无法从集群内部连接到kubernetes API

Question

我试图在本地迷你库集群上的一个简单示例中使用8/kubernetes-客户，在该集群中，我获得了一个荚的IP

import io.fabric8.kubernetes.client.Config;
import io.fabric8.kubernetes.client.ConfigBuilder;
import io.fabric8.kubernetes.client.DefaultKubernetesClient;
import io.fabric8.kubernetes.client.KubernetesClient;

public class PodLogExample {

  public static void main(String[] args) throws InterruptedException {

    String podName = "some-pod-name-jnfen3";
    String namespace = "default";
    String master = "https://localhost:32780/";

    Config config = new ConfigBuilder().withMasterUrl(master).build();
    KubernetesClient client = new DefaultKubernetesClient(config);
    String podIP = client.pods().inNamespace(namespace).withName(podName).get().getStatus().getPodIP();
    System.out.println("Pod IP is: " + podIP);
    Thread.sleep(5 * 1000);
    client.close();
  }
}

some-pod-name-jnfen3是一个已完成执行的荚的名称，如果我执行kubectl get pods，它是可见的。

https://localhost:32780/是我从kubectl config view -o jsonpath="{.clusters[?(@.name==\"minikube\")].cluster.server}"获得的一个kubernetes主机。

• minikube只有一个节点。
• 8 is /kubernetes-客户端版本为4.9.1
• Java 11

我将此代码作为作业部署在与some-pod-name-jnfen3相同的集群上。这是一个例外：

Exception in thread "main" io.fabric8.kubernetes.client.KubernetesClientException: Operation: [get]  for kind: [Pod]  with name: [some-pod-name-jnfen3]  in namespace: [default]  failed.
    at io.fabric8.kubernetes.client.KubernetesClientException.launderThrowable(KubernetesClientException.java:64)
    at io.fabric8.kubernetes.client.KubernetesClientException.launderThrowable(KubernetesClientException.java:72)
    at io.fabric8.kubernetes.client.dsl.base.BaseOperation.getMandatory(BaseOperation.java:225)
    at io.fabric8.kubernetes.client.dsl.base.BaseOperation.get(BaseOperation.java:168)
    at PodLogExample.main(PodLogExample.java:16)
Caused by: java.net.ConnectException: Failed to connect to localhost/127.0.0.1:32780
    at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:249)
    at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:167)
    at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:258)
    at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:135)
    at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:114)
    at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
    at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
    at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
    at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:127)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
    at io.fabric8.kubernetes.client.utils.BackwardsCompatibilityInterceptor.intercept(BackwardsCompatibilityInterceptor.java:134)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
    at io.fabric8.kubernetes.client.utils.ImpersonatorInterceptor.intercept(ImpersonatorInterceptor.java:68)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
    at io.fabric8.kubernetes.client.utils.HttpClientUtils.lambda$createHttpClient$3(HttpClientUtils.java:112)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
    at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:257)
    at okhttp3.RealCall.execute(RealCall.java:93)
    at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:469)
    at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:430)
    at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleGet(OperationSupport.java:395)
    at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleGet(OperationSupport.java:376)
    at io.fabric8.kubernetes.client.dsl.base.BaseOperation.handleGet(BaseOperation.java:845)
    at io.fabric8.kubernetes.client.dsl.base.BaseOperation.getMandatory(BaseOperation.java:214)
    ... 2 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
    at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
    at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
    at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
    at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:403)
    at java.base/java.net.Socket.connect(Socket.java:609)
    at okhttp3.internal.platform.Platform.connectSocket(Platform.java:129)
    at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:247)
    ... 34 more

由于某些原因，它无法连接到kubernetes API主机。

我怎么才能修好它？

更新

如果我不将config传递给客户端，它将获得正确的主IP，然后在以下异常情况下失败

Exception in thread "main" io.fabric8.kubernetes.client.KubernetesClientException: Failure executing: GET at: https://10.96.0.1/api/v1/namespaces/default/pods/some-pod-name-jnfen3. Message: Forbidden!Configured service account doesn't have access. Service account may have been revoked. pods "some-pod-name-jnfen3" is forbidden: User "system:serviceaccount:default:default" cannot get resource "pods" in API group "" in the namespace "default".
    at io.fabric8.kubernetes.client.dsl.base.OperationSupport.requestFailure(OperationSupport.java:568)
    at io.fabric8.kubernetes.client.dsl.base.OperationSupport.assertResponseCode(OperationSupport.java:505)
    at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:471)
    at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:430)
    at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleGet(OperationSupport.java:395)
    at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleGet(OperationSupport.java:376)
    at io.fabric8.kubernetes.client.dsl.base.BaseOperation.handleGet(BaseOperation.java:845)
    at io.fabric8.kubernetes.client.dsl.base.BaseOperation.getMandatory(BaseOperation.java:214)
    at io.fabric8.kubernetes.client.dsl.base.BaseOperation.get(BaseOperation.java:168)
    at PodLogExample.main(PodLogExample.java:17)

Answer 1

kubectl config view -o jsonpath="{.clusters[?(@.name==\"minikube\")].cluster.server}"返回相对IP。这对于Pod来说是不一样的。

不通过config将使库找到正确的IP。

另外，应该在job.yaml中创建和设置一个新的服务帐户。

default服务帐户没有获取k8s实体的权限。

相关GitHub问题

Answer 2

从笔记本电脑的角度来看，它是本地主机，而从集群内部看，它不是本地主机。使用InClusterConfig帮助器代替。