Nginx ingress 使用ConfigMap来管理Nginx配置，nginx是大家熟知的代理和负载均衡软件，比起Traefik来说功能更加强大.

ngress是Kubernetes集群对外暴露服务的一种推荐方法，Ingress封装了nginx，背后还是nginx在发挥作用，Ingress的作用是不断检测pod的IP变化，然后将变化更新到nginx的配置中。从而当集群中有pod重启时，可以做到不用重启nginx

with Helm

#use helm  正常情况下如次  要FQ

helm upgrade --install ingress-nginx ingress-nginx \
  --repo https://kubernetes.github.io/ingress-nginx \
  --namespace ingress-nginx --create-namespace

Release "ingress-nginx" does not exist. Installing it now.

Error: failed to download "https://github.com/kubernetes/ingress-nginx/releases/download/helm-chart-4.1.4/ingress-nginx-4.1.4.tgz"

使用Helm3.6 安装 Ingress-nginx

install(现在用kuboard 2022)

部署Ingress 控制器

https://kubernetes.github.io/ingress-nginx/deploy/


#2022 ok
首先，需要匹配Ingress-nginx版本和kubernetes版本。 在https://github.com/kubernetes/ingress-nginx可以找到
Supported Versions table


1.直接下载我已替换镜像地址 https://github.com/evan886/k8s-install/blob/main/deploy-v1.3.1.yaml

2.官方 下载 
wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.3.1/deploy/static/provider/cloud/deploy.yaml

查看该文件用到了哪些镜像：
 cat  deploy.yaml | grep  image  
总之 registry.k8s.io 全换成https://dockerproxy.com  切记，不要替换少了 

https://dockerproxy.com/docs 真是好东西 感谢

添加内容 暴露controller  端口，不行可能 404 ，ln 496就是添加的内容 

494         kubernetes.io/os: linux
495       serviceAccountName: ingress-nginx
496       hostNetwork: true

optimize suggestion优化建议
deploy.yaml中默认 controller副本为1  可以改大replicas 提升性能

kubectl apply -f  deploy.yaml # or  deploy-v1.3.1.yaml

查看结果 ：
root@ubuntu-200470-1:~/ingress# kubectl get pods -n ingress-nginx -o wide
NAME                                        READY   STATUS      RESTARTS   AGE   IP               NODE    NOMINATED NODE   READINESS GATES
ingress-nginx-admission-create-dbgqr        0/1     Completed   0          83m   10.234.253.158   work2   <none>           <none>
ingress-nginx-admission-patch-mnsq9         0/1     Completed   3          83m   10.234.11.241    work1   <none>           <none>
ingress-nginx-controller-5dc549b98b-6nnsh   1/1     Running     0          83m   192.168.10.82    work1   <none>           <none>
root@ubuntu-200470-1:~/ingress# 

root@ubuntu-200470-1:~/ingress# curl 192.168.10.82
<html>
<head><title>404 Not Found</title></head>
<body>
<center><h1>404 Not Found</h1></center>
<hr><center>nginx</center>
</body>
</html
成功 


nuc k8s 
root@ubuntu-200430-1:~/ingress# kubectl get pods -n ingress-nginx -o wide
NAME                                        READY   STATUS      RESTARTS   AGE   IP               NODE    NOMINATED NODE   READINESS GATES
ingress-nginx-admission-create-c87dq        0/1     Completed   0          50s   10.234.10.73     work1   <none>           <none>
ingress-nginx-admission-patch-7jwbn         0/1     Completed   0          50s   10.234.228.242   work3   <none>           <none>
ingress-nginx-controller-5dc549b98b-927zt   0/1     Running     0          50s   192.168.10.34    work3   <none>           <none>

部署svc

 kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/cloud-generic.yaml
service/ingress-nginx created


