如何使用 NodePort 与 kind？

Question

我正在尝试使用 NodePort with kind 但不知何故它不想工作。

我已经成功部署了以下集群：

apiVersion: kind.x-k8s.io/v1alpha4
kind: Cluster
nodes:
- role: control-plane
  extraPortMappings:
  - containerPort: 80
    hostPort: 30000
    listenAddress: "0.0.0.0" # Optional, defaults to "0.0.0.0"
    protocol: tcp # Optional, defaults to tcp
- role: worker

然后是一个非常简单的部署：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hostname-deployment
  labels:
    app: hostname
spec:
  replicas: 2
  selector:
    matchLabels:
      app: hostname
  template:
    metadata:
      labels:
        app: hostname
    spec:
      containers:
      - name: hostname
        image: hostname:0.1
        ports:
        - containerPort: 80

和一项服务：

apiVersion: v1
kind: Service
metadata:
  name: hostname-service
spec:
  type: NodePort
  selector:
    app: hostname
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80
      nodePort: 30000

我可以通过例如

连接到该服务

(in one terminal)
k port-forward service/hostname-service 8080:80
Forwarding from 127.0.0.1:8080 -> 80

(another one)
curl localhost:8080
hostname: hostname-deployment-75c9fd6584-ddc59 at Wed, 17 Jun 2020 15:38:33 UTC

但是我无法通过暴露的 NodePort 连接到服务

curl -v localhost:30000
* Rebuilt URL to: localhost:30000/
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 30000 (#0)
> GET / HTTP/1.1
> Host: localhost:30000
> User-Agent: curl/7.58.0
> Accept: */*
>
* Recv failure: Connection reset by peer
* stopped the pause stream!
* Closing connection 0
curl: (56) Recv failure: Connection reset by peer

kubectl get all 输出：

NAME                                       READY   STATUS    RESTARTS   AGE
pod/hostname-deployment-75c9fd6584-ddc59   1/1     Running   0          34m
pod/hostname-deployment-75c9fd6584-tg8db   1/1     Running   0          34m

NAME                       TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
service/hostname-service   NodePort    10.107.104.231   <none>        80:30000/TCP   34m
service/kubernetes         ClusterIP   10.96.0.1        <none>        443/TCP        35m

NAME                                  READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/hostname-deployment   2/2     2            2           34m

NAME                                             DESIRED   CURRENT   READY   AGE
replicaset.apps/hostname-deployment-75c9fd6584   2         2         2       34m

Answer 1

需要像下面这样的集群配置

apiVersion: kind.x-k8s.io/v1alpha4
kind: Cluster
nodes:
- role: control-plane
  extraPortMappings:
  - containerPort: 30000
    hostPort: 30000
    listenAddress: "0.0.0.0" # Optional, defaults to "0.0.0.0"
    protocol: tcp # Optional, defaults to tcp
- role: worker

此文件随后作为 kind create cluster --config=config.yaml (according to docs).

传递给您的创建命令

Answer 2

我会尝试删除 nodePort: 30000 并检查新分配的 nodePort 是否与环回接口一起工作。如果您对服务进行更新，kube 会遇到静态分配的节点端口问题，您必须自己管理端口冲突。尝试删除部署并重新部署也有帮助。

Answer 3

实际上按照 Arghya Sadhu 的建议行事。不知道为什么答案被删除了。

apiVersion: kind.x-k8s.io/v1alpha4
kind: Cluster
nodes:
- role: control-plane
  extraPortMappings:
  - containerPort: 30000
    hostPort: 30000
    listenAddress: "0.0.0.0"
    protocol: tcp
- role: worker

Answer 4

我将分享我今天尝试使用多节点类集群时的答案，另一件重要的事情是需要注意 kubectl 客户端和服务器版本。我相信这会对某人有所帮助。

第 1 步

种类-api-cluster.yml

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
  extraPortMappings:
  - containerPort: 30950
    hostPort: 30950
    listenAddress: "127.0.0.1"
    protocol: TCP
- role: worker
- role: worker

第2步 Kubernetes 服务和部署文件。（注意这里kind的control-plane hostPort和kubernetes service的nodePort应该是一样的）

api.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: api
  labels:
    app: api
spec:
  replicas: 3
  selector:
    matchLabels:
      app: api
  template:
    metadata:
      labels:
        app: api
    spec:
      containers:
        - name: api
          image: api
          imagePullPolicy: Never
          ports:
            - containerPort: 8080
---
apiVersion: v1
kind: Service
metadata:
  name: api-svc
spec:
  selector:
    app: api
  type: NodePort
  ports:
    - name: http
      nodePort: 30950
      targetPort: 8080
      port: 8080

补充说明：-

kubectl 版本

Client Version: version.Info{Major:"1", Minor:"20+", GitVersion:"v1.20.4-dirty", GitCommit:"e87da0bd6e03ec3fea7933c4b5263d151aafd07c", GitTreeState:"dirty", BuildDate:"2021-03-15T09:55:27Z", GoVersion:"go1.16.2", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"20", GitVersion:"v1.20.2", GitCommit:"faecb196815e248d3ecfb03c680a4507229c2a56", GitTreeState:"clean", BuildDate:"2021-01-21T01:11:42Z", GoVersion:"go1.15.5", Compiler:"gc", Platform:"linux/amd64"}

种类--版本

kind version 0.10.0

Answer 5

在kind config yaml中

containerPort 必须与服务配置中的 'NodePort' 相同。你的情况是 30000

提示：hostPort可以是任意端口，不需要和containerPort

相同

Answer 6

您不应该将节点端口与本地 IP 一起使用。相反，你应该：

使用命令：kubectl get nodes -o wide
记下节点的IP
卷曲：30000

或

docker 执行 -it /bin/bash
卷曲localhost:30000

Answer 7

kubectl port-forward svc/hostname-service 30000:80

现在您的服务将在主机端口 30000 上被访问

如何使用 NodePort 与 kind？

How to use NodePort with kind?

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docker

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