update_cloudflare_ssh_dns.sh

#!/bin/sh

cloudflare_email='your sign-in email'
cloudflare_apikey='your api key'
cloudflare_dns_record='your dns record'
cloudflare_zone_id='your dns zone id on cloudflare'
cloudflare_dns_record_id='your dns record id under the zone'

data_string=$( jq -n \
--arg ip "$(curl --silent ipecho.net/plain)" \
--arg nm "$cloudflare_dns_record" \
--arg ty 'A' \
--arg co 'dns record' \
'{content: $ip, name: $nm, proxied: false, type: $ty, comment: $co, ttl: 3600}' )

curl --silent --request PUT \
  --url "https://api.cloudflare.com/client/v4/zones/$cloudflare_zone_id/dns_records/$cloudflare_dns_record_id" \
  --header 'Content-Type: application/json' \
  --header "X-Auth-Email: $cloudflare_email" \
  --header "X-Auth-Key: $cloudflare_apikey" \
  --data "$data_string" \
  | jq