Networking

Explains how the AWS default DNS server works for EC2 instances within a VPC, including the special 169.254.169.253 address and the CIDR-based resolver IP.

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.

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.

An overview of Kubernetes Ingress resources and the controllers that fulfill them, covering terminology, creation, and prerequisites.

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.