java - 无法从集群内部连接到 kubernetes API

Question

我正在尝试使用 fabric8io/kubernetes-client在我本地 minikube 上的一个简单示例中我在其中获取 pod 的 IP 的集群

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 是执行完毕的 pod 的名称，如果我执行 kubectl get pods 就可见。

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

• minikube 只有 1 个节点。
• fabric8io/kubernetes-client 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。这是异常(exception):

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

由于某种原因，它无法连接到 kubernetes API 主机。

我该如何解决？

更新

如果我不将 config 传递给客户端，它会获得正确的主 IP，然后失败并出现以下异常

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。 Pod 则不同。

不传递 config 将使库找到正确的 IP。

还应在 job.yaml 中创建并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。

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