Kubernetes（k8s）的Service Ingress详细介绍

在 Kubernetes v1.0 版本， Service 是 “4层”（TCP/UDP over IP）概念。 在 Kubernetes v1.1 版本，新增了 Ingress API（beta 版），用来表示 “7层”（HTTP）服务 

资料信息 【可实现7层代理】
Ingress-Nginx github 地址：https://github.com/kubernetes/ingress-nginx

Ingress-Nginx 官方网站：https://kubernetes.github.io/ingress-nginx/

部署 Ingress-Nginx 

下载Ingress-Nginx 文件

wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.28.0/deploy/static/mandatory.yaml

运行配置文件

​​​​chmod -R 777 /var/lib/docker

给docker权限，不然会出现问题。

我遇见这个问题，链接，你们可以参考一下

kubectl get pod -n ingress-nginx 

下载ingress-nginx暴露端口配置文件

wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.28.0/deploy/static/provider/baremetal/service-nodeport.yaml

 kubectl apply -f service-nodeport.yaml 

Ingress HTTP 代理访问 

deployment、Service、Ingress Yaml 文件 

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-dm
spec:
  replicas: 2
  template:
    metadata:
      labels:
        name: nginx
    spec:
      containers:
        - name: nginx
          image: wangyanglinux/myapp:v1
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
spec:
  ports:
    - port: 80
      targetPort: 80
      protocol: TCP
  selector:
    name: nginx

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-test
spec:
  rules:
    - host: www.heian.com
      http:
        paths:
        - path: /
          backend:
            serviceName: nginx-svc
            servicePort: 80

实验

deployment1.yaml 

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: deployment1
spec:
  replicas: 2
  template:
    metadata:
      labels:
        name: nginx
    spec:
      containers:
        - name: nginx
          image: wangyanglinux/myapp:v1
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: svc-1
spec:
  ports:
    - port: 80
      targetPort: 80
      protocol: TCP
  selector:
    name: nginx

deployment2.yaml 

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: deployment2
spec:
  replicas: 2
  template:
    metadata:
      labels:
        name: nginx2
    spec:
      containers:
        - name: nginx2
          image: wangyanglinux/myapp:v1
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: svc-2
spec:
  ports:
    - port: 80
      targetPort: 80
      protocol: TCP
  selector:
    name: nginx2

ingress-nginx

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress1
spec:
  rules:
    - host: www.heian.com
      http:
        paths:
        - path: /
          backend:
            serviceName: svc-1
            servicePort: 80
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress2
spec:
  rules:
    - host: www2.heian.com
      http:
        paths:
        - path: /
          backend:
            serviceName: svc-2
            servicePort: 80

Ingress  HTTPS 代理访问 

创建证书，以及 cert 存储方式 

openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj 
"/CN=nginxsvc/O=nginxsvc"
kubectl create secret tls tls-secret --key tls.key --cert tls.crt

deployment、Service、Ingress Yaml 文件 

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-test
spec:
  tls:
    - hosts:
      - foo.bar.com
      secretName: tls-secret
  rules:
    - host: foo.bar.com
      http:
        paths:
        - path: /
          backend:
            serviceName: nginx-svc
            servicePort: 80

Nginx 进行 BasicAuth 

yum -y install httpd
htpasswd -c auth foo
kubectl create secret generic basic-auth --from-file=auth

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress-with-auth
  annotations:
    nginx.ingress.kubernetes.io/auth-type: basic
    nginx.ingress.kubernetes.io/auth-secret: basic-auth
    nginx.ingress.kubernetes.io/auth-realm: 'Authentication Required - foo'
spec:
  rules:
  - host: foo2.bar.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx-svc
          servicePort: 80

Nginx 进行重写 

名称	描述	值
nginx.ingress.kubernetes.io/rewritetarget	必须重定向流量的目标URI	串
nginx.ingress.kubernetes.io/sslredirect	指示位置部分是否仅可访问SSL（当Ingress包含证书时 默认为True）	布尔
nginx.ingress.kubernetes.io/forcessl-redirect	即使Ingress未启用TLS，也强制重定向到HTTPS	布尔
nginx.ingress.kubernetes.io/approot	定义Controller必须重定向的应用程序根，如果它在'/'上 下文中	串
nginx.ingress.kubernetes.io/useregex	指示Ingress上定义的路径是否使用正则表达式	布尔

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-test
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: http://foo.bar.com:31795/hostname.html
spec:
  rules:
  - host: foo10.bar.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx-svc
          servicePort: 80