Azure DNS Updater

Azure Dynamic DNS updater based on Python (Docker Included)

Based on AzureDynDns by @evkapsal

Requirements

Microsoft Azure Portal:

• Create an App Service Domain.
• Activate DNS Zone for that domain.
• Create all DNS Record Sets you need to be updated (recommend to set the current server IP as value).

From this page, you could get.

• SUBSCRIPTION_ID: 38926cdc-fcb2-4e67-bed8-8e619ab2d5a4.
• DOMAIN: foo.com.
• RESOURCE_GROUP: default-web-northeurope.
• RECORD_SET: *,@.

In Azure Cloud Shell execute:

$ az ad sp create-for-rbac -n "azure-dns-updater" --scopes /subscriptions/{SUBSCRIPTION_ID}/resourceGroups/{RESOURCE_GROUP}/providers/Microsoft.Network/dnszones/{DOMAIN}

Example:

$ az ad sp create-for-rbac -n "azure-dns-updater" --scopes /subscriptions/38926cdc-fcb2-4e67-bed8-8e619ab2d5a4/resourceGroups/default-web-northeurope/providers/Microsoft.Network/dnszones/foo.com

Changing "azure-dns-updater" to a valid URI of "http://azure-dns-updater", which is the required format used for service principal names
Creating a role assignment under the scope of "/subscriptions/38926cdc-fcb2-4e67-bed8-8e619ab2d5a4/resourceGroups/default-web-northeurope/providers/Microsoft.Network/dnszones/foo.com"
  Retrying role assignment creation: 1/36
{
  "appId": "ad5931a6-3f16-4bdd-ae95-5943a8ddbf79",
  "displayName": "azure-dns-updater-foo",
  "name": "http://azure-dns-updater-foo",
  "password": "AeN~+~12ufhGH1yfh210vhq91j231SDGjP",
  "tenant": "a454b7b6-7014-4e65-b114-d48a83355acd"
}

Annotate these variables too:

• APP_ID: ad5931a6-3f16-4bdd-ae95-5943a8ddbf79.
• TENANT_ID: a454b7b6-7014-4e65-b114-d48a83355acd
• APP_SECRET: AeN~+~12ufhGH1yfh210vhq91j231SDGjP

Now, you have all the necessary to make que Azure DNS Updater works.

Usage

There are two methods to use Azure DNS Updater: Python or Docker.

Both need the variables previously obtained plus INTERVAL, that defines the number of seconds between each check.

RECORD_SET variable accepts one DNS Record or a list of DNS Records separated by comma.

Python

Download the azure-dns-updater.py and load it using this command:

$ python .\azure-dns-updater.py
\ --APP_ID="ad5931a6-3f16-4bdd-ae95-5943a8ddbf79"
\ --TENANT_ID="a454b7b6-7014-4e65-b114-d48a83355acd"
\ --SUBSCRIPTION_ID="38926cdc-fcb2-4e67-bed8-8e619ab2d5a4"
\ --APP_SECRET="AeN~+~12ufhGH1yfh210vhq91j231SDGjP"
\ --RECORD_SET="*,@"
\ --DOMAIN="foo.com"
\ --RESOURCE_GROUP="default-web-northeurope"
\ --INTERVAL=300

Docker

$ docker run -d
\ --name="Azure_DNS_Updater"
\ --hostname=azure_dns_updater
\ --restart=always
\ -e TZ="Europe/Madrid"
\ -e APP_ID="ad5931a6-3f16-4bdd-ae95-5943a8ddbf79"
\ -e TENANT_ID="a454b7b6-7014-4e65-b114-d48a83355acd"
\ -e SUBSCRIPTION_ID="38926cdc-fcb2-4e67-bed8-8e619ab2d5a4"
\ -e APP_SECRET="AeN~+~12ufhGH1yfh210vhq91j231SDGjP"
\ -e RECORD_SET="*,@"
\ -e DOMAIN="foo.com"
\ -e RESOURCE_GROUP="default-web-northeurope"
\ -e INTERVAL=300
\ danimart1991/azure-dns-updater:latest

name, hostname, restart and -e TZ="Europe/Madrid" are optional or could be changed to your behavior.