Use Route53 for dynamic DNS.

Reads record name and zone from a YAML config and upserts on schedule.

go get
go build

The config file should have a source endpoint and each record to be updated:

source: "https://api.ipify.org?format=text"

records:
- cron: "@hourly"
  name: home.example.com.
  ttl: 300
  zone: Z1ABCDEF123456
- cron: "@daily"
  name: office.example.com.
  ttl: 86400
  zone: Z1ABCDEF123456

Execute with the config file:

AWS_PROFILE="home-root" ./home-dns config.yml

I do not know Go very well at all, so this code may be quite bad.

• multiple zones and records
• update on cron schedule

• cache the external address (on a schedule of its own?)
• interface selection for external check