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Securing a CoreOS Cluster

"Coreos-wordmark-horiz-color" by Rob Szumski - Own work. Licensed under CC BY-SA 3.0 via Commons - https://commons.wikimedia.org/wiki/File:Coreos-wordmark-horiz-color.png#/media/File:Coreos-wordmark-horiz-color.png

If you are planning to run a CoreOS cluster in a network environment outside of your control, such as within a shared datacenter or across the public internet, you may have noticed that etcd communicates by making unencrypted HTTP requests. It’s possible to mitigate the risks of that behavior by configuring an IPTables firewall on each node in the cluster, but a complete solution would ideally use an encrypted transport layer.

Fortunately, etcd supports peer-to-peer TLS/SSL connections, so that each member of a cluster is authenticated and all communication is encrypted. In this guide, we’ll begin by provisioning a simple cluster with three members, then configure HTTPS endpoints and a basic firewall on each machine.

If you are looking to deploy a CoreOS cluster, check out brennen‘s first tutorial for digital ocean!


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