Security Best Practices for Vultr Kubernetes Engine (VKE)

Vultr Kubernetes Engine (VKE) is a managed service that makes it easy to run Kubernetes clusters on Vultr's cloud. It handles the main parts like the control plane and lets you focus on your apps. Security in VKE protects your cluster from risks like unwanted access or data leaks by using tools for control, network rules, and updates.

This guide provides practical recommendations and best practices to secure your Vultr Kubernetes Engine (VKE) cluster.

Secure Access to the Cluster

Role-Based Access Control (RBAC) limits what users and apps can do in the cluster to lower risks. In VKE, turn on RBAC when you create the cluster or check it with kubectl get clusterrolebindings. Make roles that give only needed permissions, like view-only access for devs in certain areas. See the Kubernetes RBAC docs for more.

To share access to your VKE cluster, always create a new user via the token-based method or the Kubernetes Certificate Signing Request (CSR) method. Never share the primary kubeconfig file, as it provides administrative access and cannot be revoked. For the token-based method, create a service account using kubectl create serviceaccount test-user and provide its token for limited access. For the CSR method, generate a key pair, create a signing request, and approve it to issue a certificate. These methods allow you to revoke access when necessary. See the Kubernetes service accounts docs and certificate signing requests docs for details.

VKE allows you to integrate with external identity providers using OpenID Connect (OIDC). This approach enables integration with tools like Okta for secure sign-ins, leveraging features like multi-factor authentication (MFA) and short-lived access tokens. This avoids the need to share static kubeconfig files. Follow Vultr's guide to connect Okta OIDC with Vultr Kubernetes Engine.

Turn On High Availability

VKE offers high availability for the control plane, spreading key parts across nodes to avoid full stops if one fails. Turn this on when you make the cluster in the Vultr panel. It keeps your apps running during high worlkoad hours and gives more resiliency to your apps. Check the Vultr Docs for enabling High Availability on VKE for the exact steps.

Upgrade the Cluster

Upgrading a Vultr Kubernetes Engine (VKE) cluster version involves updating the control plane to a newer Kubernetes version. This ensures that your cluster benefits from the latest features, improvements, and security patches. For step-by-step instructions, see the VKE cluster upgrade guide.

Store Secrets Safely

Avoid storing sensitive data like passwords or API keys in plain text within your Pod definitions. Instead, use Kubernetes Secrets to manage this information. While Secrets separate your sensitive data from your application code, they are only Base64 encoded by default, not encrypted. For true security, you must enable encryption for secrets at rest when you create your cluster in the Vultr control panel. For more, see the Kubernetes Secrets documentation and Encrypting Confidential Data at Rest article.

Apply Pod Security Rules

Pod Security Standards define three policies - Privileged, Baseline, and Restricted - to prevent insecure container configurations, such as running as the root user. Apply the Restricted standard whenever possible and use admission controllers to enforce these policies, automatically blocking insecure workloads from being deployed. This helps prevent compromised or misconfigured Pods from causing damage. For more details, see the Kubernetes pod security standards docs.

Monitor Cluster Actions

Implement monitoring and logging solutions like Prometheus and Grafana to detect unusual activity or performance issues in your VKE cluster. These tools help you track metrics, identify resource bottlenecks, and ensure workload health. For setup instructions, see the Prometheus getting started guide and Grafana dashboard best practices.

Secure External Service Exposure

Use an Ingress controller with TLS encryption to expose services securely, instead of using LoadBalancer services directly. Set up controllers like Nginx or Traefik to manage traffic and provision SSL/TLS certificates for encrypted connections.

When you deploy an Ingress controller, VKE automatically provisions a Vultr Load Balancer to route external traffic. Apply Vultr Firewall rules to the load balancer to control access. In your Ingress manifest, use annotations to configure security headers, such as Content-Security-Policy (CSP).

For setup details, see the articles on Nginx Ingress with SSL on Kubernetes and Traefik Ingress with Cert-Manager on Kubernetes. Also check the Vultr Load Balancer docs.

Conclusion

Implementing these security best practices ensures your VKE Cluster remains protected from security threats, and is reliable. For more details, visit the Vultr Kubernetes Engine docs and Kubernetes security concepts.