Hardening Kubernetes in Production: Zero-Trust Security Practices for GKE Deployments

Implementing zero-trust security principles at the container level—through read-only filesystems and restrictive security contexts—prevents attackers from exploiting RCE vulnerabilities to deploy malware, escalate privileges, or modify application behavior. This practical approach makes Kubernetes the enforcement mechanism itself, automatically rejecting unauthorized runtime changes regardless of whether application code is compromised. Combined with immutable infrastructure and automated CI/CD pipelines, these hardening techniques create genuinely resilient production systems that require minimal runtime trust decisions.