KubernetesNotes10:Ingress域名访问

1. 配置文件 1.1 测试环境 2. 运行 2.1 生成Pod 2.1 查看Service服务 3. 按域名访问 3.1 Ingress规则配置文件 3.2 运行规则 3.3 使用域名访问 3.5 修改规则 3.6 路径重写 4. 修改window本地hosts文件修改域名指向

1. 配置文件

1.1 测试环境

应用如下yaml，准备好测试环境

创建文件ingress_domain.yaml


apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: hello-server
  name: hello-server
spec:
  replicas: 2
  selector:
    matchLabels:
      app: hello-server
  template:
    metadata:
      labels:
        app: hello-server
    spec:
      containers:
      - name: hello-server
        image: tomcat
        ports:
        - containerPort: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nginx-demo
  name: nginx-demo
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx-demo
  template:
    metadata:
      labels:
        app: nginx-demo
    spec:
      containers:
      - image: nginx
        name: nginx
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: nginx-demo
  name: nginx-demo
spec:
  selector:
    app: nginx-demo
  ports:
  - port: 8000
    protocol: TCP
    targetPort: 80
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: hello-server
  name: hello-server
spec:
  selector:
    app: hello-server
  ports:
  - port: 8000
    protocol: TCP
    targetPort: 8080

2. 运行

2.1 生成Pod


# 运行yaml文件
kubectl apply -f ingress_domain.yaml

2.1 查看Service服务


root@docker01:/home# kubectl get svc


# 1. 查看tomcat镜像生成的hello-server
root@docker01:/home# curl 10.96.196.37:8000
<!doctype html><html lang="en"><head><title>HTTP Status 404 – Not Found</title><style type="text/css">body {font-family:Tahoma,Arial,sans-serif;} h1, h2, h3, b {color:white;background-color:#525D76;} h1 {font-size:22px;} h2 {font-size:16px;} h3 {font-size:14px;} p {font-size:12px;} a {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP Status 404 – Not Found</h1><hr class="line" /><p><b>Type</b> Status Report</p><p><b>Description</b> The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.</p><hr class="line" /><h3>Apache Tomcat/10.0.13</h3></body></html>root@docker01:/home# 
# 查看nginx生成的nginx-demo
root@docker01:/home# curl 10.96.116.66:8000
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>
root@docker01:/home#

3. 按域名访问

3.1 Ingress规则配置文件

创建ingress-rule.yaml


apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-host-bar
spec:
  ingressClassName: nginx
  rules: 
  - host: "hello.henggao.com"
    http: 
      paths: 
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: hello-server
            port:
              number: 8000
  - host: "demo.henggao.com"
    http: 
      paths: 
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: nginx-demo
            port:
              number: 8000

3.2 运行规则


# 1. 创建ingress规则
root@docker01:/home# kubectl apply -f ingress-rule.yaml 
ingress.networking.k8s.io/ingress-host-bar created
# 2. 查看ingress规则
root@docker01:/home# kubectl get ingress
NAME               CLASS   HOSTS                                ADDRESS          PORTS   AGE
ingress-host-bar   nginx   hello.henggao.com,demo.henggao.com   192.168.92.140   80      30s
root@docker01:/home#

3.3 使用域名访问

这里模拟域名，需要修改windows域名和端口映射，参考下面内容4

查看到端口号


root@docker01:/home# kubectl get svc -A

浏览器访问


http://demo.henggao.com:30763/
http://hello.henggao.com:30763/

3.5 修改规则


kubectl edit ing ingress-host-bar

修改路径

访问：http://hello.henggao.com:30763

访问：http://hello.henggao.com:30763/nginx ，才可以成功访问到

Ingress本身就是一个Nginx服务，Ingress网关层

未来部署服务比如后台请求api路径，需要路径重写，参照官方文档：

Annotations - NGINX Ingress Controller

You can add these Kubernetes annotations to specific Ingress objects to customize their behavior. Tip Annotation keys and values can only be strings. Other types, such as boolean or numeric values must be quoted, i.e. "true", "false", "100".

https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/#rewrite

3.6 路径重写

Rewrite - NGINX Ingress Controller

This example demonstrates how to use the Rewrite annotations You will need to make sure your Ingress targets exactly one Ingress controller by specifying the ingress.class annotation, and that you have an ingress controller running in your cluster.

https://kubernetes.github.io/ingress-nginx/examples/rewrite/

Ingress规则配置文件ingress-rule.yaml 添加两个地方即可


apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-host-bar
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /$2
spec:
  ingressClassName: nginx
  rules: 
  - host: "hello.henggao.com"
    http: 
      paths: 
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: hello-server
            port:
              number: 8000
  - host: "demo.henggao.com"
    http: 
      paths: 
      - pathType: Prefix
        path: "/nginx(/|$)(.*)"
        backend:
          service:
            name: nginx-demo
            port:
              number: 8000

修改文件，保存，运行配置文件


# 1. 修改文件
root@docker01:/home# vim ingress-rule.yaml
# 2. 运行配置文件
root@docker01:/home# kubectl apply -f ingress-rule.yaml 
ingress.networking.k8s.io/ingress-host-bar configured
root@docker01:/home#

访问浏览器：http://demo.henggao.com:30763/nginx

4. 修改window本地hosts文件修改域名指向

我这里模拟域名，修改windows域名和端口映射

文件目录： C:\Windows\System32\drivers\etc 的hosts文件


# C:\Windows\System32\drivers\etc\hosts
192.168.92.138 hello.henggao.com
192.168.92.138 demo.henggao.com