> ## Documentation Index > Fetch the complete documentation index at: https://docs.fly.io/llms.txt > Use this file to discover all available pages before exploring further. # Fly Kubernetes features Illustration by Annie Ruygt of a ship's wheel Fly Kubernetes benefits from the features of the Fly.io platform. ## Fly.io infrastructure FKS is built on top of Fly.io infrastructure: * Compute is backed by [Fly Machines](/machines), our fast-launching VMs built with Firecracker. * Volumes are handled with [Fly Volumes](/volumes); local, fast NVMe drives. * Networking is built on our [internal WireGuard mesh](/networking/private-networking#private-network-vpn) with routing performed by Fly Proxy. ## Cluster scalability Pods are scheduled across our fleet of bare-metal servers, not limited to a specific node. Workloads are automatically distributed across the fleet, enabling a cluster to scale with ease. ## Security With Fly Kubernetes, you get all the security benefits of our platform. * Private network traffic flows over our internal WireGuard mesh, ensuring it is encrypted. * FKS clusters are secured within a private VPN. * Compute is built on Firecracker microVMs — lightweight and secure virtual machines. This provides improved isolation guarantees ensuring your application code is safe. * Volumes are encrypted at rest for additional protection of the data on the volume. * Secrets are automatically stored in an encrypted vault. ## Simple and secure client authentication Connect to your cluster using kubectl. Clients are authenticated with our API tokens. They expire after an hour and are rotated automatically after expiration. ## Not supported There are a few features we don't support yet but are part of the roadmap: * Sidecars and init processes * EmptyDir volumes * Horizontal pod autoscaling * Network policies * CronJob Features we don't support: * Node affinity * Inter-pod (anti) affinity * DaemonSets ## Pricing See the [pricing page](/about/pricing#fly-kubernetes) for information on FKS pricing.