SysAdmin

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.

Explains how the rewrite-target annotation in the NGINX Ingress controller maps user-facing URL paths to backend services, preventing 404 errors. Includes examples of simple and regex-based rewrites.

A guide to the ip link show type and ip address show type commands in Linux for filtering network interfaces by type. Covers physical, virtual, and tunneling interface types with practical examples.

Network namespaces provide the foundation for container network isolation in Docker and Kubernetes. This guide covers listing, creating, and linking namespaces, bridging, NAT, and how Docker and Kubernetes build on these primitives.

A practical guide to installing and configuring the Ingress-Nginx Controller in Kubernetes, covering Helm and kubectl methods, cloud-provider annotations, and local testing workflows.

This guide explains how Persistent Volumes and Persistent Volume Claims work together in Kubernetes and shows how to reference a PVC inside a Pod definition. It also covers access modes and the difference between static and dynamic provisioning.