Dns

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.

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.

A deep dive into how Kubernetes DNS resolves service names to IP addresses, covering A records, SRV records, search domains, and the full lookup path from pod to CoreDNS. Understanding this lifecycle is essential for debugging connectivity issues and designing resilient microservice architectures.

Kubernetes provides a built-in DNS service that assigns predictable names to Services and Pods within a cluster. By default, pods use cluster.local as their search base for internal DNS resolution, enabling communication through human-readable names rather than ephemeral IP addresses.

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.

An overview of how Docker’s built-in DNS resolver enables container-to-container communication and service discovery. Covers default configurations, custom DNS setups, and practical use cases.