Kubernetes has become the de facto standard for container orchestration, but its flexibility and complexity create significant security challenges. Default Kubernetes configurations are designed for ease of use, not security, making hardening essential before deploying production workloads.
RBAC (Role-Based Access Control) is the foundation of Kubernetes security. Every service account, user, and application should operate with the minimum permissions necessary. Avoid using cluster-admin roles except where absolutely required, and regularly audit RBAC configurations for privilege creep.
Network Policies act as firewalls within the cluster, controlling traffic flow between pods. By default, Kubernetes allows all pod-to-pod communication, which means a compromised pod can communicate with any other pod in the cluster. Implementing deny-all default policies and explicitly allowing only required traffic paths is essential.
Pod Security Standards (PSS) replace the deprecated PodSecurityPolicies and define three progressive security levels: Privileged, Baseline, and Restricted. Production workloads should target the Restricted profile, which prevents containers from running as root, limits capabilities, and enforces read-only root filesystems.
Image security encompasses scanning images for vulnerabilities, signing images to ensure integrity, and using admission controllers to enforce image policies. Tools like Trivy, Falco, and Kyverno integrate seamlessly with Kubernetes to automate these checks.
Secrets management in Kubernetes requires special attention. Native Kubernetes secrets are base64-encoded, not encrypted, and stored in etcd. External secret management solutions like Sealed Secrets, External Secrets Operator, or direct integration with vault solutions provide much stronger protection for sensitive data.
Austar DevOps Team
February 22, 2026