Kubernetes中的Ingress（五）

一、Ingress介紹和安裝

1，介紹

　　Ingress 是對集羣中服務的外部訪問進行管理的 API 對象，典型的訪問方式是 HTTP。Ingress 可以提供負載均衡、SSL 終結和基於名稱的虛擬託管。可理解爲Ingress 是在 k8s 集羣中的 Service 上做了一個 nginx 代理，將所有匹配到的請求轉發到對應的 Service 中。

2，安裝Ingress-nginx

　　參考:https://github.com/kubernetes/ingress-nginx/blob/nginx-0.30.0/docs/deploy/index.md

# 下載 mandatory.yaml 。--no-check-certificate：避免“無法建立 SSL 連接”錯誤
wget --no-check-certificate https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.30.0/deploy/static/mandatory.yaml
# 查看需要的鏡像
cat mandatory.yaml | grep image
# 在每個集羣節點中拉取 docker 鏡像 自行解決
# 創建 Pod
kubectl apply -f mandatory.yaml
# 查看 Pod。注意 命令空間是：ingress-nginx
kubectl get pod -n ingress-nginx
# 下載 service-nodeport.yaml
wget --no-check-certificate https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.30.0/deploy/static/provider/baremetal/service-nodeport.yaml
# 創建 svc
kubectl apply -f service-nodeport.yaml
kubectl get svc -n ingress-nginx

　　注意：如果出現權限問題。參考文章

二、示例

1，HTTP代理訪問

　　a)創建ingress-http.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx-app
    spec:
      containers:
      - name: nginx-container
        image: hub.xcc.com/my-xcc/my-nginx:v1
        imagePullPolicy: IfNotPresent
        ports:
          - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
spec:
  selector:
    app: nginx-app
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-ing
spec:
  rules:
  - host: foo.xcc.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx-svc
          servicePort: 80

　　b)執行命令

kubectl apply -f ingress-http.yaml
kubectl get deployment
kubectl get svc
kubectl get pod
kubectl get ing

　　c)訪問

#查看ingress-nginx暴露的端口 通過該域名foo.xcc.com:端口
[root@master01 ingress]# kubectl get svc -n ingress-nginx
NAME            TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx   NodePort   10.116.16.25   <none>        80:30554/TCP,443:30935/TCP   36m

2，HTTPS代理訪問

　　a)創建證書

# 生成證書文件
openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=nginxsvc /O=nginxsvc"
#查看文件
ls
#創建secret
kubectl create secret tls tls-secret --key tls.key --cert tls.crt
#查看secret
kubectl get secret

　　b)創建nginx-https-ing.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-https-ing
spec:
  tls:
  - hosts: 
    - foo.bar.com
    secretName: tls-secret
  rules:
  - host: foo.xcc.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx-svc
          servicePort: 80

　　c)執行命令創建

kubectl apply -f nginx-https-ing.yaml

　　d)訪問

#可通過域名https:// foo.xcc.com:端口。查看端口
[root@master01 ingress]# kubectl get svc -n ingress-nginx
NAME            TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx   NodePort   10.116.16.25   <none>        80:30554/TCP,443:30935/TCP   36m

3，BasicAuth認證

　　採用訪問某一域名是進行賬號密碼認證

　　a)創建證書

# 安裝 httpd
yum -y install httpd
# 創建認證賬戶foo 並設置密碼
htpasswd -c auth foo
# 創建secret
kubectl create secret generic basic-auth --from-file=auth
# 查看證書
kubectl get secret

　　b)創建auth-ing.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: auth-ing
  annotations:
    nginx.ingress.kubernetes.io/auth-type: basic
    nginx.ingress.kubernetes.io/auth-secret: basic-auth
    nginx.ingress.kubernetes.io/auth-realm: 'Authenticasion Required - foo'
spec:
  rules:
  - host: auth.xcc.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx-svc
          servicePort: 80

　　c)執行命令

kubectl apply -f auth-ing.yaml
#查看ingress
 kubectl get ing

　　d)訪問

　　訪問auth.xcc.com:端口，此時需要輸入用戶名和密碼(前面設置的)

#查看端口
[root@master01 ingress]# kubectl get svc -n ingress-nginx
NAME            TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx   NodePort   10.116.16.25   <none>        80:30554/TCP,443:30935/TCP   36m

三、查看Ingress-Nginx的代理配置

# 查看 ingress-controller pod
[root@k8s-master01 ingress]# kubectl get pod -n ingress-nginx
NAME                                        READY   STATUS    RESTARTS   AGE
nginx-ingress-controller-ab5didia2-eds1d   1/1     Running   0          59m

# 進入到 pod 中
[root@k8s-master01 ingress]# kubectl exec nginx-ingress-controller-ab5didia2-eds1d -n ingress-nginx -it /bin/bash

# 在容器內 查看裏面的 /etc/nginx/nginx.conf 文件
cat /etc/nginx/nginx.conf