[root@master ingress]# kubectl get svc -n ingress-nginx
NAME            TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx   LoadBalancer   10.99.141.156   <pending>     80:31279/TCP,443:30847/TCP   2m43s

usage

最简单的使用例子

run


##前提是已安装 ingress controller --  Ingress-Nginx
kubectl apply -f apple-deployment-and-service.yaml

kubectl apply -f banana-deployment-and-service.yaml
kubectl apply -f ingress.yaml

files

cat /root/apple-deployment-and-service.yaml 
kind: Deployment
apiVersion: apps/v1
metadata:
  name: apple
spec:
  selector:
    matchLabels:
      app: apple
  replicas: 2
  template:
    metadata:
      labels:
        app: apple
    spec:
      containers:
        - name: apple
          image: jxlwqq/http-echo
          args:
            - "--text=apple"
          ports:
            - containerPort: 8080

---

kind: Service
apiVersion: v1
metadata:
  name: apple-svc
spec:
  selector:
    app: apple
  ports:
    - port: 8080
      targetPort: 8080


cat /root/banana-deployment-and-service.yaml 
kind: Deployment
apiVersion: apps/v1
metadata:
  name: banana
spec:
  selector:
    matchLabels:
      app: banana
  replicas: 2
  template:
    metadata:
      labels:
        app: banana
    spec:
      containers:
        - name: banana
          image: jxlwqq/http-echo
          args:
            - "--text=banana"
          ports:
            - containerPort: 8080

---

kind: Service
apiVersion: v1
metadata:
  name: banana-svc
spec:
  selector:
    app: banana
  ports:
    - port: 8080
      targetPort: 8080

 cat /root/ingress.yml 
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: fruit-ing
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /

spec:
  rules:
    - host:  aa.com
      http:
        paths:
          - path: /apple
            pathType: Prefix
            backend:
              service:
                name: apple-svc
                port:
                  number: 8080
          - path: /banana
            pathType: Prefix
            backend:
              service:
                name: banana-svc
                port:
                  number: 8080
  ingressClassName: nginx

test

kubectl get pod -n ingress-nginx  -o wide 
NAME                                        READY   STATUS      RESTARTS   AGE   IP               NODE    NOMINATED NODE   READINESS GATES
ingress-nginx-admission-create-dbgqr        0/1     Completed   0          28m   10.234.253.158   work2   <none>           <none>
ingress-nginx-admission-patch-mnsq9         0/1     Completed   3          28m   10.234.11.241    work1   <none>           <none>
ingress-nginx-controller-5dc549b98b-6nnsh   1/1     Running     0          28m   192.168.10.82    work1   <none>           <none>

得知 ingress-nginx-controller 在节点2机器上ip  为192.168.10.82

 cat /etc/hosts  | grep  aa.com 
192.168.10.82 aa.com
➜  ~

简单的使用例子 old

** 创建一个空间


 cat  testing-namespace.yaml 
kind: Namespace
apiVersion: v1
metadata:
  name: testing
  labels:
    env: testing

** 创建 tomcat-deploy


cat  tomcat-deploy.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deploy
  namespace: testing
spec:
  replicas: 2
  selector:
    matchLabels:
      app: tomcat
  template:
    metadata:
      labels:
        app: tomcat
    spec:
      containers:
      - name: tomcat
        image: tomcat:8.0.50-jre8-alpine
        ports:
        - containerPort: 8080
          name: httpport
        - containerPort: 8009
          name: ajpport

** 创建 tomcat svc

          


 cat  tomcat-svc.yaml 
apiVersion: v1
kind: Service
metadata:
  name: tomcat-svc
  namespace: testing
  labels:
    app: tomcat-svc
spec:
  selector:
    app: tomcat
  ports:
  - name: httpport
    port: 80
    targetPort: 8080
    protocol: TCP

** 创建 tomcat-ingress


#前提 先在 kuboard 先创建个ingress 叫 tt

 cat tomcat-ingress.yaml 
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: tomcat
  namespace: testing
  annotations:
    kubernetes.io/ingress.class: "tt"
    #kubernetes.io/ingress.class: "nginx"
spec:
  rules:
  - host: tt.com
  #- host: tomcat.ikubernetes.io
    http:
      paths:
      - path: 
        backend:
          serviceName: tomcat-svc
          servicePort: 80