云原生中间件-负载均衡之Ingress(ingress-nginx)

1 配置前提

2 确认信息

2.1 ingress-nginx组件检查pod

kubectl  get pod -A | grep ingress-nginx

2.2 ingress-nginx组件检查deployment

kubectl  get deployment -A | grep ingress-nginx

2.3 ingress-nginx组件检查service

kubectl  get svc -A | grep ingress-nginx  

2.4 ingress-nginx组件检查serviceaccount

kubectl  get serviceaccount -A | grep ingress-nginx

2.5 ingress-nginx组件检查clusterrole

kubectl  get clusterrole -A | grep ingress-nginx

3 demo用例

3.1 创建nginx-demo.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
  namespace: default
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: registry.cn-hangzhou.aliyuncs.com/acs-sample/nginx:latest
        ports:
        - containerPort: 80
---
kind: Service
apiVersion: v1
metadata:
  name: nginx
spec:
  selector:
    app: nginx
  ports:
    - port: 80
      targetPort: 80

kubectl apply -f nginx-demo.yaml

3.2 创建对外ingress(nginx-ingress-demo.yaml)

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    ingress.kubernetes.io/proxy-body-size: "0"
    ingress.kubernetes.io/ssl-redirect: "true"
    kubernetes.io/ingress.class: nginx-ingress-controller
    nginx.ingress.kubernetes.io/proxy-body-size: "0"
    nginx.ingress.kubernetes.io/ssl-redirect: "true"
  generation: 1
  name: nginx-demo
  namespace: default
spec:
  rules:
  - host: demo.adp.aliyunpoc.com
    http:
      paths:
      - backend:
          serviceName: nginx
          servicePort: 80
        path: /
status:
  loadBalancer:
    ingress:
    - {}

kubectl apply -f nginx-ingress-demo.yaml

3.3 检查校验

kubectl  get ingress -A

说明: 配置hosts映射关系进行访问，配置需要访问所在主机的hosts文件

网络可达的EIP test.myk8s.aliyunpoc.com

4 自定义ingress

4.1 确认发布服务

kubectl  get svc -A  | grep gra

说明： 查看备注命名空间，服务名和端口信息

4.2 配置ingress

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    ingress.kubernetes.io/proxy-body-size: "0"
    ingress.kubernetes.io/ssl-redirect: "true"
    kubernetes.io/ingress.class: nginx-ingress-controller
    nginx.ingress.kubernetes.io/proxy-body-size: "0"
    nginx.ingress.kubernetes.io/ssl-redirect: "true"
  generation: 1
  name: ingress的名称（标记作用）
  namespace: 服务所在的命名空间
spec:
  rules:
  - host: demo.adp.aliyunpoc.com（自定义域名）
    http:
      paths:
      - backend:
          serviceName: 需要暴露的服务名
          servicePort: 服务的内部端口
        path: /
status:
  loadBalancer:
    ingress:
    - {}

kubectl apply -f ingress的文件名

备注： 通过浏览器访问时同理，配置访问主机的hosts文件浏览器打开域名即可访问到服务页面。