https://miek.nl/tags/9.9.9.9/ Recent content in 9.9.9.9 on Miek Gieben Hugo en-us © Copyright 2007-2024 Miek Gieben Sat, 13 Jan 2018 10:38:37 +0000 https://miek.nl/2018/january/13/running-coredns-as-a-forwarder-in-kubernetes/ Sat, 13 Jan 2018 10:38:37 +0000 https://miek.nl/2018/january/13/running-coredns-as-a-forwarder-in-kubernetes/ <p>This post details how I got CoreDNS running as a forwarder in a <a href="https://k8s.io">Kubernetes</a> cluster. There were several problems that stood in the way of this goal:</p> <ol> <li>Having (and building) a cluster out of Raspberry PIs.</li> <li>Making load balancing possible in a non-cloud environment. <ul> <li>See <a href="https://github.com/google/metallb">https://github.com/google/metallb</a>.</li> </ul> </li> <li>Extending CoreDNS with a plugin that could communicate with 9.9.9.9 using <a href="https://tools.ietf.org/html/rfc7858">DNS-over-TLS</a>. <ul> <li>See <a href="https://github.com/coredns/forward">https://github.com/coredns/forward</a>.</li> </ul> </li> <li>Building arm docker containers on amd64. <ul> <li>See <a href="https://github.com/miekg/dxbuild">https://github.com/miekg/dxbuild</a>.</li> </ul> </li> <li>Having a (simple) CI system to build (Docker) images and version the k8s manifests. <ul> <li>No published repository, see various gists referenced in this document.</li> </ul> </li> </ol> <h2 id="cluster">Cluster</h2> <p>I bought 4 PIs, some nice Corkea cases, an Anker USB power supply and power- and network cables. Then it is just a matter if putting everything together and building the cluster.</p>