使用 Kubeadm 部署 Kubernetes(K8S) 安装 IngressNgnix

前置条件：使用 Kubeadm 部署 Kubernetes(K8S) 安装

安装ingress-nginx组件（在master节点执行）

• 通过 ip+port 号进行访问，使用 Service 里的 NodePort 实现，把端口对外暴露
  缺陷：一个端口只能使用一次，一个端口对应一个应用，实际使用中都是用域名，根据不同的域名跳转到不同的端口服务中
• Ingress 作为统一入口，不同的域名 关联 Service ，由 Service 关联一组 Pod 实现负载均衡
  

创建 nginx 应用

# 创建 nginx 应用，对外暴露端口使用 NodePort
[root@k8smaster ~]# kubectl create deployment nginx --image=nginx
# 对外暴露 80 端口
[root@k8smaster ~]# kubectl expose deployment nginx --port=80 --type=NodePort
NAME                            READY   STATUS    RESTARTS   AGE
pod/javademo1-d7856c75c-czv2g   1/1     Running   0          152m
pod/javademo1-d7856c75c-n28rs   1/1     Running   0          151m
pod/javademo1-d7856c75c-xzqjc   1/1     Running   0          151m
pod/nginx-f89759699-5hkdw       1/1     Running   0          26d

NAME                 TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
service/javademo1    NodePort    10.106.43.46   <none>        8111:31452/TCP   20d
service/kubernetes   ClusterIP   10.96.0.1      <none>        443/TCP          26d
service/nginx        NodePort    10.103.87.81   <none>        80:30339/TCP     26d

访问地址：http://NodeIP:Port

部署 Ingress Controller

https://github.com/kubernetes/ingress-nginx/blob/nginx-0.30.0/deploy/static/

hostNetwork:true 新版的没有这个属性，后面再看

[root@k8smaster ~]# kubectl apply -f ingress-nginx.yaml
namespace/ingress-nginx created
configmap/nginx-configuration created
configmap/tcp-services created
configmap/udp-services created
serviceaccount/nginx-ingress-serviceaccount created
clusterrole.rbac.authorization.k8s.io/nginx-ingress-clusterrole created
role.rbac.authorization.k8s.io/nginx-ingress-role created
rolebinding.rbac.authorization.k8s.io/nginx-ingress-role-nisa-binding created
clusterrolebinding.rbac.authorization.k8s.io/nginx-ingress-clusterrole-nisa-binding created
deployment.apps/nginx-ingress-controller created
limitrange/ingress-nginx created
service/ingress-nginx created
#查看 ingress-nginx 的状态（yaml 中 namespace: ingress-nginx）
[root@k8smaster ~]# kubectl get pods -n ingress-nginx
NAME                                        READY   STATUS    RESTARTS   AGE
nginx-ingress-controller-5cb8688798-gspq4   1/1     Running   0          64m
[root@k8smaster ~]# 

创建 Ingress 规则

ingress-demo.yaml

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: example-ingress
spec:
  rules:
  - host: example.ingressdemo.com
    http:
      paths:
      - path: /
        backend:
          serviceName: web
          servicePort: 80

[root@k8smaster ~]# cat ./ingress-demo.yaml 
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: example-ingress
spec:
  rules:
  - host: example.ingressdemo.com
    http:
      paths:
      - path: /
        backend:
          serviceName: web
          servicePort: 80
[root@k8smaster ~]# kubectl apply -f ingress-demo.yaml 
ingress.networking.k8s.io/example-ingress created
[root@k8smaster ~]# kubectl get pods -n ingress-nginx -o wide
NAME                                        READY   STATUS    RESTARTS   AGE   IP            NODE       NOMINATED NODE   READINESS GATES
nginx-ingress-controller-5cb8688798-gspq4   1/1     Running   0          18h   10.244.2.39   k8snode2   <none>           <none>

修改Host文件

C:\Windows\System32\drivers\etc hosts 文件

10.244.2.39   example.ingressdemo.com

ip地址，对应 kubectl get pods -n ingress-nginx -o wide 命令中的 IP