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docker - minikube ip 返回 127.0.0.1 | Kubernetes NodePort 服务无法访问

问题描述

我有两个 Kubernetes 对象，

apiVersion: v1
kind: Pod
metadata:
  name: client-pod
  labels:
    component: web
spec:
  containers:
  - name: client
    image: stephengrider/multi-client
    resources:
      limits:
        memory: "128Mi"
        cpu: "500m"
    ports:
      - containerPort: 3000

apiVersion: v1
kind: Service
metadata:
  name: client-node-port
spec:
  type: NodePort
  selector:
    component: web
  ports:
  - port: 3050
    targetPort: 3000
    nodePort: 31515

之后我都使用kubectl apply -f <file_name>了，这是输出

kubectl get services
NAME                  TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
client-node-port      NodePort    10.100.230.224   <none>        3050:31515/TCP   30m

吊舱输出

NAME                                  READY   STATUS    RESTARTS   AGE
client-pod                            1/1     Running   0          28m

但是当我运行minikube ip它返回 127.0.0.1 时，我正在使用带有 docker 驱动程序的 minikube。

关注此问题后https://github.com/kubernetes/minikube/issues/7344。我得到了节点IP使用

kubectl get node -o json |
        jq --raw-output \
          '.items[0].status.addresses[]
            | select(.type == "InternalIP")
              .address
          '

但即便如此，我也无法访问该服务。经过更多搜索，我发现

minikube service --url client-node-port
  Starting tunnel for service client-node-port.
|-----------|------------------|-------------|------------------------|
| NAMESPACE |       NAME       | TARGET PORT |          URL           |
|-----------|------------------|-------------|------------------------|
| default   | client-node-port |             | http://127.0.0.1:52694 |
|-----------|------------------|-------------|------------------------|
http://127.0.0.1:52694
❗  Because you are using a Docker driver on darwin, the terminal needs to be open to run it.

我可以使用 minikube 服务访问该服务。

问题：

  1. 但我想知道为什么暴露的 nodePort 不起作用？
  2. 为什么我要使用此解决方法来访问该应用程序。

更多信息：

minikube version
minikube version: v1.10.1
commit: 63ab801ac27e5742ae442ce36dff7877dcccb278

docker version
Client: Docker Engine - Community
 Version:           19.03.8
 API version:       1.40
 Go version:        go1.12.17
 Git commit:        afacb8b
 Built:             Wed Mar 11 01:21:11 2020
 OS/Arch:           darwin/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.8
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.12.17
  Git commit:       afacb8b
  Built:            Wed Mar 11 01:29:16 2020
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          v1.2.13
  GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

kubectl version
Client Version: version.Info{Major:"1", Minor:"16+", GitVersion:"v1.16.6-beta.0", GitCommit:"e7f962ba86f4ce7033828210ca3556393c377bcc", GitTreeState:"clean", BuildDate:"2020-01-15T08:26:26Z", GoVersion:"go1.13.5", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.2", GitCommit:"52c56ce7a8272c798dbc29846288d7cd9fbae032", GitTreeState:"clean", BuildDate:"2020-04-16T11:48:36Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}

如果您需要更多信息，我愿意提供。

minikube ssh

docker@minikube:~$ ip -4 a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
4: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    inet 172.18.0.1/16 brd 172.18.255.255 scope global docker0
       valid_lft forever preferred_lft forever
945: eth0@if946: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default  link-netnsid 0
    inet 172.17.0.2/16 brd 172.17.255.255 scope global eth0
       valid_lft forever preferred_lft forever

标签： dockerkubernetesminikube

解决方案

我有同样的问题。问题不在于 IP 127.0.0.1。问题是我正在调用我在YAML文件中为NodePort. 看起来minikube将为外部访问分配一个不同的端口。

我这样做的方式：

  • 在格式良好的表格中列出所有服务： 
    $minikube service list
  • 显示 IP 和外部端口： 
    $minikube service Type-Your-Service-Name

如果您这样做，minikube将打开浏览器并运行您的应用程序。

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