证书准备

• 自己制作
  这个不赘述了，网上一大把
• 购买的ssl证书
  这里使用的是购买的ssl证书

问题纠正

• 有些说法是traefik证书名字必须是tls（比如: tls.pem, tls.key)，这是错误的说法，下面就以非tls名字命名的证书来实现traefik ssl证书的添加
• traefik中ssl和config挂载路径问题
  在traefik-deployment.yaml中我们知道需要挂载配置文件目录和证书目录，有说法是不能修改默认的路径，这种说法是不对的，下面就以非默认路径来进行挂载

配置文件说明

• traefik.toml

logLevel = "INFO"
insecuresSkipVerify = true
defaultEntryPoints = ["http","https"]
[entryPoints]
  [entryPoints.http]
  address = ":80"
  [entryPoints.https]
  address = ":443"
    [entryPoints.https.tls]
      [[entryPoints.https.tls.certificates]]
      certFile = "/files/k8s-files/kubernetes/ssl/card/cr.xxxxxx.cn.pem"  # 1
      keyFile = "/files/k8s-files/kubernetes/ssl/card/cr.xxxxxx.cn.key"
      [[entryPoints.https.tls.certificates]]
      certFile = "/files/k8s-files/kubernetes/ssl/smart/smart.xxxxx.cn.pem" # 2
      keyFile = "/files/k8s-files/kubernetes/ssl/smart/smart.xxxxx.cn.key"
[respondingTimeouts]
readTimeout = "30s"
writeTimeout = "30s"
idleTimeout = "360s"
备注: 上面的1 和 2 两处都是将不同的证书放置于不同的目录(card和smart)下的，这个是k8s比较坑的一点，因为这个证书是需要挂载进traefik容器内部的，如果都将证书放到ssl这一个目录下面而不是ssl下面单独的子目录下面，那么将会覆盖之前的证书，也就是说只有一个证书是可用的。所以这个是这次添加多证书最大的坑。

• traefik-deployment.yaml
  这里就只贴上volume和volumeMounts两部分了

      containers:
      - image: traefik:latest
        imagePullPolicy: IfNotPresent
        name: traefik-ingress-lb
        volumeMounts:
        - name: "ssl-cr"
          mountPath: "/files/k8s-files/kubernetes/ssl/card"
        - name: "ssl-smart"
          mountPath: "/files/k8s-files/kubernetes/ssl/smart"
        - name: "config"
          mountPath: "/files/k8s-files/kubernetes/cfg"
        ports:
        - name: http
          containerPort: 80
        - name: https
          containerPort: 443
        - name: admin
          containerPort: 8080
        - name: zhuanfa
          containerPort: 5053 
        args:
        - --api
        - --kubernetes
        - --logLevel=INFO
        - --configfile=/files/k8s-files/kubernetes/cfg/traefik.toml
      volumes:
      - name: ssl-cr
        secret:
          secretName: traefik-cert-cr
      - name: ssl-smart
        secret:
          secretName: traefik-cert-smart
      - name: config
        configMap:
          name: traefik-conf   

证书生成

以smart.xxxxx.cn为例

cd /files/k8s-files/kubernetes/ssl
kubectl create secret generic traefik-cert-smart --from-file=./smart/smart.xxxxx.cn.pem --from-file=./smart/smart.xxxxx.cn.key -n kube-system

查看traefik-cert-smart这个secret

# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
data:
  smart.xxxxx.cn.key: base64encode   #可以看到这里的名字记录的和我们--from-file指定的名字相同
  smart.xxxxx.cn.pem: base64encode
kind: Secret
metadata:
  creationTimestamp: "2019-04-21T05:08:16Z"
  name: traefik-cert-smart
  namespace: kube-system
  resourceVersion: "2182167"
  selfLink: /api/v1/namespaces/kube-system/secrets/traefik-cert-smart
  uid: 789b5e66-63f3-11e9-9d89-00163e03c41e
type: Opaque

重建配置文件，重启traefik

cd /files/k8s-files/kubernetes/cfg
kubectl create configmap traefik-conf --from-file=traefik.toml -n kube-system

新建一个应用进行测试

• nginx-test-tls.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginxtls
  namespace: kube-system
  labels:
    addonmanager.kubernetes.io/mode: Reconcile
spec:
  template:
    metadata:
      labels:
        app: nginxtls
    spec:
      containers:
      - name: nginxtls
        image: nginx:1.12.2
        imagePullPolicy: IfNotPresent 
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginxtls
  labels:
    app: nginxtls
  namespace: kube-system
spec:
  selector:
    app: nginxtls
  ports:
  - name: http
    port: 80
    targetPort: 80
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginxtls
  namespace: kube-system
  annotations:
    kubernetes.io/ingress.class: traefik
    traefik.frontend.rule.type: PathPrefixStrip
spec:
  #tls:  注意这里的tls就不要添加了
  #- secretName: traefik-cert-smart
  rules:
  - host: smart.xxxxx.cn
    http:
      paths:
      - path: / 
        backend:
          serviceName: nginxtls 
          servicePort: 80

kubectl create -f nginx-test-tls.yaml

访问测试

ok，traefik添加多证书到此结束啦！希望能够帮助到你！