Technology

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.

An overview of the AWS EC2 Instance Metadata Service (IMDS), including its link-local address and the difference between IMDSv1 and IMDSv2 access.

A practical cheat sheet for managing firewalld on RHEL, Fedora, and CentOS systems. Covers zones, services, ports, rich rules, NAT, and direct iptables-style rules.

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.

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

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.