一、背景

1.      rancher、kubernetes-dashboard等应用需要通过https方式访问，所以此次部署将开启traefik对https的支持。

2.      基于之前的rancher HA是部署在cattle-system命名空间下的，所以此次同样将traefik部署在cattle-system命名空间下，并且使用同样的tls证书。

二、traefik部署

1.  创建RBAC策略，为service account授权

            RBAC清单文件traefik-rbac.yaml如下：

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: traefik-ingress-controller
  namespace: cattle-system
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: traefik-ingress-controller
rules:
  - apiGroups:
      - ""
    resources:
      - services
      - endpoints
      - secrets
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - extensions
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: traefik-ingress-controller
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: traefik-ingress-controller
subjects:
- kind: ServiceAccount
  name: traefik-ingress-controller
  namespace: cattle-system

          应用清单文件

[root@k8s-master03 traefik]# kubectl apply -f traefik-rbac.yaml
serviceaccount/traefik-ingress-controller created
clusterrole.rbac.authorization.k8s.io/traefik-ingress-controller created
clusterrolebinding.rbac.authorization.k8s.io/traefik-ingress-controller created

2.  使用DamonSet控制器部署traefik

            damonset清单文件traefik-ds.yaml如下：

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: traefik-conf
  namespace: cattle-system
data:
  traefik.toml: |
    insecureSkipVerify = true
    defaultEntryPoints = ["http","https"]
    [entryPoints]
      [entryPoints.http]
      address = ":80"
      [entryPoints.https]
      address = ":443"
        [entryPoints.https.tls]
          [[entryPoints.https.tls.certificates]]
          CertFile = "/ssl/tls.crt"
          KeyFile = "/ssl/tls.key"
---
kind: DaemonSet
apiVersion: extensions/v1beta1
metadata:
  name: traefik-ingress-controller
  namespace: cattle-system
  labels:
    k8s-app: traefik-ingress-lb
spec:
  template:
    metadata:
      labels:
        k8s-app: traefik-ingress-lb
        name: traefik-ingress-lb
    spec:
      serviceAccountName: traefik-ingress-controller
      terminationGracePeriodSeconds: 60
      hostNetwork: true
      volumes:
      - name: ssl
        secret:
          secretName: tls-rancher-ingress
      - name: config
        configMap:
          name: traefik-conf
      containers:
      - image: traefik
        name: traefik-ingress-lb
        ports:
        - name: http
          containerPort: 80
          hostPort: 80
        - name: admin
          containerPort: 8080
        securityContext:
          privileged: true
        args:
        - --configfile=/config/traefik.toml
        - -d
        - --web
        - --kubernetes
        volumeMounts:
        - mountPath: "/ssl"
          name: "ssl"
        - mountPath: "/config"
          name: "config"
---
kind: Service
apiVersion: v1
metadata:
  name: traefik-ingress-service
  namespace: cattle-system
spec:
  selector:
    k8s-app: traefik-ingress-lb
  ports:
    - protocol: TCP
      port: 80
      name: web
    - protocol: TCP
      port: 8080
      name: admin
    - protocol: TCP
      port: 443
      name: https
  #type: NodePort

            应用清单文件

[root@k8s-master03 traefik]# kubectl apply -f traefik-ds.yaml
configmap/traefik-conf created
daemonset.extensions/traefik-ingress-controller created
service/traefik-ingress-service created

3.  为traefik UI配置转发

            ingress清单文件traefik-ui.yaml如下：

apiVersion: v1
kind: Service
metadata:
  name: traefik-web-ui
  namespace: cattle-system
spec:
  selector:
    k8s-app: traefik-ingress-lb
  ports:
  - name: web
    port: 80
    targetPort: 8080
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: traefik-web-ui
  namespace: cattle-system
spec:
  rules:
  - host: traefik-ui.sumapay.com
    http:
      paths:
      - path: /
        backend:
          serviceName: traefik-web-ui
          servicePort: web

            应用清单文件

[root@k8s-master03 traefik]# kubectl apply -f traefik-ui.yaml
service/traefik-web-ui created
ingress.extensions/traefik-web-ui created

 4.查看

[root@k8s-master01 ~]# kubectl get pods -n cattle-system
NAME                                    READY   STATUS    RESTARTS   AGE
cattle-cluster-agent-594b8f79bb-pgmdt   1/1     Running   5          11d
cattle-node-agent-lg44f                 1/1     Running   0          11d
cattle-node-agent-zgdms                 1/1     Running   5          11d
rancher2-9774897c-622sc                 1/1     Running   0          9d
rancher2-9774897c-czxxx                 1/1     Running   0          9d
rancher2-9774897c-sm2n5                 1/1     Running   1          9d
traefik-ingress-controller-hj9nc        1/1     Running   0          142m
traefik-ingress-controller-vxcgt        1/1     Running   0          142m
 
[root@k8s-master01 ~]# kubectl get svc -n cattle-system   
NAME                      TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                   AGE
rancher2                  ClusterIP   10.111.16.80            80/TCP                    9d
traefik-ingress-service   ClusterIP   10.111.121.27           80/TCP,8080/TCP,443/TCP   143m
traefik-web-ui            ClusterIP   10.103.112.22           80/TCP                    136m
 
[root@k8s-master01 ~]# kubectl get ingress -n cattle-system  
NAME             HOSTS                    ADDRESS   PORTS     AGE
rancher2         rancher.sumapay.com                80, 443   9d
traefik-web-ui   traefik-ui.sumapay.com             80        137m

将域名映射到外部负载均衡IP后，就可以通过域名访问traefik UI和rancher HA服务了。