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Understanding UMA and Keycloak

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  Introduction In this article, we demystify  User-Managed Access (UMA)  and explain how it is implemented in  Keycloak . UMA introduces a powerful authorization paradigm that moves fine-grained access control out of applications and into a centralized authorization server. UMA is especially useful in modern distributed systems, APIs, and microservice architectures where resource ownership and dynamic permission delegation are required. What is UMA? UMA (User-Managed Access)  is an authorization framework built on top of  OAuth 2.0 . It defines a mechanism that allows a client, acting on behalf of a  requesting party , to obtain authorization  after  a resource owner explicitly grants access - often asynchronously. In simple terms: Users decide who can access their resources, and under which conditions. Key characteristics: Built on OAuth 2.0 Fine-grained, resource-based authorization Asynchronous approval workflow Centralized authorization l...
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Understanding Labels and Selectors in Kubernetes

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  Introduction Labels and selectors are a  fundamental concept in Kubernetes . They provide a flexible, scalable, and loosely coupled way to  identify, group, and operate on resources . While they may look simple at first, they are one of the most powerful mechanisms Kubernetes offers for organizing workloads and connecting components. In this section, we will take a deeper look at  what labels and selectors are ,  how they work , and  why Kubernetes relies on them so heavily . What Are Labels? Labels are  key–value pairs  that you can attach to Kubernetes objects. Almost every Kubernetes object supports labels, including: Pods Nodes Services Deployments ReplicaSets Jobs Labels live under the  metadata  section of an object definition. metadata: labels: app: color-api environment: dev tier: backend release: stable Purpose of Labels Labels provide  descriptive metadata  that helps: Identify resources Organize...
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