What are the security implications of using managed Kubernetes services in the public cloud?

All answers to this question.

Securing Kubernetes is a top priority in modern Cloud Computing (AWS/Azure/GCP). GKE is generally considered to have the most mature "out-of-the-box" security, especially with Autopilot mode which handles node patching and hardening for you. EKS is incredibly powerful but requires more manual configuration for things like IAM Roles for Service Accounts (IRSA). For secrets, both integrate well with their respective KMS, but GCP's Secret Manager feels a bit more integrated into the Kubernetes native secret objects via their CSI driver. Both are secure, but GKE reduces the "human error" factor significantly.

   Answered 2025-09-21 by Sharon Wood

Have you considered using a service mesh like Istio to handle mutual TLS between your services? It adds a layer of security that managed K8s doesn't provide natively.

   Answered 2025-09-23 by Jeffrey Allen

• Jeffrey, Istio is on our roadmap, but we are worried about the complexity it adds to the networking. We might start with Linkerd for a "lighter" approach to mTLS. Our main focus right now is just ensuring the control plane and data plane are isolated using private endpoints and VPC peering, ensuring that our internal service traffic never touches the public internet during inter-pod communication.

     Commented 2025-09-24 by Matthew Hall

Always enable "Pod Security Admission" controllers. They prevent containers from running as root, which is the most common vulnerability in cluster environments.

   Answered 2025-09-25 by Karen Green

• Simplicity is key, Karen. Preventing root access at the gate is a simple configuration that stops a huge number of potential privilege escalation attacks.

     Commented 2025-09-26 by Sharon Wood