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@voxxit
Last active July 14, 2019 12:45
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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/
#!/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
@yurymik
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yurymik commented Jun 6, 2018

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.

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