As cloud‑native DevOps shifts more logic into containers, serverless functions, and microservices, traditional perimeter‑based security becomes insufficient. Runtime security focuses on protecting workloads while they are actually running, detecting and blocking malicious behaviour such as unauthorised process execution, unexpected network connections, or suspicious file‑system changes. Security agents embedded in pods, nodes, or cloud‑runtime environments continuously monitor system calls, network flows, and application telemetry, turning anomalies into incidents rather than blind‑spots.
In a DevOps context, runtime‑security tools integrate with CI/CD and orchestration systems so that alerts are tied to specific services, deployments, and teams. Policies can be defined as code and applied consistently across Kubernetes, serverless, and bare‑metal environments, enabling teams to respond quickly with pod isolation, auto‑remediation, or traffic‑control actions. Over time, runtime security complements build‑time and configuration‑level controls, forming a layered defense that keeps cloud‑native applications safe without slowing down delivery.