Implementing Pod Security Admission Controller

Overview

Pod Security Admission (PSA) is a built-in Kubernetes admission controller (stable since v1.25) that enforces Pod Security Standards at the namespace level. It replaces the deprecated PodSecurityPolicy (PSP) and provides three security profiles: Privileged, Baseline, and Restricted, with three enforcement modes: enforce, audit, and warn.

When to Use

• When deploying or configuring implementing pod security admission controller capabilities in your environment
• When establishing security controls aligned to compliance requirements
• When building or improving security architecture for this domain
• When conducting security assessments that require this implementation

Prerequisites

• Kubernetes v1.25+ (PSA is stable/GA)
• kubectl with cluster-admin access
• No dependency on external tools - PSA is built into kube-apiserver