11 安装traefik

yum install -y http://rpms.remirepo.net/enterprise/remi-release-7.rpm
yum install php72-php php72-php-cli php72-php-common php72-php-devel
php72-php-embedded php72-php-gd php72-php-mbstring php72-php-pdo
php72-php-xml php72-php-fpm php72-php-mysqlnd php72-php-opcache
php72-php-mcrypt php72-php-pecl-memcached php72-php-pecl-redis php72-php-pecl-zip -y
php72-php-intl

服务在K8S集群外被访问

使用NodePort型service
无法使用kube-proxy的ipvs模型，只能使用iptables模型
–proxy-mode=iptables
–ipvs-scheduler=rr

使用Ingress资源
Ingress只能调度并暴露7层应用，特指http和https协议

Ingress是K8S API的标准资源类型之一，也是一种核心资源，它其实就是一组基于域名和URL路径，把用户的请求转发至指定service资源的规则

可以将集群外部的请求流量转发只集群内部，从而实现服务暴露

Ingress控制器是能够为Ingress资源监听某套接字，然后根据Ingress规则匹配机制路由调度流量的一个组件

常用的Ingress控制器
    Ingress-nginx
    HAProxy
    Traefix

部署traefix

https://github.com/containous/traefik

docker pull traefik:v1.7.2-alpine
docker tag add5fac61ae5 harbor.rongbiz.cn/public/traefik:v1.7.2
docker push harbor.rongbiz.cn/public/traefik:v1.7.2 

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

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.rongbiz.cn/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://192.168.1.200:7443
        - --accesslog
        - --accesslog.filepath=/var/log/traefik_access.log
        - --traefiklog
        - --traefiklog.filepath=/var/log/traefik.log
        - --metrics.prometheus

vi 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

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.rongbiz.cn
    http:
      paths:
      - path: /
        backend:
          serviceName: traefik-ingress-service
          servicePort: 8080

kubectl apply -f http://k8s-yaml.rongbiz.cn/traefik/rbac.yaml
kubectl apply -f http://k8s-yaml.rongbiz.cn/traefik/ds.yaml
kubectl apply -f http://k8s-yaml.rongbiz.cn/traefik/svc.yaml
kubectl apply -f http://k8s-yaml.rongbiz.cn/traefik/ingress.yaml

重启kubelet，重启docker

rstx-201和rstx-202上：

vim /etc/nginx/conf.d/rongbiz.cn.conf

upstream default_backend_traefik {
    server 192.168.1.203:81    max_fails=3 fail_timeout=10s;
    server 192.168.1.204:81    max_fails=3 fail_timeout=10s;
	server 192.168.1.205:81    max_fails=3 fail_timeout=10s;
}
server {
    server_name *.rongbiz.cn;
  
    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 -s reload
 

配置dns解析

cat /var/named/rongbiz.cn.zone

$ORIGIN rongbiz.cn.
$TTL 600	; 10 minutes
@   		IN SOA	dns.rongbiz.cn. dnsadmin.rongbiz.cn. (
				2020053004 ; serial
				10800      ; refresh (3 hours)
				900        ; retry (15 minutes)
				604800     ; expire (1 week)
				86400      ; minimum (1 day)
				)
				NS   dns.rongbiz.cn.
$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    192.168.1.200

systemctl restart named

浏览器访问traefik：
http://traefik.rongbiz.cn