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-v1
replicas: 1
template:
metadata:
labels:
app: nginx-v1
spec:
containers:
- name: nginx
image: nginx:1.14.0
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
---
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
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-v2
replicas: 1
template:
metadata:
labels:
app: nginx-v2
spec:
containers:
- name: nginx
image: nginx:1.20.0
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
---
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
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
三、方案：使用k8s 配置 RollingUpdate 滚动更新实现应用的灰度发布
spec:
replicas: 1 #运行容器的副本数，修改这里可以快速修改分布式节点数量
progressDeadlineSeconds: 600 #在Deployment 在进度卡住6分钟后报告
minReadySeconds: 120 #Pod被认为是可用状态的最小秒数，然后加入nacos 可用。默认是0
strategy:
rollingUpdate:
maxSurge: 1 #升级过程中激增Pod的最大数量
maxUnavailable: 0 #升级过程中不可用Pod的最大数量
type: RollingUpdate
apiVersion: v1
kind: Service
metadata:
name: $IMG_NAME
namespace: rz-dt
labels:
app: $IMG_NAME
spec:
type: NodePort
ports:
- port: 8091
nodePort: 31082 #service对外开放端口
selector:
app: $IMG_NAME
---
apiVersion: apps/v1
kind: Deployment #对象类型
metadata:
name: $IMG_NAME #名称
namespace: rz-dt
labels:
app: $IMG_NAME #标注
spec:
replicas: 1 #运行容器的副本数，修改这里可以快速修改分布式节点数量
progressDeadlineSeconds: 600 #在Deployment 在进度卡住6分钟后报告
minReadySeconds: 120 #Pod被认为是可用状态的最小秒数，然后加入nacos 可用。默认是0
strategy:
rollingUpdate:
maxSurge: 1 #升级过程中激增Pod的最大数量
maxUnavailable: 0 #升级过程中不可用Pod的最大数量
type: RollingUpdate
selector:
matchLabels:
app: $IMG_NAME
template:
metadata:
labels:
app: $IMG_NAME
spec:
containers: #docker容器的配置
- name: $IMG_NAME
env:
- name: aliyun_logs_catalina
value: stdout
image: rz-dt-image-server-registry-vpc.cn-shanghai.cr.aliyuncs.com/rz-dt/$IMG_NAME:$IMG_TAG # pull镜像的地址 ip:prot/dir/images:tag
imagePullPolicy: Always #pull镜像时机，
#command: ["java","-Dserver.port=8055","-jar","/usr/local/cenobitor/k8s-springboot-demo.jar"]
ports:
- containerPort: 8091 #容器对外开放端口,需与springboot配置文件一致
volumeMounts:
- name: time-config
mountPath: /etc/localtime
readOnly: true
- name: volume-logs
mountPath: /logs
subPath: logs
resources:
limits:
cpu: 500m
memory: 1Gi
requests:
cpu: 10m
memory: 50Mi
#从私有仓库拉取镜像凭证
imagePullSecrets:
- name: rz-dt-miyue-vpc
volumes:
- name: time-config
hostPath:
path: /usr/share/zoneinfo/Asia/Shanghai
- name: volume-logs
persistentVolumeClaim:
claimName: rz-dt-nas-volume-claim