kompose 不公开 NodePort - 用于桌面 Windows 的 Docker

Question

我有这个 docker-compose.yml 和 Docker for Desktop Windows 运行本地 kubernetes 集群（默认 docker-desktop 上下文）：

version: '3'
services:
  web:
    image: customnode
    ports:
    - "3000:3000"
    labels:
      kompose.service.type: nodeport

  datastore:
    image: custommongo
    ports:
    - "27017:27017"

docker-compose up -d 完美运行并将我的 NodeJS 暴露在 127.0.0.1 上的端口 3000 上。

我正在尝试迁移我的 k8s 集群，所以关注https://kompose.io/getting-started/

上面的页面说“如果您还没有运行 Kubernetes 集群，minikube 是最好的入门方式”...我已经在运行 OOTB Docker for Desktop 集群，所以我假设我不需要 minikube .

kompose convert
INFO Kubernetes file "datastore-service.yaml" created
INFO Kubernetes file "web-service.yaml" created
INFO Kubernetes file "datastore-deployment.yaml" created
INFO Kubernetes file "web-deployment.yaml" created

这里是 web-deployment 和 web-service YAMLS：

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  annotations:
    kompose.cmd: kompose convert
    kompose.service.type: nodeport
    kompose.version: 1.16.0 (0c01309)
  creationTimestamp: null
  labels:
    io.kompose.service: web
  name: web
spec:
  replicas: 1
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        io.kompose.service: web
    spec:
      containers:
        image: customnode
        name: web
        ports:
        - containerPort: 3000
        resources: {}
      restartPolicy: Always
status: {}

apiVersion: v1
kind: Service
metadata:
  annotations:
    kompose.cmd: kompose convert
    kompose.service.type: nodeport
    kompose.version: 1.16.0 (0c01309)
  creationTimestamp: null
  labels:
    io.kompose.service: web
  name: web
spec:
  ports:
  - name: "3000"
    port: 3000
    targetPort: 3000
  selector:
    io.kompose.service: web
  type: NodePort
status:
  loadBalancer: {}

最后，运行kompose up：

kompose up
[36mINFO[0m We are going to create Kubernetes Deployments, Services and PersistentVolumeClaims for your Dockerized application. If you need different kind of resources, use the 'kompose convert' and 'kubectl create -f' commands instead.

INFO Deploying application in "default" namespace
INFO Successfully created Service: datastore
INFO Successfully created Service: web
INFO Successfully created Deployment: datastore
INFO Successfully created Deployment: web

kubectl get svc的输出：

kubectl get svc
NAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
datastore    ClusterIP   10.103.***.***   <none>        27017/TCP        76s
kubernetes   ClusterIP   10.96.0.1        <none>        443/TCP          23m
web          NodePort    10.106.***.***     <none>        3000:32033/TCP   76s

如您所见，没有我期望的外部 IP。我确定这是我缺乏知识，而不是错误，所以我错过了什么？

Answer 1

外部 IP 仅分配给 LoadBalancer 类型的服务。 LoadBalancer 控制器必须安装在集群上，LoadBalancer 服务才能工作。否则 LoadBalancer 服务的行为与 NodePort 服务完全相同。大多数云提供商都支持LoadBalancer 服务。

对于NodePort 类型的服务，该服务绑定到所有节点上节点端口范围内的一个随机端口。在您的情况下，您可以看到，该服务绑定到端口 32033 - 3000:32033/TCP。

节点端口范围配置为 Kubernetes API 服务器的参数，选项为 --service-node-port-range（默认为 30000-32767）。当你创建一个 NodePort 类型的服务时，会从这个范围中选择一个随机的空闲端口。如果要选择自定义端口，可以在Port 对象中指定nodePort 属性。

例如：

apiVersion: v1
kind: Service
metadata:
  annotations:
    kompose.cmd: kompose convert
    kompose.service.type: nodeport
    kompose.version: 1.16.0 (0c01309)
  creationTimestamp: null
  labels:
    io.kompose.service: web
  name: web
spec:
  ports:
  - name: "3000"
    port: 3000
    targetPort: 3000
    nodePort: 30002         ###### You can choose node port here if needed
  selector:
    io.kompose.service: web
  type: NodePort           ####### Change this line to LoadBalancer if you want an external IP
status:
  loadBalancer: {}