k8s ingress实现灰度发布

标签：ingress name v1 nginx v2 灰度 版本 k8s

一、方案：使用ingress实现应用的灰度发布

说明：此灰度发布方法不适用于利用网关转发服务的架构，利用网关转发的架构，需在网关实现灰度。

灰度流程：

1、服务端：版本v1正常运行，发布版本v2

2、客户端：带有请求头Headers标识key=version，value=v2的请求访问服务端版本v2，其他的请求访问服务端版本v1

3、待服务端版本v2稳定后，所有请求切换至服务端版本v2，停止服务端版本v1

二、操作步骤

1、创建nginx服务v1版本deployment和service

nginx-v1.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-v1
spec:
  selector:
    matchLabels:
      app: nginx-v1
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx-v1
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80
        volumeMounts:
        - mountPath: /usr/share/nginx/html
          name: file
      volumes:
      - name: file
        hostPath:
          path: /data/nginx-v1
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-v1-svc  
  labels:
    app: nginx-v1   
spec:
  type: ClusterIP  
  selector:
    app: nginx-v1
  ports:
  - port: 80
    targetPort: 80

kubectl apply -f nginx-v1.yml

2、创建nginx服务v1版本ingress

nginx-v1-ingress.yml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nginx-v1
spec:
  ingressClassName: nginx
  rules:
  - host: test.nginx.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: nginx-v1-svc 
            port:
              number: 80

kubectl apply -f nginx-v1-ingress.yml

3、postman调用test.nginx.com

返回信息v1，说明所有请求都正常访问v1版本

 

 4、创建nginx服务v2版本deployment和service

nginx-v2.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-v2
spec:
  selector:
    matchLabels:
      app: nginx-v2
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx-v2
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80
        volumeMounts:
        - mountPath: /usr/share/nginx/html
          name: file
      volumes:
      - name: file
        hostPath:
          path: /data/nginx-v2
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-v2-svc  
  labels:
    app: nginx-v2   
spec:
  type: ClusterIP  
  selector:
    app: nginx-v2
  ports:
  - port: 80
    targetPort: 80

kubectl apply -f nginx-v2.yml

5、创建nginx服务v2版本ingress，添加请求头version=2访问

nginx-v2-ingress.yml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nginx-v2
  annotations:
    nginx.ingress.kubernetes.io/canary: "true"
    nginx.ingress.kubernetes.io/canary-by-header: "version"  #请求头key=version
    nginx.ingress.kubernetes.io/canary-by-header-value: "v2"  #请求头value=v2
spec:
  ingressClassName: nginx
  rules:
  - host: test.nginx.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: nginx-v2-svc 
            port:
              number: 80

kubectl apply -f nginx-v2-ingress.yml

6、postman调用test.nginx.com

加了请求头version=v2的请求，返回信息v2，说明请求访问的是v2版本

 

 没加请求头version=v2的请求，返回v1，说明其他请求访问的还是v1版本

 

 7、切换版本，使所有请求都访问v2版本

编辑v1版本的ingress，name: nginx-v1-svc改为nginx: nginx-v2-svc

kubectl edit ingres nginx-v1

 

 8、验证：postman调用test.nginx.com，返回信息v2，说明所有请求访问的都是版本v2

没加请求头信息

 

加请求头信息：version=v2 

 

 

9、删除v1版本服务deployment，service，v2版本ingress

kubectl delete deploy nginx-v1
kubectl delete svc nginx-v1-svc
kubectl delete ingress nginx-v2

 

标签：ingress,name,v1,nginx,v2,灰度,版本,k8s
From： https://www.cnblogs.com/chenlin2022/p/16742604.html