搭建及使用K8s集群 <使用ingress 暴露springcloud服务>

使用ingress 暴露springcloud服务

k8s 集群搭建成功了，也能部署应用了，但是不可能每次去访问服务的时候都要去查一下运行的node和nodePort吧，即使查好node和nodePort ，避免不了重启k8s或者 ReplicationController，node 和 nodeport 又会改变，K8s 提供了 Ingress 来解决这个问题。

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1.生成一个默认的后端

生成一个默认的后端，如果遇到解析不到的URL就转发到默认后端页面

[root@master ingress]# cat default-backend.yaml apiVersion: extensions/v1beta1kind: Deploymentmetadata:  name: default-http-backend  labels:    k8s-app: default-http-backend  namespace: defaultspec:  replicas: 1  template:    metadata:      labels:        k8s-app: default-http-backend    spec:      terminationGracePeriodSeconds: 60      containers:      - name: default-http-backend        # Any image is permissable as long as:        # 1. It serves a 404 page at /        # 2. It serves 200 on a /healthz endpoint        image: docker.io/cdchen/defaultbackend:1.0         livenessProbe:          httpGet:            path: /healthz            port: 8080            scheme: HTTP          initialDelaySeconds: 30          timeoutSeconds: 5        ports:        - containerPort: 8080        resources:          limits:            cpu: 10m            memory: 20Mi          requests:            cpu: 10m            memory: 20Mi---apiVersion: v1kind: Servicemetadata:  name: default-http-backend  namespace: default  labels:    k8s-app: default-http-backendspec:  ports:  - port: 80    targetPort: 8080  selector:    k8s-app: default-http-backend

[root@master ingress]# kubectl create -f default-backend.yaml deployment "default-http-backend" createdservice "default-http-backend" created

2.部署Ingress Controller

点击查看官方yaml

[root@master ingress]# cat  nginx-ingress-controller.yaml apiVersion: v1kind: ReplicationControllermetadata:  name: nginx-ingress-lb  labels:    name: nginx-ingress-lb  namespace: defaultspec:  replicas: 1  template:    metadata:      labels:        name: nginx-ingress-lb      annotations:        prometheus.io/port: '10254'        prometheus.io/scrape: 'true'    spec:      terminationGracePeriodSeconds: 60      hostNetwork: true      containers:      - image: docker.io/cdchen/nginx-ingress-controller:0.9.0-beta.12         name: nginx-ingress-lb        readinessProbe:          httpGet:            path: /healthz            port: 10254            scheme: HTTP        livenessProbe:          httpGet:            path: /healthz            port: 10254            scheme: HTTP          initialDelaySeconds: 10          timeoutSeconds: 1        ports:        - containerPort: 80          hostPort: 80        - containerPort: 443          hostPort: 443        env:          - name: POD_NAME            valueFrom:              fieldRef:                fieldPath: metadata.name          - name: POD_NAMESPACE            valueFrom:              fieldRef:                fieldPath: metadata.namespace          - name: KUBERNETES_MASTER            value: http://192.168.6.150:8080        args:        - /nginx-ingress-controller        - --default-backend-service=$(POD_NAMESPACE)/default-http-backend        - --apiserver-host=http://192.168.6.45:8080

记得修改 - –apiserver-host=http://192.168.6.45:8080

[root@master ingress]# kubectl create -f nginx-ingress-controller.yaml replicationcontroller "nginx-ingress-lb" created

3.配置ingress

贴一个k8s dashboard 的 ingress配置

[root@master ingress]# cat k8s-dashboard.yaml apiVersion: extensions/v1beta1kind: Ingressmetadata:  name: k8s-dashboard-ingress  namespace: kube-systemspec:  rules:  - host: k8s.webui    http:      paths:      - path: /        backend:          serviceName: kubernetes-dashboard          servicePort: 80

[root@master ingress]# kubectl create -f k8s-dashboard.yaml ingress "k8s-dashboard-ingress" created

理解如下:

• host指虚拟出来的域名，具体地址(我理解应该是Ingress-controller那台Pod所在的主机的地址)应该加入/etc/hosts中,这样所有去k8s.webui的请求都会发到nginx
• path:/console匹配后面的应用路径
• servicePort主要是定义服务的时候的端口，不是NodePort.
• path:/ 匹配后面dashboard应用的路径

在 node 节点中docker ps 查看是否存在ingress Controller，然后把对应的ip添加进本机host，
在浏览器内访问 http://k8s.webui/
如下图：

贴一个前一篇博客介绍的多应用的部署的ingress 配置文件

[root@master ingress]# cat cloud-vue.yaml apiVersion: extensions/v1beta1kind: Ingressmetadata:  name: cloud-vue-api  namespace: defaultspec:  rules:  - host: cloud.vue.api    http:      paths:      - path: /console        backend:          serviceName: helloworldsvc           servicePort: 7001      - path: /        backend:          serviceName: cloud-simple-server          servicePort: 8081  - host: cloud.vue.eureka    http:      paths:      - path: /        backend:          serviceName: cloud-eureka-server          servicePort: 8888  - host: cloud.vue.config    http:      paths:      - path: /        backend:          serviceName: cloud-config-server          servicePort: 1111   - host: cloud.vue.zipkin    http:      paths:      - path: /        backend:          serviceName: cloud-zipkin-server          servicePort: 9012

注：已经使用ingress暴露服务了，再部署的时候service的类型可以选择internal了 ，不再需要external。还有https的配置，请参考 http://www.cnblogs.com/ericnie/p/6965091.html

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