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Kubernetes Virtualization with KubeVirt

2 posts · Jul 2021 – Oct 2024

What this trail covers

Cloudflare is leveraging KubeVirt to run virtual machines alongside containerized workloads within its multi-tenant Kubernetes clusters. This enables teams requiring deep integration with the Linux kernel, such as for build infrastructure and network simulation, to do so securely and efficiently. KubeVirt integrates with Kubernetes primitives and CRDs, allowing for scalable VM deployment and management. Use cases include Kubernetes scalability testing, development environments, kernel and iPXE testing, and build pipelines.

All Cloudflare trails
  1. Leveraging Kubernetes virtual machines at Cloudflare with KubeVirtThis post details Cloudflare's adoption and use of KubeVirt for running virtual machines within their multi-tenant Kubernetes clusters. It explains the need for virtualization to allow workloads tight integration with the Linux kernel without compromising multi-tenancy security. The post outlines the setup process for virtualized Kubernetes clusters using Ansible and kubeadm for scalability testing, including simulating network failures to test Kubernetes' resilience. It also touches on using KubeVirt for development environments and kernel/iPXE testing.
  2. Automatic Remediation of Kubernetes NodesThis post details the development and implementation of Sciuro, an open-source tool designed to automate the remediation of unhealthy Kubernetes nodes in a self-managed bare-metal environment. Sciuro synchronizes Kubernetes node conditions with alerts from Alertmanager, enabling automated actions like node reboots for issues such as excessive CNI network interfaces. The post also discusses the limitations of existing solutions like Node Problem Detector and the rationale behind building a custom solution.