mainui
Type:              ClusterIP
IP Family Policy:  SingleStack
IP Families:       IPv4
IP:                10.108.214.91
IPs:               10.108.214.91
Port:              <unset>  80/TCP
TargetPort:        8080/TCP
Endpoints:         10.36.0.1:8080,10.44.0.3:8080
Session Affinity:  None
Events:            <none>

name=mainui version=canary 버전의 pod를 생성

root@master:~# cat > 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: nginx
        image: nginx:1.14
        ports:
          - containerPort: 80
root@master:~# kubectl create -f mainui-canary.yaml 
deployment.apps/mainui-canary created

stable, canary 버전이 공존해 있으면서 배포된 것을 확인

root@master:~# kubectl get pods -o wide
NAME                             READY   STATUS    RESTARTS   AGE     IP          NODE                NOMINATED NODE   READINESS GATES
mainui-canary-58cbfd7f4-lv82l    1/1     Running   0          15s     10.36.0.2   node1.example.com   <none>           <none>
mainui-stable-59c9f65b7c-n2zss   1/1     Running   0          7m11s   10.36.0.1   node1.example.com   <none>           <none>
mainui-stable-59c9f65b7c-xz559   1/1     Running   0          7m10s   10.44.0.3   node2.example.com   <none>           <none>
root@master:~# kubectl get deployments.apps
NAME            READY   UP-TO-DATE   AVAILABLE   AGE
mainui-canary   1/1     1            1           78s
mainui-stable   2/2     2            2           8m14s
root@master:~# kubectl describe svc mainui-svc 
Name:              mainui-svc
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          app=mainui
Type:              ClusterIP
IP Family Policy:  SingleStack
IP Families:       IPv4
IP:                10.108.214.91
IPs:               10.108.214.91
Port:              <unset>  80/TCP
TargetPort:        8080/TCP
Endpoints:         10.36.0.1:8080,10.36.0.2:8080,10.44.0.3:8080
Session Affinity:  None
Events:            <none>

canary 버전의 pod 개수 조절하여 확인

root@master:~# kubectl scale deployment mainui-canary --replicas=2
deployment.apps/mainui-canary scaled
root@master:~# kubectl get pods -o wide
NAME                             READY   STATUS    RESTARTS   AGE     IP          NODE                NOMINATED NODE   READINESS GATES
mainui-canary-58cbfd7f4-jt2nw    1/1     Running   0          16s     10.44.0.4   node2.example.com   <none>           <none>
mainui-canary-58cbfd7f4-lv82l    1/1     Running   0          110s    10.36.0.2   node1.example.com   <none>           <none>
mainui-stable-59c9f65b7c-n2zss   1/1     Running   0          8m46s   10.36.0.1   node1.example.com   <none>           <none>
mainui-stable-59c9f65b7c-xz559   1/1     Running   0          8m45s   10.44.0.3   node2.example.com   <none>           <none>
root@master:~# kubectl get deployments.apps
NAME            READY   UP-TO-DATE   AVAILABLE   AGE
mainui-canary   2/2     2            2           96s
mainui-stable   2/2     2            2           8m32s-09
root@master:~# kubectl describe svc mainui-svc 
Name:              mainui-svc
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          app=mainui
Type:              ClusterIP
IP Family Policy:  SingleStack
IP Families:       IPv4
IP:                10.108.214.91
IPs:               10.108.214.91
Port:              <unset>  80/TCP
TargetPort:        8080/TCP
Endpoints:         10.36.0.1:8080,10.36.0.2:8080,10.44.0.3:8080 + 1 more...
Session Affinity:  None
Events:            <none>

canary 버전 제거하고 stable 버전만 유지

root@master:~# kubectl delete deployment mainui-canary
deployment.apps "mainui-canary" deleted
root@master:~# kubectl get pods -o wide
NAME                             READY   STATUS    RESTARTS   AGE     IP          NODE                NOMINATED NODE   READINESS GATES
mainui-stable-59c9f65b7c-n2zss   1/1     Running   0          9m47s   10.36.0.1   node1.example.com   <none>           <none>
mainui-stable-59c9f65b7c-xz559   1/1     Running   0          9m46s   10.44.0.3   node2.example.com   <none>           <none>
root@master:~# kubectl get deployments.apps
NAME            READY   UP-TO-DATE   AVAILABLE   AGE
mainui-stable   2/2     2            2           9m51s
root@master:~# kubectl describe svc mainui-svc 
Name:              mainui-svc
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          app=mainui
Type:              ClusterIP
IP Family Policy:  SingleStack
IP Families:       IPv4
IP:                10.108.214.91
IPs:               10.108.214.91
Port:              <unset>  80/TCP
TargetPort:        8080/TCP
Endpoints:         10.36.0.1:8080,10.44.0.3:8080
Session Affinity:  None
Events:            <none>

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canary deployment (카나리 배포)

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