Kubernetes

Enables kubelet TLS bootstrapping so the controller-manager issues proper serving certificates, resolving the x509 certificate validation error in metrics-server. Covers deployment edits, controller-manager configuration, and automated certificate renewal.

A guide to building a Kubernetes cluster manually, component by component, without kubeadm or minikube. This approach provides a deep understanding of how Kubernetes works under the hood and prepares you for both certification exams and day-to-day operations.

Catalogs the active Flannel CNI configuration and the full set of 19 available CNI plugin binaries on a Kubernetes node. Provides file sizes, modification dates, and the purpose of each installed plugin.

Clarifies which CNI plugins are acceptable for the CKA exam and explains why the official Kubernetes documentation avoids vendor-specific deployment commands.

Set up a dedicated server as a DNS server using CoreDNS, covering binary installation, server startup, and IP-to-hostname mapping via the hosts plugin. CoreDNS also supports extensibility through plugins, including one for Kubernetes.

Gateway API is a Kubernetes add-on that provides dynamic infrastructure provisioning and advanced traffic routing through an extensible, role-oriented configuration mechanism. It organizes traffic handling around three stable API kinds: GatewayClass, Gateway, and HTTPRoute.