Kubernetes v1.9.7安装部署-配置Ingress Controller

Ingress其实就是从kuberenets集群外部访问集群的一个入口,将外部的请求转发到集群内不同的Service 上,其实就相当于nginx、apache 等负载均衡代理服务器,再加上一个规则定义,路由信息的刷新需要靠Ingress controller来提供。Ingress controller可以理解为一个监听器,通过不断地与kube-apiserver打交道,实时的感知后端service、pod 等的变化,当得到这些变化信息后,Ingress controller再结合Ingress的配置,更新反向代理负载均衡器,达到服务发现的作用。其实这点和服务发现工具consul的consul-template非常类似。

1、部署traefik

Traefik是一款开源的反向代理与负载均衡工具。它最大的优点是能够与常见的微服务系统直接整合,可以实现自动化动态配置。目前支持Docker、Swarm、Mesos/Marathon、 Mesos、Kubernetes、Consul、Etcd、Zookeeper、BoltDB、Rest API等等后端模型。

img

2、创建rbac

创建文件:ingress-rbac.yaml,用于service account验证:

apiVersion: v1
kind: ServiceAccount
metadata:
  name: ingress
  namespace: kube-system
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: ingress
subjects:
  - kind: ServiceAccount
    name: ingress
    namespace: kube-system
roleRef:
  kind: ClusterRole
  name: cluster-admin
  apiGroup: rbac.authorization.k8s.io

3、DaemonSet 形式部署traefik

创建文件:traefik-daemonset.yaml,为保证traefik 总能提供服务,在每个节点上都部署一个traefik,所以这里使用DaemonSet 的形式。

使用http的yaml配置:

kind: ConfigMap
apiVersion: v1
metadata:
  name: traefik-conf
  namespace: kube-system
data:
  traefik-config: |-
    defaultEntryPoints = ["http","https"]
    [entryPoints]
      [entryPoints.http]
      address = ":80"
        [entryPoints.http.redirect]
          entryPoint = "https"
      [entryPoints.https]
      address = ":443"
        [entryPoints.https.tls]
          [[entryPoints.https.tls.certificates]]
          CertFile = "/ssl/ssl.crt"
          KeyFile = "/ssl/ssl.key"

使用https的yaml配置。创建文件:traefik-daemonset.yaml,为保证traefik 总能提供服务,在每个节点上都部署一个traefik,所以这里使用DaemonSet 的形式

kind: DaemonSet
apiVersion: extensions/v1beta1
metadata:
  name: traefik-ingress
  namespace: kube-system
  labels:
    k8s-app: traefik-ingress
spec:
  template:
    metadata:
      labels:
        k8s-app: traefik-ingress
        name: traefik-ingress
    spec:
      terminationGracePeriodSeconds: 60
      restartPolicy: Always
      serviceAccountName: ingress
      containers:
      - image: traefik:latest
        name: traefik-ingress
        ports:
        - name: http
          containerPort: 80
          hostPort: 80
        - name: https
          containerPort: 443
          hostPort: 443
        - name: admin
          containerPort: 8080
        args:
        - --configFile=/etc/traefik/traefik.toml
        - -d
        - --web
        - --kubernetes
        - --logLevel=DEBUG
        volumeMounts:
        - name: traefik-config-volume
          mountPath: /etc/traefik
        - name: traefik-ssl-volume
          mountPath: /ssl
      volumes:
      - name: traefik-config-volume
        configMap:
          name: traefik-conf
          items:
          - key: traefik-config
            path: traefik.toml
      - name: traefik-ssl-volume
        secret:
          secretName: traefik-ssl

注释:第二种使用https的yaml 文件中我们添加了一个名为traefik-conf的ConfigMap,该配置是用来将http 请求强制跳转成https,并指定https 所需CA 文件地址,这里我们使用secret的形式来指定CA 文件的路径:

$ ls
ssl.crt     ssl.key
$ kubectl create secret generic traefik-ssl --from-file=ssl.crt --from-file=ssl.key --namespace=kube-system
secret "traefik-ssl" created

4、创建Ingress

创建文件:traefik-ingress.yaml,现在可以通过创建ingress文件来定义请求规则了,根据自己集群中的service 自己修改相应的serviceName 和 servicePort:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: traefik-ingress
spec:
  rules:
  - host: traefik.nginx.io
    http:
      paths:
      - path: /
        backend:
          serviceName: my-nginx
          servicePort: 80

执行创建命令:

$ kubectl create -f ingress-rbac.yaml
serviceaccount "ingress" created
clusterrolebinding "ingress" created
$ kubectl create -f traefik-daemonset.yaml
configmap "traefik-conf" created
daemonset "traefik-ingress" created
$ kubectl create -f traefik-ingress.yaml
ingress "traefik-ingress" created

5、Traefik UI

创建文件:traefik-ui.yaml:

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

6、测试

部署完成后,在本地/etc/hosts添加一条配置:

# 将下面的xx.xx.xx.xx替换成任意节点IP
xx.xx.xx.xx master03 traefik.nginx.io traefik-ui.local

配置完成后,在本地访问:traefik-ui.local,则可以访问到traefik的dashboard页面:

img

同样的可以访问traefik.nginx.io,得到正确的结果页面:

img

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