5.kubernetes的服务暴露插件-Traefik

部署traefik

在HDSS7-200.host.com上

[root@hdss7-200 k8s-yaml]# docker pull traefik:v1.7.2-alpine
[root@hdss7-200 k8s-yaml]# docker images |grep traefik
[root@hdss7-200 k8s-yaml]# docker tag add5fac61ae5 harbor.fx.com/public/traefik:v1.7.2
[root@hdss7-200 k8s-yaml]# docker push harbor.fx.com/public/traefik:v1.7.2

准备资源配置清单

在HDSS7-200.host.com上

[root@hdss7-200 traefik]# mkdir -p /data/k8s-yaml/traefik && cd /data/k8s-yaml/traefik

rbac.yaml

[root@hdss7-200 traefik]# vim 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

ds.yaml

[root@hdss7-200 traefik]# vim 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.fx.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

svc.yaml

[root@hdss7-200 traefik]# vim svc.yaml
kind: Service
apiVersion: v1
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

ingress.yaml

[root@hdss7-200 traefik]# vim 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.fx.com
    http:
      paths:
      - path: /
        backend:
          serviceName: traefik-ingress-service
          servicePort: 8080

应用资源配置清单

[root@hdss7-21 ~]# kubectl apply -f http://k8s-yaml.fx.com/traefik/rbac.yaml
[root@hdss7-21 ~]# kubectl apply -f http://k8s-yaml.fx.com/traefik/ds.yaml
[root@hdss7-21 ~]# kubectl apply -f http://k8s-yaml.fx.com/traefik/svc.yaml
[root@hdss7-21 ~]# kubectl apply -f http://k8s-yaml.fx.com/traefik/ingress.yaml

检查创建资源

[root@hdss7-21 ~]# kubectl get pods -n kube-system
NAME                       READY   STATUS    RESTARTS   AGE
coredns-65cb567d6f-4x5tn   1/1     Running   0          15h
traefik-ingress-7p7z4      1/1     Running   0          19m
traefik-ingress-f6kpc      1/1     Running   0          19m

解析域名

[root@hdss7-11 ~]# vim /var/named/fx.com.zone 
$ORIGIN fx.com.
$TTL 600        ; 10 minutes
@               IN SOA  dns.fx.com. dnsadmin.fx.com. (
                        2020061010  ; serial
                         10800      ; refresh (3 hours)
                         900        ; retry (15 minutes)
                         604800     ; expire (1 week)
                         86400      ; minimum (1 day)
                         )
                        NS      dns.fx.com.
$TTL 60 ; 1 minute
dns             A       10.4.7.11
harbor          A       10.4.7.200
k8s-yaml        A       10.4.7.200
traefik         A       10.4.7.10
[root@hdss7-11 ~]# systemctl restart named

配置反向代理

[root@hdss7-11 ~]# vim /etc/nginx/conf.d/fx.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 *.fx.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;
    }
}
[root@hdss7-11 ~]# nginx -t
[root@hdss7-11 ~]# nginx -s reload

注:HDSS7-12.host.com也需要配置nginx

浏览器访问

http://traefik.fx.com/