关于k8s:K8S实战十二-为-Ingress-以及后端-Nginx-增加证书

前言

后面 nginx 都是 http 协定在工作，那么加证书应该如何操作。

更新历史

• 20200701 – 初稿 – 左程立
• 原文地址 – https://blog.zuolinux.com/2020/07/01/nginx-https.html

创立证书

能够网上申请一年收费证书，也能够自建证书。上面自建证书。

下载自建证书脚本

wget -O Makefile https://raw.githubusercontent.com/kubernetes/examples/master/staging/https-nginx/Makefile

创立证书文件

make keys KEY=/tmp/nginx.key CERT=/tmp/nginx.crt

将证书写入到 K8S 的 secret 中

# kubectl create secret tls nginxsecret --key /tmp/nginx.key --cert /tmp/nginx.crt
secret/nginxsecret created

将 nginx 配置写入到 K8S 的 configmap 中

# cat default.conf

server {
        listen 80 default_server;
        listen [::]:80 default_server ipv6only=on;

        listen 443 ssl;

        root /usr/share/nginx/html;
        index index.html;

        server_name localhost;
        ssl_certificate /etc/nginx/ssl/tls.crt;
        ssl_certificate_key /etc/nginx/ssl/tls.key;

        location / {try_files $uri $uri/ =404;}
}

# kubectl create configmap nginxconfigmap --from-file=default.conf
configmap/nginxconfigmap created

整合后端 Pod 和证书，应用 Service 公布

[root@master01 ~]# cat nginx-app.yaml 
apiVersion: v1
kind: Service
metadata:
  name: my-nginx
  labels:
    run: my-nginx
spec:
  type: NodePort
  ports:
  - port: 8080
    targetPort: 80
    protocol: TCP
    name: http
  - port: 443
    protocol: TCP
    name: https
  selector:
    run: my-nginx
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-nginx
spec:
  selector:
    matchLabels:
      run: my-nginx
  replicas: 1
  template:
    metadata:
      labels:
        run: my-nginx
    spec:
      volumes:
      - name: secret-volume
        secret:
          secretName: nginxsecret
      - name: configmap-volume
        configMap:
          name: nginxconfigmap
      containers:
      - name: nginxhttps
        image: bprashanth/nginxhttps:1.0
        ports:
        - containerPort: 443
        - containerPort: 80
        volumeMounts:
        - mountPath: /etc/nginx/ssl
          name: secret-volume
        - mountPath: /etc/nginx/conf.d
          name: configmap-volume

[root@master01 ~]# kubectl apply -f nginx-app.yaml       
service/my-nginx created
deployment.apps/my-nginx created

查看运行状况

[root@master01 ~]# kubectl get service -o wide
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                        AGE     SELECTOR
my-nginx     NodePort    192.20.27.173   <none>        8080:32529/TCP,443:32699/TCP   22s     run=my-nginx

[root@master01 ~]# kubectl get pod -o wide       
NAME                          READY   STATUS    RESTARTS   AGE     IP               NODE     NOMINATED NODE   READINESS GATES
my-nginx-85fccfd5dc-2pzvw     1/1     Running   0          64s     192.10.205.224   work01   <none>           <none>

尝试拜访

[root@master01 ~]# curl -k https://192.20.27.173  

<title>Welcome to nginx!</title>

Service 应用 NodePort 进行了端口裸露，所以能够在浏览器中拜访 https:// 任意节点 IP:32699，也能够看到证书曾经失效。

因为是自建证书，须要手动疏忽报错。

整合 ingress 和证书

# cat ingress.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: secret-tls-ingress
  annotations:
    ingress.kubernetes.io/ssl-redirect: "False"
spec:
  tls:
  - hosts:
    - test.com
    secretName: nginxsecret
  rules:
  - host: test.com
    http:
      paths:
      - backend:
          serviceName: my-nginx
          servicePort: 80
        path: /

# kubectl apply -f ingress.yaml  
ingress.extensions/secret-tls-ingress created

在后面章节中曾经将 ingress-controller 绑定在了 work01/02 上，所以在集群外绑定 test.com 到 work01 IP 进行测试。

# curl -k https://test.com
<title>Welcome to nginx!</title>

能够胜利拜访。

结束语

证书这块次要是把证书文件存入 K8S 的 secret 对象中，而后进行挂载映射。

这样能够实现证书文件和 ingress 的解耦。

能够只在 ingress 中设置证书，后端 nginx 不配置证书。

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