Amazon Route53 Dynamic DNS

A simple dynamic DNS service for Route53.

⚠️ WARNING
The latest version no longer keeps the container running with a sleep script. You should either run on a schedule via cron or as a Kubernetes CronJob. If you want to continue using this the old way, please use the :3 or 3.0.1 tag.

|

Requirements

• Python3 (Tested on 3.11.2)
• Boto3
• dnspython

Usage

Kubernetes - CronJob

Secret

Create a secret containing multiple key-value pairs to store your AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY.

kubectl create secret generic aws-secret --from-literal=AWS_ACCESS_KEY_ID='my_access_-_key_id' --from-literal=AWS_SECRET_ACCESS_KEY='my_secret_access_key'

CronJob

Run every 5 minutes for the domain example.com, using the values from the secret created above. Make sure to set the record to update in the args section.

apiVersion: batch/v1
kind: CronJob
metadata:
  name: route53-dyndns-cron
spec:
  schedule: "*/5 * * * * "
  jobTemplate:
    spec:
      ttlSecondsAfterFinished: 100
      template:
        spec:
          containers:
          - image: docker.io/bshaw/route53-dyndns
            name: route53-dyndns
            imagePullPolicy: Always
            envFrom:
            - secretRef:
                name: route53-dyndns-secret
            args:
            - --record
            - example.com
            - --verbose
          restartPolicy: OnFailure

Docker / Podman

Run once for the domain example.com. Make sure to set values for AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, and the record to update.

docker run \
    --rm \
    --name route53 \
    -e AWS_ACCESS_KEY_ID= \
    -e AWS_SECRET_ACCESS_KEY= \
    bshaw/route53-dyndns \
    --record example.com --verbose

Cron

Add to your crontab / scheduler.

Run every 5 minutes for the domain example.com. Make sure to set values for AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, and the record to update.

*/5 * * * *  docker run --rm --name route53 -e AWS_ACCESS_KEY_ID="access_key_id" -e AWS_SECRET_ACCESS_KEY="secret_access_key" bshaw/route53-dyndns --record example.com --verbose

Command line

python3 r53dyndns.py --help
usage: r53dyndns.py [-h] [-r RECORD] [-v]

Update a Route53 hosted A record with with current external IP address of the system.

optional arguments:
  -h, --help            show this help message and exit
  -r RECORD, --record RECORD
                        specify the DNS A record to update
  -v, --verbose         enable verbose output

Required Environment Variables

• AWS_ACCESS_KEY_ID - An AWS Access Key
• AWS_SECRET_ACCESS_KEY - An AWS Secret Key

Credentials

Boto supports multiple ways to supply credentials.

• When running locally / via the command line, it's easy to rely on a shared credentials file
• When using Docker, it is recommended to use environment variables

See the official documentation for more details: https://boto3.amazonaws.com/v1/documentation/api/latest/guide/configuration.htm

Retrieving your external IP

This service performs a DNS query to retrieve your IP address from an OpenDNS resolver. This method arguably faster and more reliable than using an http(s) service.

Similar functionality could be done via the shell using dig: dig +short myip.opendns.com @resolver1.opendns.com;