History

Justin SB 46c8cc6d86 makefile: use more hash helpers when building images It's cleaner & more consistent.		2020-02-16 13:10:31 -05:00
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cmd/dns-controller	makefile: use more hash helpers when building images	2020-02-16 13:10:31 -05:00
docs	fixing up the line length	2017-06-08 11:00:33 +01:00
pkg	Add code simplifications for staticheck	2019-12-30 17:40:24 +02:00
README.md	Typo fix "api server" -> "API server"	2018-11-17 15:13:08 +08:00

README.md

dns-controller

dns-controller creates DNS records.

In the bring-up of a new cluster, protokube has already ensured that we have an etcd cluster and an apiserver. It also sets up DNS records for the etcd nodes (this is a much simpler problem, because we have a 1:1 mapping from an etcd node to a DNS name.)

However, none of the nodes can reach the API server to register. Nor can end-users reach the API. In future we might expose the API server as a normal service via Type=LoadBalancer or via a normal Ingress, but for now we just expose it via DNS.

The dns-controller recognizes annotations on nodes.

dns.alpha.kubernetes.io/external will set up records for accessing the resource externally
dns.alpha.kubernetes.io/internal will set up records for accessing the resource internally

When added on Service controllers:

dns.alpha.kubernetes.io/external creates a Route53 A record with public IPs of all the nodes
dns.alpha.kubernetes.io/internal creates a Route53 A record with private IPs of all the nodes

The syntax is a comma separated list of fully qualified domain names.