无法从Minikube获取ClusterIP服务URL [英] Unable to get ClusterIP service url from minikube

问题描述

我已根据下面的配置文件创建了一个ClusterIP服务，但似乎无法从mini kube获取该服务的URL

k create -f service-cluster-definition.yaml
➜ minikube service myapp-frontend --url                                           
😿  service default/myapp-frontend has no node port

如果我尝试将NodePort添加到SERVICE-CLUSTER-DEFINItion.yaml的port部分，它会报告错误，这样的键已被弃用。

我遗漏了什么或做错了什么？

service-cluster-definition.yaml

apiVersion: v1
kind: Service
metadata:
  name: myapp-frontend
spec:
  type: ClusterIP
  ports:
    - targetPort: 80
      port: 80
  selector:
    app: myapp
    type: etl

deployment-definition.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-deployment
  labels:
    app: myapp
    env: experiment
    type: etl
spec:
  template:
    metadata:
      name: myapp-pod
      labels:
        app: myapp
        env: experiment
        type: etl
    spec:
      containers:
        - name: nginx-container
          image: nginx:1.7.1
  replicas: 3
  selector:
    matchLabels:
      type: etl

➜ k get pods --selector="app=myapp,type=etl" -o wide
NAME                                READY   STATUS    RESTARTS   AGE   IP           NODE       NOMINATED NODE   READINESS GATES
myapp-deployment-59856c4487-2g9c7   1/1     Running   0          45m   172.17.0.9   minikube   <none>           <none>
myapp-deployment-59856c4487-mb28z   1/1     Running   0          45m   172.17.0.4   minikube   <none>           <none>
myapp-deployment-59856c4487-sqxqg   1/1     Running   0          45m   172.17.0.8   minikube   <none>           <none>


(⎈ |minikube:default)
Projects/experiments/kubernetes 
➜ k version     
Client Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.3", GitCommit:"06ad960bfd03b39c8310aaf92d1e7c12ce618213", GitTreeState:"clean", BuildDate:"2020-02-11T18:14:22Z", GoVersion:"go1.13.6", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.3", GitCommit:"06ad960bfd03b39c8310aaf92d1e7c12ce618213", GitTreeState:"clean", BuildDate:"2020-02-11T18:07:13Z", GoVersion:"go1.13.6", Compiler:"gc", Platform:"linux/amd64"}
(⎈ |minikube:default)

推荐答案

首先让我们澄清一下Documentation中的一些概念：

• ClusterIP：在集群内部IP上公开服务。 选择此值使服务只能从群集中访问。

• NodePort：在静态端口(NodePort)上公开每个节点的IP上的服务。 您可以通过请求NodeIP:NodePort联系NodePort服务。

---

问题1：

我已根据下面的配置文件创建了一个ClusterIP服务，但似乎无法从mini kube获取该服务的URL。

• 因为Minikube是单个主机上的虚拟环境，所以我们往往会忘记集群与主机是隔离的。如果将服务设置为ClusterIP，Minikube将不会授予外部访问权限。

问题2：

如果我尝试将NodePort添加到服务-群集-定义.yaml的端口部分，它会报告错误，这样的键已被弃用。

• 可能您粘贴到了错误的位置。您只需将type: ClusterIP替换为type: NodePort即可。以下是您的YAML的正确格式：

apiVersion: v1
kind: Service
metadata:
  name: myapp-frontend
spec:
  type: NodePort
  ports:
    - targetPort: 80
      port: 80
  selector:
    app: myapp
    type: etl

---

复制：

user@minikube:~$ kubectl apply -f deployment-definition.yaml 
deployment.apps/myapp-deployment created

user@minikube:~$ kubectl get pods
NAME                                READY   STATUS    RESTARTS   AGE
myapp-deployment-59856c4487-7dw6x   1/1     Running   0          5m11s
myapp-deployment-59856c4487-th7ff   1/1     Running   0          5m11s
myapp-deployment-59856c4487-zvm5f   1/1     Running   0          5m11s

user@minikube:~$ kubectl apply -f service-cluster-definition.yaml 
service/myapp-frontend created

user@minikube:~$ kubectl get service myapp-frontend
NAME             TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
myapp-frontend   NodePort    10.101.156.113   <none>        80:32420/TCP   3m43s

user@minikube:~$ minikube service list
|-------------|----------------|-----------------------------|-----|
|  NAMESPACE  |      NAME      |         TARGET PORT         | URL |
|-------------|----------------|-----------------------------|-----|
| default     | kubernetes     | No node port                |     |
| default     | myapp-frontend | http://192.168.39.219:32420 |     |
| kube-system | kube-dns       | No node port                |     |
|-------------|----------------|-----------------------------|-----|

user@minikube:~$ minikube service myapp-frontend --url
http://192.168.39.219:32420

user@minikube:~$ curl http://192.168.39.219:32420
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
...{{output suppressed}}...

• 如您所见，服务设置为NodePort时，mini开始使用MinikubeIP:NodePort路由连接到匹配的Pod来为应用程序提供服务。
  • 请注意，默认情况下将在30000：32767之间选择nodeport

如果您有任何问题，请在评论中告诉我。

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