k8s1.20.15 部署ingress-nginx 与测试

标签(空格分隔): kubernetes系列


一: ingress-nginx的介绍

1. ingress 介绍
Service是基于四层TCP和UDP协议转发的,而Ingress可以基于七层的HTTP和HTTPS协议转发,可以通过域名和路径
来访问服务

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

2. k8s 对外暴露方式
K8s集群对外暴露服务的方式目前只有三种:
Loadblancer;Nodeport;ingress
前两种熟悉起来比较快,而且使用起来也比较方便,在此就不进行介绍了。

3. ingress由两部分组成:

ingress controller:将新加入的Ingress转化成Nginx的配置文件并使之生效
ingress服务:将Nginx的配置抽象成一个Ingress对象,每添加一个新的服务只需写一个新的Ingress的yaml文件即可
其中ingress controller目前主要有两种:基于nginx服务的ingress controller和基于traefik的ingress controller。
而其中traefik的ingress controller,目前支持http和https协议。

二: ingress-nginx的安装

wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.47.0/deploy/static/provider/baremetal/deploy.yaml

#修改镜像
vi deploy.yaml
#将image的值改为如下值:
registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/ingress-nginx-controller:v0.46.0

# 检查安装的结果
kubectl get pod,svc -n ingress-nginx

# 最后别忘记把svc暴露的端口要放行

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三: ingress-nginx的测试

3.1 测试环境

应用如下yaml,准备好测试环境
vim ingress-test.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-server
spec:
  replicas: 2
  selector:
    matchLabels:
      app: hello-server
  template:
    metadata:
      labels:
        app: hello-server
    spec:
      containers:
      - name: hello-server
        image: registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/hello-server
        ports:
        - containerPort: 9000
---
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: 9000
kubecl apply -f ingress-test.yaml

kubectl get pod,svc

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3.2 域名访问

apiVersion: networking.k8s.io/v1
kind: Ingress  
metadata:
  name: ingress-host-bar
spec:
  ingressClassName: nginx
  rules:
  - host: "hello.flyfish.com"
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: hello-server
            port:
              number: 8000
  - host: "demo.flyfish.com"
    http:
      paths:
      - pathType: Prefix
        path: "/"  # 把请求会转给下面的服务,下面的服务一定要能处理这个路径,不能处理就是404
        backend:
          service:
            name: nginx-demo  ## java,比如使用路径重写,去掉前缀nginx
            port:
              number: 8000
kubectl apply -f ingress-web.yaml
kubectl get ing 

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3.3 路径从写

vim ingress-rewrite.yaml

------

apiVersion: networking.k8s.io/v1
kind: Ingress  
metadata:
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /$2
  name: ingress-host-bar
spec:
  ingressClassName: nginx
  rules:
  - host: "hello.flyfish.com"
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: hello-server
            port:
              number: 8000
  - host: "demo.flyfish.com"
    http:
      paths:
      - pathType: Prefix
        path: "/nginx(/|$)(.*)"  # 把请求会转给下面的服务,下面的服务一定要能处理这个路径,不能处理就是404
        backend:
          service:
            name: nginx-demo  ## java,比如使用路径重写,去掉前缀nginx
            port:
              number: 8000

-----

kubectl apply -f ingress-rewrite.yaml

curl http://demo.flyfish.com:32

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3.3 流量限制


vim ingress-nginx.yaml

-----

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-limit-rate
  annotations:
    nginx.ingress.kubernetes.io/limit-rps: "1"
spec:
  ingressClassName: nginx
  rules:
  - host: "limit.flyfish.com"
    http:
      paths:
      - pathType: Exact
        path: "/"
        backend:
          service:
            name: nginx-demo
            port:
              number: 8000

kubectl apply -f ingress-limit.yaml

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