Accessing the Kubernetes API from a Pod

Radha_Gupta · August 14, 2023, 11:58am

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Cluster information:

Kubernetes version: Google Managed
Cloud being used: Google Kubernetes Engine
Installation method:
Host OS:
CNI and version:
CRI and version:

Hello,

I am trying to access to Kubernetes API from a Pod using Java Client library. I have followed in cluster config example from below URL:

github.com

kubernetes-client/java/blob/master/examples/examples-release-18/src/main/java/io/kubernetes/client/examples/InClusterClientExample.java

/*
Copyright 2020 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package io.kubernetes.client.examples;

import io.kubernetes.client.openapi.ApiClient;
import io.kubernetes.client.openapi.ApiException;
import io.kubernetes.client.openapi.Configuration;
import io.kubernetes.client.openapi.apis.CoreV1Api;
import io.kubernetes.client.openapi.models.V1Pod;
import io.kubernetes.client.openapi.models.V1PodList;

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I am able to run it successfully locally but when I deploy it in GCP Kubernetes, and trying to invoke the service from within a pod, it is not working and giving below error:
org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver [http-nio-8080-exec-1] Resolved [java.nio.file.NoSuchFileException: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt

I tried to find locate the certificate in ‘/var/run/secrets/kubernetes.io/serviceaccount’ path within pod, but it’s not available and that is why I am getting this error.

Could you please help to understand what is wrong with that.

Thanks

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Accessing the Kubernetes API from a Pod

Cluster information:

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