上海松江区建设局官方网站,百度推广开户公司,黄骅市中医院,装饰网站建设软件下载K8S中ingress-nginx通过header路由到不同后端
背景
公司使用ingress-nginx作为网关的项目#xff0c;需要在相同域名、uri#xff0c;根据header将请求转发到不同的后端中在稳定发布的情况下#xff0c;ingress-nginx是没有语法直接支持根据header做转发的。但是这个可以利…K8S中ingress-nginx通过header路由到不同后端
背景
公司使用ingress-nginx作为网关的项目需要在相同域名、uri根据header将请求转发到不同的后端中在稳定发布的情况下ingress-nginx是没有语法直接支持根据header做转发的。但是这个可以利用灰度发布的特性实现header路由功能
准备
准备两个后端后端代码如下路由均为 /app main.go
package mainimport github.com/gin-gonic/ginfunc main() {r : gin.Default()r.GET(/app, func(context *gin.Context) {context.JSON(200, gin.H{message: app1})})r.Run(:8080)
}使用Dockerfile构建镜像 这里构建 goapp1:v1goapp2:v1两个镜像goapp2请将main.go修改 “message”: “app2”
FROM golang:1.17.13
RUN mkdir -p /go/app/; \cd /go/app/; \go mod init app1;\GOPROXYhttps://goproxy.cn,direct go get github.com/gin-gonic/ginv1.6.3
WORKDIR /go/app/
COPY main.go /go/app
EXPOSE 8080
CMD go run main.go使用灰度发布的特性进行header的路由
此解决方案参考https://v2-1.docs.kubesphere.io/docs/zh-CN/quick-start/ingress-canary/注本人使用低版本ingress-nginx高版本的请大家自行修改不同之处首先部署goapp1:v1 和 goapp2:v1 的deployment和service 此为goapp1。goapp2请自行修改
apiVersion: apps/v1
kind: Deployment
metadata:name: goapp1namespace: default
spec:replicas: 1selector:matchLabels:app: goapp1template:metadata:labels:app: goapp1spec:containers:- image: goapp1:v1imagePullPolicy: IfNotPresentname: goapp1ports:- containerPort: 80protocol: TCP
---
apiVersion: v1
kind: Service
metadata:name: goapp1namespace: default
spec:ports:- port: 8080protocol: TCPtargetPort: 8080selector:app: goapp1部署稳定发布版本的ingress路由至goapp1
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:name: goapp1 namespace: defaultannotations:kubernetes.io/ingress.class: nginx
spec:rules:- host: test.comhttp:paths:- path: /app pathType: Prefixbackend:service:name: goapp1port: number: 8080
部署canary版本的ingress路由至goapp2 这里可见 域名都是 test.comuri都是 /app注解 nginx.ingress.kubernetes.io/canary: “true” # 启用canary灰度发布特性nginx.ingress.kubernetes.io/canary-by-header: canary # 通过header可选择是否转发至canary版本的后端
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:name: goapp2namespace: defaultannotations:kubernetes.io/ingress.class: nginxnginx.ingress.kubernetes.io/canary: truenginx.ingress.kubernetes.io/canary-by-header: canary
spec:rules:- host: test.comhttp:paths:- path: /app pathType: Prefixbackend:service:name: goapp2port: number: 8080进行测试
for i in {1..20};# ingress-nginx的NodePort请自行查看替换下面的端口do curl test.com:31132/app -H canary: never; # 路由至稳定版本的goapp1echo -e ;
donefor i in {1..20};do curl test.com:31132/app -H canary: always; # 路由至canary版本的goapp2echo -e ;
done效果如下可以看到可以通过header控制发送请求到不同后端能够满足需求
通过nginx进行转发
第二种方法可通过在k8s集群部署一个nginx 通过nginx进行分流 流量路径如下 ingress-nginx -- nginx -- goapp1或goapp2 这里nginx写法有比较多我选择最简单的通过if判断$http_my_header在使用$http_my_header之前需要对ingress-nginx和nginx添加参数允许header中存在下划线 ingress-nginx
kubectl edit cm ingress-nginx-controller
------------------
apiVersion: v1
data:allow-snippet-annotations: true# 添加下面这两个参数enable-underscores-in-headers: trueignore-invalid-headers: false
kind: ConfigMap部署nginxnginx中开启允许header下划线的参数underscores_in_headers on;
apiVersion: apps/v1
kind: Deployment
metadata:name: nginxnamespace: default
spec:replicas: 1selector:matchLabels:app: nginxtemplate:metadata:labels:app: nginxspec:containers:- name: nginximage: nginx:1.24.0ports:- containerPort: 80volumeMounts:- name: nginxmountPath: /etc/nginx/nginx.confsubPath: nginx.confvolumes:- name: nginxconfigMap:name: nginxitems:- key: nginx.confpath: nginx.conf
---
apiVersion: v1
kind: Service
metadata:name: nginxnamespace: default
spec:selector:app: nginxports:- protocol: TCPport: 80targetPort: 80
---
apiVersion: v1
data:nginx.conf: |user nginx;worker_processes auto;error_log /var/log/nginx/error.log notice;pid /var/run/nginx.pid;events {worker_connections 1024;}http {upstream upstream_server1 {server goapp1:8080;}upstream upstream_server2 {server goapp2:8080;}include /etc/nginx/mime.types;default_type application/octet-stream;log_format main $remote_addr - $remote_user [$time_local] $request $status $body_bytes_sent $http_referer $http_user_agent $http_x_forwarded_for $http_my_header;access_log /var/log/nginx/access.log main;sendfile on;keepalive_timeout 65;server {underscores_in_headers on; listen 80;server_name test.com;location /app {if ($http_my_header value1) {proxy_pass http://upstream_server1;}if ($http_my_header value2) {proxy_pass http://upstream_server2;}}}}kind: ConfigMap
metadata:name: nginxnamespace: default上面的配置判断 $http_my_header是 value1 还是 value2再转发到不同的upstream测试
curl test.com/app -H my_header:value1
curl test.com/app -H my_header:value2
