Scalable user authentication for Kubernetes clusters with OpenID Connector

The guide provides a comprehensive, real-world approach to setting up federated identity using OpenID Connect (OIDC) across managed Kubernetes clusters such as AWS and Google Cloud Platform with various identity providers, including Okta, Microsoft Entra ID, Google Workspace, and JumpCloud. The text underscores the scalability benefits of OIDC by centralizing user provisioning and reducing the need for individual user certificates in Kubernetes clusters. It details the configuration processes for each identity provider, emphasizing the security advantages of using PKCE in the OAuth 2.0 protocol, and provides specific instructions for setting up each provider with Kubernetes. The document also elaborates on the different OAuth flows used for authentication, explains the concept of claims in the context of Kubernetes, and covers the necessary configurations on both the identity provider and Kubernetes cluster sides to achieve seamless integration. Additionally, it offers troubleshooting tips and a step-by-step manual execution of the PKCE flow for verification purposes.

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