簡介

Trafik，和nginx-ingress類似，都是用於微服務叢集的HTTP/HTTPS代理轉發和負載均衡的。
相對nginx-ingress來說, Traefik部署更簡單，其反向代理和負載均衡功能更直接高效。
本節主要說明如何在kubernetes1.11上安裝traefik，及配置https轉發的流程。

安裝Traefik

• 下載源安裝包

[[email protected] DevOps]# git clone https://github.com/containous/traefik.git
[[email protected] DevOps]
 
# cd traefik/examples/k8s
[[email protected] k8s]# ls
cheese-default-ingress.yaml  cheese-services.yaml             traefik-deployment.yaml         traefik-rbac.yaml
cheese-deployments.yaml      cheeses-ingress.yaml             ui.yaml
cheese-ingress.yaml          traefik-ds.yaml

一般來說，我們只需要配置及部署traefik-deployment.yaml

• 建立traefik-rbac

因為Kubernetes在1.6之後的版本啟用了RBAC鑑權機制，所以需配置ClusterRole及ClusterRoleBinding來對api-server進行相應許可權的控制。

[[email protected] k8s]# kubectl apply -f traefik-rbac.yaml 
clusterrole.rbac.authorization.k8s.io "traefik-ingress-controller" created
clusterrolebinding.rbac.authorization.k8s.io "traefik-ingress-controller"
 
 created

#檢查是否建立成功
[[email protected] k8s]# kubectl get clusterrolebinding | grep traefik
traefik-ingress-controller                             5s
[[email protected] k8s]# kubectl get clusterrole | grep traefik
traefik-ingress-controller                                             13s

可以此時看到已經完成clusterrole，clusterrolebinding的建立了。

• 建立traefik服務

[[email protected] k8s]# kubectl apply -f traefik-deployment.yaml 
serviceaccount "traefik-ingress-controller" created
deployment.extensions "traefik-ingress-controller" created
service "traefik-ingress-service" created

#檢查是否建立成功
[[email protected] k8s]# kubectl get svc,deployment,pod -n kube-system | grep traefik
service/traefik-ingress-service   NodePort    10.104.254.55    <none>        80:32672/TCP,8080:30005/TCP   15h
deployment.extensions/traefik-ingress-controller   1         1         1            1           2d
pod/traefik-ingress-controller-6f6d87769d-l7vgv   1/1       Running   0          15h

可以看到service，pod等都已經執行起來。

• 建立ui服務

  • (1)修改ui.yaml

---
apiVersion: v1
kind: Service
metadata:
  name: traefik-web-ui
  namespace: kube-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: kube-system
  annotations:            ## 添加註解, 定義ingress.class為traefik
    kubernetes.io/ingress.class: traefik
spec:
  tls:
    - secretName: traefik-cert
  rules:
  - host: traefik.example.com  ## 主要修改這裡，把host改為你自己的
    http:
      paths:
      - path: /
        backend:
          serviceName: traefik-web-ui
          servicePort: web

• (2)建立service及檢查

[[email protected] k8s]# kubectl apply -f ui.yaml
service "traefik-web-ui" created
ingress.extensions "traefik-web-ui" created

# 檢查是否建立成功
[[email protected] k8s]# kubectl describe ing traefik-web-ui -n kube-system
Name:             traefik-web-ui
Namespace:        kube-system
Address:          
Default backend:  default-http-backend:80 (<none>)
Rules:
  Host                   Path  Backends
  ----                   ----  --------
  traefik.example.com  
                         /   traefik-web-ui:web (10.244.2.43:8080,192.168.1.49:8080,192.168.1.50:8080)
Annotations:
  kubectl.kubernetes.io/last-applied-configuration:  {"apiVersion":"extensions/v1beta1","kind":"Ingress","metadata":{"annotations":{"kubernetes.io/ingress.class":"traefik"},"name":"traefik-web-ui","namespace":"kube-system"},"spec":{"rules":[{"host":"traefik.example.com","http":{"paths":[{"backend":{"serviceName":"traefik-web-ui","servicePort":"web"},"path":"/"}]}}]}}

  kubernetes.io/ingress.class:  traefik
Events:                         <none>

[[email protected] k8s]# kubectl get ing traefik-web-ui -n kube-system
NAME             HOSTS                   ADDRESS   PORTS     AGE
traefik-web-ui   traefik.example.com             80   15h

• 瀏覽器訪問traefik

修改本機host或新增公網域名解析，通過traefik.example.com來訪問, 效果如下：