v1是1.14.0版本nginx ,实操时候升级到v2是1.20.0版本nginx，来测试灰度发布实现过程

一、方案：使用ingress实现应用的灰度发布

1、服务端：正常版本v1，灰度升级版本v2

2、客户端：带有请求头version=v2标识的请求访问版本v2，其他的请求访问版本v1

3、待版本v2稳定后，所有请求切换至版本v2，停止版本v1（删除原deployment,service,ingress）

二、操作步骤

1、创建版本v1的deployment、service、ingress

nginx服务版本v1的deployment和service

nginx-v1.yml

apiVersion: apps/v1
kind: Deployment
metadata:name: nginx-v1
spec:selector:matchLabels:app: nginx-v1replicas: 1template:metadata:labels:app: nginx-v1spec:containers:- name: nginximage: nginx:1.14.0ports:- containerPort: 80volumeMounts:- mountPath: /usr/share/nginx/htmlname: filevolumes:- name: filehostPath:path: /data/nginx-v1
---
apiVersion: v1
kind: Service
metadata:name: nginx-v1-svc  labels:app: nginx-v1   
spec:type: ClusterIP  selector:app: nginx-v1ports:- port: 80targetPort: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:name: nginx-v1
spec:ingressClassName: nginxrules:- host: test.nginx.comhttp:paths:- path: /pathType: Prefixbackend:service:name: nginx-v1-svc port:number: 80

验证：apifox 调用test.nginx.com，当前所有请求都正常访问版本v1，即1.14版本nginx

2、创建版本v2的deployment、service、ingress

nginx服务版本v2的deployment、service

nginx-v2.yml

apiVersion: apps/v1
kind: Deployment
metadata:name: nginx-v2
spec:selector:matchLabels:app: nginx-v2replicas: 1template:metadata:labels:app: nginx-v2spec:containers:- name: nginximage: nginx:1.20.0ports:- containerPort: 80volumeMounts:- mountPath: /usr/share/nginx/htmlname: filevolumes:- name: filehostPath:path: /data/nginx-v2
---
apiVersion: v1
kind: Service
metadata:name: nginx-v2-svc  labels:app: nginx-v2   
spec:type: ClusterIP  selector:app: nginx-v2ports:- port: 80targetPort: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:name: nginx-v2annotations:nginx.ingress.kubernetes.io/canary: "true"nginx.ingress.kubernetes.io/canary-by-header: "version"  #请求头key=versionnginx.ingress.kubernetes.io/canary-by-header-value: "v2"  #请求头value=v2
spec:ingressClassName: nginxrules:- host: test.nginx.comhttp:paths:- path: /pathType: Prefixbackend:service:name: nginx-v2-svc port:number: 80

nginx服务版本v2的ingress，匹配请求头version=2访问

验证：postman调用test.nginx.com，加了请求头version=v2的请求访问版本v2，即1.20版nginx，其他请求访问版本v1