k8s部署ingress-nginx的方法步骤
前言
k8s集群服务部署好之后,需要对外提域名访问,这时候就需要ingress-nginx了,今天来给大家分享一下
一、部署配置Ingress
1、获取配置文件
#文件已下载到本地 https://github.com/kubernetes/ingress-nginx/tree/nginx-0.20.0/deploy
2、准备镜像
unzip ingress-nginx-nginx-0.20.0.zip cd ingress-nginx-nginx-0.20.0/deploy/ vim mandatory.yaml #其他文件的集合 #编辑mandatory.yaml文件,将defaultbackend镜像地址改成阿里云的镜像地址(如下图) image: registry.cn-hangzhou.aliyuncs.com/allinpay/defaultbackend-amd64:v1.5
3、安装
kubectl apply -f mandatory.yaml
#稍等片刻,使用下列命令查询 kubectl get namespace kubectl get pods -n ingress-nginx
4、创建后端pod和service (pod-B、service-B)
vim deploy-demo.yaml apiVersion: v1 kind: Service metadata: name: myapp namespace: default spec: selector: app: myapp release: canary ports: - name: http targetPort: 80 port: 80 --- apiVersion: apps/v1 kind: Deployment metadata: name: myapp-deploy namespace: default spec: replicas: 3 selector: matchLabels: app: myapp release: canary template: metadata: labels: app: myapp release: canary spec: containers: - name: myapp image: ikubernetes/myapp:v2 ports: - name: http containerPort: 80 #应用配置 kubectl apply -f deploy-demo.yaml #查看 kubectl get pods
5、创建service-A
vim service-nodeport.yaml apiVersion: v1 kind: Service metadata: name: ingress-nginx namespace: ingress-nginx labels: app.kubernetes.io/name: ingress-nginx app.kubernetes.io/part-of: ingress-nginx spec: type: NodePort ports: - name: http port: 80 targetPort: 80 protocol: TCP nodePort: 30080 - name: https port: 443 targetPort: 443 protocol: TCP nodePort: 30443 selector: app.kubernetes.io/name: ingress-nginx app.kubernetes.io/part-of: ingress-nginx #应用配置 kubectl apply -f service-nodeport.yaml #查看 kubectl get svc -n ingress-nginx
在外部浏览器中中访问:ip:30080
此时报错的原因是因为没有生成ingress-controller关联到service-B的ingress规则;
6、定义ingress规则
定义ingress规则,此间规则会自动注入到ingress-controller(pod)的nginx.conf中;
ingress-controller是直接关联到service-B的,但是中间由ingress来生成各种规则;
vim ingress-myapp.yaml apiVersion: extensions/v1beta1 kind: Ingress metadata: name: ingress-myapp namespace: default annotations: kubernetes.io/ingress.class: "nginx" spec: rules: - host: myapp.magedu.com http: paths: - path: backend: serviceName: myapp servicePort: 80
此时ingress-controller的nginx.conf中会自动生成一个server段的配置,也就是一个nginx的虚拟主机的字段,还包括upstream配置等;
upstream自动代理到后端pod(pod-B),这些都是自动生成,所以就实现了自动生成配置,自动更改配置等;
只需要改此yaml文件即可;
#应用配置 kubectl apply -f ingress-myapp.yaml
在外部主机上配置好host文件
然后在浏览器中再访问,发现已经可以访问到后端pod了
二、使用https
1、创建k8s证书(要注意和后端的pod使用相同的namespace)
kubectl -n default create secret tls ingress-test --key /home/centos/cert/cash432.key --cert /home/centos/cert/cash432.crt
2、创建ingress规则
注意namespace的相同性,要不然证书无法生效
vim ingress-myapp-cash432.yaml apiVersion: extensions/v1beta1 kind: Ingress metadata: name: ingress-myapp namespace: default annotations: kubernetes.io/ingress.class: "nginx" kubernetes.io/secure-backends: "true" kubernetes.io/ssl-passthrough: "true" spec: tls: - hosts: - myapp.cash432.xyz secretName: ingress-test rules: - host: myapp.cash432.xyz http: paths: - path: backend: serviceName: myapp servicePort: 80 #应用配置 kubectl apply -f ingress-myapp-cash432.yaml
浏览器访问
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