概述

由于Pod和Service都是k8s集群范围内的虚拟概念，一切集群外的客户端体系无法经过Pod的IP或许Service的虚拟IP和端口访问它们。为了让外部客户端访问这些服务，可以将Pod和Service的端口号映射到宿主机，以使客户端使用能经过物理机访问容器使用。

将容器使用的端口号映射到物理机

  • 经过设置容器等级的hostPort，将容器使用的端口号映射到物理机上

    apiVersion: v1
kind: Pod
metadata:
  name: webapp
  labels:
    app: webapp
spec:
  containers:
  - name: webapp
    image: tomcat
    ports:
    - containerPort: 8080
      hostPort: 8081

    创立并检查成果

    [root@master1 service]# kubectl apply -f 09.yaml
pod/webapp created
[root@master1 service]# kubectl get pod
NAME     READY   STATUS    RESTARTS   AGE
webapp   1/1     Running   0          4m2s

    经过物理地址的IP和8081端口访问Pod的容器服务

    <!doctype html><html lang="en"><head><title>HTTP Status 404 – Not Found</title><style type="text/css">body {font-family:Tahoma,Arial,sans-serif;} h1, h2, h3, b {color:white;background-color:#525D76;} h1 {font-size:22px;} h2 {font-size:16px;} h3 {font-size:14px;} p {font-size:12px;} a {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP Status 404 – Not Found</h1><hr class="line" /><p><b>Type</b> Status Report</p><p><b>Description</b> The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.</p><hr class="line" /><h3>Apache Tomcat/10.0.14</h3></body></html>

  • 经过设置Pod等级的hostNetwork=true

    该Pod中一切容器的端口都将被直接映射到物理机上。在设置hostNetwork=true时需要注意，在容器的Ports界说部分假如不指定hostPort，则默认hostPort等于containerPort，假如指定了hostPort，则hostPort必须等于containerPort的值

    apiVersion: v1
kind: Pod
metadata:
  name: webapp
  labels:
    app: webapp
spec:
  hostNetwork: true
  containers:
  - name: webapp
    image: tomcat
    imagePullPolicy: Never
    ports:
    - containerPort: 8080

    运转并检查成果

    [root@master1 service]# kubectl apply -f 10.yaml
pod/webapp created
[root@master1 service]# kubectl get pod -o wide
NAME     READY   STATUS    RESTARTS   AGE    IP               NODE    NOMINATED NODE   READINESS GATES
webapp   1/1     Running   0          5m8s   192.168.40.182   node1   <none>           <none>

    访问

<!doctype html><html lang="en"><head><title>HTTP Status 404 – Not Found</title><style type="text/css">body {font-family:Tahoma,Arial,sans-serif;} h1, h2, h3, b {color:white;background-color:#525D76;} h1 {font-size:22px;} h2 {font-size:16px;} h3 {font-size:14px;} p {font-size:12px;} a {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP Status 404 – Not Found</h1><hr class="line" /><p><b>Type</b> Status Report</p><p><b>Description</b> The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.</p><hr class="line" /><h3>Apache Tomcat/10.0.14</h3></body></html>

将Service映射到物理机

  • 经过设置nodePort映射到物理机

    示例Pod

    apiVersion: v1
kind: Pod
metadata:
  name: webapp
  labels:
    app: webapp
spec:
  containers:
  - name: webapp
    image: tomcat
    imagePullPolicy: Never
    ports:
    - containerPort: 8080

    创立Service

    apiVersion: v1
kind: Service
metadata:
  name: webapp
spec:
  type: NodePort
  ports:
  - port: 8080
    targetPort: 8080
    nodePort: 30660
  selector:
    app: webapp

    创立并查询成果

    [root@master1 service]# kubectl get svc -o wide
NAME     TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE   SELECTOR
webapp   NodePort   10.10.157.91   <none>        8080:30660/TCP   54s   app=webapp

    经过宿主机 端口访问

    curl 192.168.40.180:30660

    <!doctype html><html lang="en"><head><title>HTTP Status 404 – Not Found</title><style type="text/css">body {font-family:Tahoma,Arial,sans-serif;} h1, h2, h3, b {color:white;background-color:#525D76;} h1 {font-size:22px;} h2 {font-size:16px;} h3 {font-size:14px;} p {font-size:12px;} a {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP Status 404 – Not Found</h1><hr class="line" /><p><b>Type</b> Status Report</p><p><b>Description</b> The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.</p><hr class="line" /><h3>Apache Tomcat/10.0.14</h3></body></html>
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