CoreDNS, with John Belamaric

In a world where pods (and IP addresses) come and go, DNS is a critical component. John Belamaric is a Senior SWE at Google, a co-chair of Kubernetes SIG Architecture, a Core Maintainer of the CoreDNS project and author of the O’Reilly Media book Learning CoreDNS: Configuring DNS for Cloud Native Environments. He joins Craig and Adam to discuss CoreDNS, the evolution of DNS in Kubernetes, and how name resolution has been made more reliable in recent releases.

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Chatter of the week

• Death of George Floyd
• SpaceX Crew Demo 2 launch
• Sunniest Spring on record in the UK
• A small test rocket launch in Scotland
• UK spaceport (proposed)
• New Zealand spaceport (active)

News of the week

• Priyanka Sharma replaces Dan Kohn at the CNCF
  • Episode 35, with Dan Kohn
• Starboard, by Aqua Security
  • Episode 19, with Liz Rice
• Docker Enterprise 3.1 from Mirantis
• Docker and Microsoft; Microsoft and Docker
• Velero v1.4
• Agones v1.6
  • Episode 26, with Mark Mandel and Cyril Tovena
• Chef adds Windows container migration for GKE
• Red Hat adds Quarkus to Red Hat Runtimes
• AWS encrypts Fargate ephemeral disks in v1.4
• PlanetScale open sources a Vitess operator
  • Episode 81, with Jiten Vaidya and Sugu Sougoumarane
• Kubernetes provider for Hashicorp Terraform
• Google Vulnerability Reporting Program adds GKE
• Tools for debugging apps on Google Kubernetes Engine by Charles Baer and Xiang Shen
• How Migrate for Anthos helps modernize Java apps
• Helm project journey report
  • Episode 102, with Matt Butcher
  • Helm 3: the Good, the Bad and the Ugly by Sandor Guba of BanzaiCloud
• NIST deployment guidelines for proxy-based Service Mesh by Ramaswamy Chandramouli of NIST and Zack Butcher of Tetrate
• The World of kubectl Plugins: a YouTube series by Ahmet Alp Balkan
  • Episode 66, with Ahmet Alp Balkan and Luk Burchard

Links from the interview

• Domain Name System
  • Root zone
  • Authoritative name server
  • Recursive and caching name server
• Infoblox
• Kubernetes Service
  • DNS for Serivices and Pods
  • Customizing DNS for Kubernetes
• CoreDNS; the default DNS server for Kubernetes since 1.11
  • Introduction slides
  • KEP for CoreDNS in Kubernetes
• SkyDNS
• Miek Gieben; author of CoreDNS and SkyDNS version 2
• Caddy: the HTTP server upon which CoreDNS is based
• Dnsmasq
• CoreDNS plugins
  • Rewriting DNS with CoreDNS
  • redisc plugin: enables a networked cache using Redis
  • ens plugin: serve DNS records from Ethereum Name Service
• Node Local DNS cache and KEP
• BIND
• Unbound DNS resolver
• Explanatory blog posts:
  • Understanding ndots in Kubernetes
  • Racy conntrack and DNS lookup timeouts
• Learning CoreDNS: Configuring DNS for Cloud Native Environments by John Belamaric and Cricket Liu
  • Cricket Liu and his books
  • Book cover: a Comber fish
• Policy integration
  • Episode 101, with Tim Hinrichs and Torin Sandall
  • CoreDNS policy plugin
  • coredns-opa
• SIG Architecture
  • Production Readiness Review and KEP
• A DNS haiku
• John Belamaric on Twitter