As cloud-native architectures grow, managing identity across dozens of microservices becomes a critical challenge. Traditional approaches often lead to fragmented authentication, with each service implementing its own auth logic or adapting open-source IAM systems with heavy customization. This article examines the landscape of IAM solutions, from frameworks like Sa-Token to full-fledged open-source IAM platforms, and discusses how to design a centralized multi-level SSO system that scales across organizational boundaries. Key considerations include balancing flexibility with security, handling cross-domain authentication, and integrating legacy systems. The post provides a structured way to think about IAM architecture, making it a useful reference for platform engineers planning their identity infrastructure. As security requirements tighten, having a coherent IAM strategy becomes a competitive advantage.
An architectural deep dive into building centralized, multi-level IAM/SSO systems for cloud-native environments, comparing existing solutions and integration strategies.