Dynamic DNS script for DigitalOcean. For example: to use with OpenWRT routers, install bash (opkg install bash) then place this script in /etc/hotplug.d/iface/

digitalocean-dyndns

#!/usr/bin/env bash
set -x

# Domain you wish to update
DOMAIN="example.com"

# Get the v4/v6 addresses from icanhazip.com [pretty reliable!]
IPV4_ADDR=`wget -4 -q -O - icanhazip.com`
IPV6_ADDR=`wget -6 -q -O - icanhazip.com`

# Get your v2 API token from here: https://cloud.digitalocean.com/settings/tokens/new
TOKEN="..."

# Add the record IDs you wish to update here
V4_RECORDS=(123 ...)
V6_RECORDS=(678 ...)

for RECORD in $V4_RECORDS
do
  wget \
    -O - \
    --quiet \
    --no-check-certificate \
    --method="PUT" \
    --header="Content-Type: application/json" \
    --header="Authorization: Bearer $TOKEN" \
    --body-data="{\"data\":\"$IPV4_ADDR\"}" "https://api.digitalocean.com/v2/domains/$DOMAIN/records/$RECORD"
done

for RECORD in $V6_RECORDS
do
  wget \
    -O - \
    --quiet \
    --no-check-certificate \
    --method="PUT" \
    --header="Content-Type: application/json" \
    --header="Authorization: Bearer $TOKEN" \
    --body-data="{\"data\":\"$IPV6_ADDR\"}" "https://api.digitalocean.com/v2/domains/$DOMAIN/records/$RECORD"
done

Really nice script, it helped me to bootstrap mine 😄

A few suggestions if I may:

Lines 8-9:

• instead of passing -4 and -6 to wget you can query explicitly ipv4.icanhazip.com and ipv6.icanhazip.com respectively.
• use https:// for extra bit of security

Lines 14-16:

• please add an explanation where to get those ids. GET on https://api.digitalocean.com/v2/domains/$DOMAIN_NAME/records should return them.

Lines 23 and 35:

• why --no-check-certificate? DigitalOcean returns valid certificate and by skipping the check you're downgrading security of your connection.