6.Nginx Ingress Controller

安装 Ingress

下载 Nginx Ingress Controller 配置文件

wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml

修改配置文件

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-ingress-controller
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: ingress-nginx
      app.kubernetes.io/part-of: ingress-nginx
  template:
    metadata:
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
      annotations:
        prometheus.io/port: "10254"
        prometheus.io/scrape: "true"
    spec:
      serviceAccountName: nginx-ingress-serviceaccount
      # 增加 hostNetwork: true，意思是开启主机网络模式，暴露 Nginx 服务端口 80
      hostNetwork: true
      containers:
        - name: nginx-ingress-controller
          # 修改为国内镜像地址
          image: quay.azk8s.cn/kubernetes-ingress-controller/nginx-ingress-controller:0.25.1

• 通过命令 kubectl apply -f mandatory.yaml 部署
• 通过命令 kubectl get pods -n ingress-nginx -o wide 查看

部署 Ingress

创建一个名为 ingress.yml 的资源配置文件

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: nginx-web
  annotations:
    # 指定 Ingress Controller 的类型
    kubernetes.io/ingress.class: "nginx"
    # 指定我们的 rules 的 path 可以使用正则表达式
    nginx.ingress.kubernetes.io/use-regex: "true"
    # 连接超时时间，默认为 5s
    nginx.ingress.kubernetes.io/proxy-connect-timeout: "600"
    # 后端服务器回转数据超时时间，默认为 60s
    nginx.ingress.kubernetes.io/proxy-send-timeout: "600"
    # 后端服务器响应超时时间，默认为 60s
    nginx.ingress.kubernetes.io/proxy-read-timeout: "600"
    # 客户端上传文件，最大大小，默认为 20m
    nginx.ingress.kubernetes.io/proxy-body-size: "10m"
    # URL 重写
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  # 路由规则
  rules:
  # 主机名，只能是域名，修改为你自己的
  - host: k8s.hzlim.cn
    http:
      paths:
      - path:
        backend:
          # 后台部署的 Service Name
          serviceName: tomcat-http
          # 后台部署的 Service Port
          servicePort: 8080

• 通过命令 kubectl apply -f ingress.yml 部署
• 通过命令 kubectl get ingress 查看

部署 Tomcat

部署 Tomcat 但仅允许在内网访问，我们要通过 Ingress 提供的反向代理功能路由到 Tomcat 之上，创建一个名为 tomcat.yml 资源配置文件

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: tomcat-app
spec:
  replicas: 2
  template:
    metadata:
      labels:
        name: tomcat
    spec:
      containers:
      - name: tomcat
        image: tomcat:8.5.43
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8080
---
apiVersion: v1
kind: Service
metadata:
  name: tomcat-http
spec:
  ports:
    - port: 8080
      targetPort: 8080
  # ClusterIP, NodePort, LoadBalancer
  type: ClusterIP
  selector:
    name: tomcat

• 通过命令 kubectl apply -f tomcat.yml 部署

验证是否成功

查看 Tomcat

kubectl get deployment

# 输出如下
NAME         READY   UP-TO-DATE   AVAILABLE   AGE
tomcat-app   2/2     2            2           58m

kubectl get service

# 输出如下
NAME          TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
kubernetes    ClusterIP   10.96.0.1        <none>        443/TCP    6h38m
tomcat-http   ClusterIP   10.104.100.199   <none>        8080/TCP   58m

查看 Ingress

kubectl get pods -n ingress-nginx -o wide

# 输出如下
NAME                                        READY   STATUS    RESTARTS   AGE   IP              NODE                 NOMINATED NODE   READINESS GATES
nginx-ingress-controller-74cc64b456-fkdmb   1/1     Running   0          11m   192.168.1.211   kubernetes-node-01   <none>           <none>

kubectl get ingress

# 输出如下
NAME        HOSTS          ADDRESS   PORTS   AGE
nginx-web   k8s.hzlim.cn             80      57m

测试访问

成功代理到 Tomcat 即表示成功

# 不设置 Hosts 的方式请求地址，下面的 IP 和 HOST 均在上面有配置
curl -v http://192.168.1.211 -H 'host: k8s.hzlim.cn'