部署kubernetes集群--服务暴露插件Traefik

部署traefik（ingressingress控制器）

准备traefik镜像

运维主机node7-200.host.com上：
~]# docker pull traefik:v1.7.2-alpine
~]# docker tag add5fac61ae5 harbor.od.com/public/traefik:v1.7.2
~]# docker push harbor.od.com/public/traefik:v1.7.2

准备资源配置清单

~]# mkdir -p /data/k8s-yaml/traefik && cd /data/k8s-yaml/traefik

vi rbac.yaml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: traefik-ingress-controller
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
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/v1beta1
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: kube-system

traefik]# vi ds.yaml

apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: traefik-ingress
  namespace: kube-system
  labels:
    k8s-app: traefik-ingress
spec:
  template:
    metadata:
      labels:
        k8s-app: traefik-ingress
        name: traefik-ingress
    spec:
      serviceAccountName: traefik-ingress-controller
      terminationGracePeriodSeconds: 60
      containers:
      - image: harbor.od.com/public/traefik:v1.7.2
        name: traefik-ingress
        ports:
        - name: controller
          containerPort: 80
          hostPort: 81
        - name: admin-web
          containerPort: 8080
        securityContext:
          capabilities:
            drop:
            - ALL
            add:
            - NET_BIND_SERVICE
        args:
        - --api
        - --kubernetes
        - --logLevel=INFO
        - --insecureskipverify=true
        - --kubernetes.endpoint=https://10.4.7.10:7443
        - --accesslog
        - --accesslog.filepath=/var/log/traefik_access.log
        - --traefiklog
        - --traefiklog.filepath=/var/log/traefik.log
        - --metrics.prometheus

traefik]# vi svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: traefik-ingress-service
  namespace: kube-system
spec:
  selector:
    k8s-app: traefik-ingress
  ports:
    - protocol: TCP
      port: 80
      name: controller
    - protocol: TCP
      port: 8080
      name: admin-web

traefik]# vi ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: traefik-web-ui
  namespace: kube-system
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host: traefik.od.com
    http:
      paths:
      - path: /
        backend:
          serviceName: traefik-ingress-service
          servicePort: 8080

解析域名

node7-11上
vi /var/named/od.com.zone

 traefik	 A  10.4.7.10

应用资源配置清单

在任意运算节点应用资源配置清单
~]# kubectl apply -f http://k8s-yaml.od.com/traefik/rbac.yaml
~]# kubectl apply -f http://k8s-yaml.od.com/traefik/ds.yaml
~]# kubectl apply -f http://k8s-yaml.od.com/traefik/svc.yaml
~]# kubectl apply -f http://k8s-yaml.od.com/traefik/ingress.yaml

配置反代

node7-11.host.com和node7-12.host.com两台主机上的nginx均需要配置
/etc/nginx/conf.d/od.com.conf

upstream default_backend_traefik {
    server 10.4.7.21:81    max_fails=3 fail_timeout=10s;
    server 10.4.7.22:81    max_fails=3 fail_timeout=10s;
}
server {
    server_name *.od.com;
  
    location / {
        proxy_pass http://default_backend_traefik;
        proxy_set_header Host       $http_host;
        proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
    }
}

~]# nginx -t
~]# nginx -s reload

浏览器访问

http://traefik.od.com