Cloud computing delivers on-demand computing resources over the internet, driving modern infrastructure with unparalleled scalability, cost-efficiency, and adaptability. Moreover, Kubernetes has become the de facto standard for cloud orchestration tool for this paradigm, automating the deployment and administration of containerized applications across clusters. This dynamic, multi-tenant environment enables shared resources across various users, teams, and microservices. However, it poses security vulnerabilities if permissions are improperly managed. Consequently, granular access control is essential, ensuring tenant isolation while maintaining the operational advantages of Kubernetes. The goal of this thesis is to present an in-depth comparative analysis of Kubernetes authorization mechanisms for fine-grained access control.