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Using Cloudflare API to update a DNS A record with Edgerouter DDNS service

All this is already on the internet, and is a mix of several sources, but specially I put it here because of the “server” option, that caused me some headache.

NOTE: the A record (example.domain.com) MUST exists in Cloudflare before setting this. You also need the Global API KEY from Cloudflare.

Asumptioms and clarifications

  • Your internet interface (i.e., the one with your changing public IP address) is eth0. - NOTE: If your ISP provides your service through a VLAN, it may be something like eth0.10. Please verify in the dashboard which interface name you need.
  • Your Cloudflare subdomain is example.domain.com
  • Your Cloudflare zone is domain.com
  • Your Cloudflare username is myuser@cloudflare.com
  • Your Cloudflare Global API KEY is 1234567abcdefg1234567
  • The name we will define for the service in the router is “custom-cloudflare”
  • You know how to connect to your router by SSH

Commands for CLI (SSH)

configure

set service dns dynamic interface eth0 service custom-cloudflare host-name example.domain.com

set service dns dynamic interface eth0 service custom-cloudflare login myuser@cloudflare.com

set service dns dynamic interface eth0 service custom-cloudflare password 1234567abcdefg1234567

set service dns dynamic interface eth0 service custom-cloudflare protocol cloudflare

set service dns dynamic interface eth0 service custom-cloudflare server api.cloudflare.com/client/v4/

set service dns dynamic interface eth0 service custom-cloudflare options "zone=domain.com use=web ssl=yes"

commit

save

Verify status

show dns dynamic status

Force an update

update dns dynamic interface eth0