UniFi OS now supports Cloudflare DDNS natively! Use that instead.

UniFi DDNS for Cloudflare via AWS Lambda

UniFi DDNS doesn't support Cloudflare in the UI. This repo is a proxy to fwd UniFi DDNS updates to Cloudflare.
With typical usage, free tier should be plenty.

1. Prepare Cloudflare

1. Find your API key:
   • https://dash.cloudflare.com/profile/api-tokens > Global API Key
2. Find domain zone id:
   • domain's Overview page, right sidebar, Zone ID value
3. Find DNS record id:
   • add/edit an A record with a temporary ip, ie home.mydomain.com=127.0.0.1
   • navigate cloudflare dashboard > Manage Account > Audit Log
   • expand most recent log, copy the Resource ID value

2. Get zip package for AWS

1. Download cloudflare-ddns.zip from https://github.com/frifox/cloudflare-ddns/releases
2. Or build it yourself:

git clone github.com/frifox/cloudflare-ddns
cd cloudflare-ddns
GOOS=linux GOARCH=arm64 go build -o bootstrap -tags lambda.norpc -ldflags "-s -w"
zip cloudflare-ddns.zip bootstrap

3. Create AWS Lambda

1. Goto AWS Lambda (https://console.aws.amazon.com/lambda/home)
2. Click Create Function:
   • select Author from scratch
   • name your function, ie cloudflare-ddns
   • set Runtime Amazon Linux 2023
   • set Architecture arm64
   • under Advanced settings:
     • check Enable function URL
     • set Auth Type NONE
   • Create function
3. Under Code tab:
   • Upload from > .zip file > Upload
   • find your cloudflare-ddns.zip
   • Save
4. Under Configuration tab:
   • Function URL > copy the url, will be used in UniFi later

4. Config your lambda func via ENV

1. Under Configuration tab
   • Environment variables > Edit > Add environment variable
   • add Key/Values:
     • APP_USER = pick a username for your lambda app
     • APP_PASS = pick a password for your lambda app
     • CF_EMAIL = login email for cloudflare
     • CF_KEY = cloudflare global api key
     • CF_ZONE_ID = cloudflare domain's zone id
     • CF_RECORD_ID = cloudflare domain's A record id
   • and optionally:
     • CF_RECORD_PROXIED = use cloudflare proxy true / false (default false)
     • CF_RECORD_TTL = record TTL in seconds, requires CF_RECORD_PROXIED=false (default 3600)

5. Config Unifi

1. Go to https://unifi.ui.com/ > Your console
2. Go to Settings > Internet > Primary (or Secondary)
3. Under Dynamic DNS, click Create New Dynamic DNS:
   • Service = custom
   • Hostname = your FQDN, iehome.mydomain.com
   • Username = APP_USER value
   • Password = APP_PASS value
   • Server = {your_aws_lambda_function_url.aws}/?hostname=%h&ip=%i
     • IMPORTANT: remove the https:// prefix from your aws lambda function url
   • Save

6. Force DDNS to update now

1. Go to https://unifi.ui.com/ > Your console
2. Go to UniFi Devices > your router/gateway > on right sidebar: Settings > Debug
3. Once you get the shell, find inadyn conf file location & force it to update:

# ps x | grep inadyn.conf
2668706 ?        S<     0:00 /usr/sbin/inadyn -n -s -C -f /run/ddns-ppp0-inadyn.conf

# inadyn -n -1 --force -f /run/ddns-ppp0-inadyn.conf
inadyn[2908558]: In-a-dyn version 2.9.1 -- Dynamic DNS update client.
inadyn[2908558]: Update forced for alias home.mydomain.com, new IP# 123.123.123.123
inadyn[2908558]: Updating cache for home.mydomain.com

4. Login to cloudflare and verify dns record updated