How to Use a Specified Context with Kubernetes Client-Go?

Using kubectl Context in Kubernetes Client-Go

Introduction

The Kubernetes client-go library provides an interface for interacting with Kubernetes from Go applications. It supports using different contexts to connect to multiple Kubernetes clusters. This article explores how to utilize a specified context to configure the client-go for Kubernetes operations.

Code Example with Context Configuration

The code example provided in the question demonstrates how to obtain a client configuration and Kubernetes client for a specified context. However, it initially encountered an issue where the API server was not set correctly, resulting in a connection attempt to the default host localhost:8080.

Solution: Using NewNonInteractiveDeferredLoadingClientConfig

The source code of BuildConfigFromFlags reveals that it essentially calls NewNonInteractiveDeferredLoadingClientConfig with empty parameters. To specify the context, it is necessary to use NewNonInteractiveDeferredLoadingClientConfig directly and provide it with the desired context.

<code class="go">// Create a client config loading rules object to specify the kubeconfig file.
configLoadingRules := &clientcmd.ClientConfigLoadingRules{ExplicitPath: kubeconfig}

// Create a client config overrides object to specify the context.
configOverrides := &clientcmd.ConfigOverrides{CurrentContext: context}

// Use NewNonInteractiveDeferredLoadingClientConfig to get the client config.
kconf, err := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(configLoadingRules, configOverrides).ClientConfig()</code>

By specifying the context in the configOverrides object, the client config will be configured with the correct context, allowing for connections to the desired Kubernetes cluster.

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