k8s学习笔记之四：使用kubeadm配置Ingress

Ingress

1、在master上执行

wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.20.0/deploy/mandatory.yaml
wget  https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/provider/baremetal/service-nodeport.yaml      #对外提供服务，如果不需要可以不下载

2、下载替换defaultbackend-amd64和nginx-ingress-controller镜像地址，速度也会更快！

[root@master ingress-nginx]# sed -i 's#k8s.gcr.io/defaultbackend-amd64#registry.cn-qingdao.aliyuncs.com
/kubernetes_xingej/defaultbackend-amd64#g' mandatory.yaml
[root@master ingress-nginx]# sed -i 's#quay.io/kubernetes-ingress-controller/nginx-ingress-controller#
registry.cn-qingdao.aliyuncs.com/kubernetes_xingej/nginx-ingress-controller#g' mandatory.yaml

3、修改service-nodeport.yaml文件，添加NodePort端口，默认为随机端口

[root@master ingress-nginx]# cat service-nodeport.yaml
apiVersion: v1
kind: Service
metadata:
  name: ingress-nginx
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  type: NodePort
  ports:
    - name: http
      port: 80
      targetPort: 80
      protocol: TCP
      nodePort: 30080
    - name: https
      port: 443
      targetPort: 443
      protocol: TCP
      nodePort: 30443
  selector:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

4、执行service-nodeport.yaml和mandatory.yaml两个文件

[root@k8s-master ingress-nginx]# kubectl apply -f mandatory.yaml 
[root@k8s-master ingress-nginx]# kubectl apply -f service-nodeport.yaml 

5、打开浏览器验证，正常

6、创建后端服务，这里我们已nginx为服务为例，创建一个nginx和跟nginx对应的service，这里要注意metadata.name要

和后面创建的ingress中的serviceName一致，切记！

[root@master myself]# cat mypod.yaml 
apiVersion: v1
kind: Service
metadata:
  name: service-nginx
  namespace: default
spec:
  selector:
    app: mynginx
  ports:
  - name: http
    port: 80
    targetPort: 80

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mydepoy
  namespace: default
spec:
  replicas: 5
  selector:
    matchLabels:
      app: mynginx
  template:
    metadata:
      labels:
        app: mynginx
    spec:
      containers:
      - name: mycontainer
        image: lizhaoqwe/nginx:v1
        imagePullPolicy: IfNotPresent
        ports:
        - name: nginx 
          containerPort: 80

有了前端了，也有后端了，那么接下来就该创建ingress规则了

7、创建ingress规则

[root@master myself]# cat ingress-nginx.yaml 
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress-mynginx
  namespace: default
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  rules:
  - host: mynginx.fengzi.com
    http:
      paths:
      - path:
        backend:
          serviceName: service-nginx
          servicePort: 80

8、在本地电脑C:\Windows\System32\drivers\etc\hosts添加一条hosts记录（mynginx.fengzi.com   192.168.254.13）然后打开浏览器验证

 

 

9、我们可以去查看nginx的配置文件，去查看我们所创建的规则有没有注入到ingress中

#查看ingress-controller中的规则
[root@master myself]# kubectl get pods -n ingress-nginx                                                      
NAME                                       READY   STATUS    RESTARTS   AGE
default-http-backend-7fccc47f44-sgj6g      1/1     Running   0          140m
nginx-ingress-controller-d786fc9d4-4vb5z   1/1     Running   0          140m

[root@master myself]# kubectl exec -it nginx-ingress-controller-d786fc9d4-4vb5z -n ingress-nginx -- /bin/bash

www-data@nginx-ingress-controller-d786fc9d4-4vb5z:/etc/nginx$ cat nginx.conf

我们可以看到nginx配置文件中已经有了我们所定义的反代规则

ok，成功！！！