parkerhemphill/godaddy-dns-updater

A simple docker image that uses curl, and a simple shell script to monitor a sub-domain or domain and update GoDaddy DNS records

Flow of operations:

• 1: Container starts up and sleeps number of seconds specified by DNS_CHECK (Defaults to 900 seconds, or 15 minutes if variable not provided)
• 2: Once DNS_CHECK time has passed, container waits between 1 and 15 seconds (Randomized each time the loop runs so that you can run multiple containers and not cause an API time-out)
  • Curl makes a call to https://api.ipify.org to determine current external IP address of host.
  • Curl then makes a call to GoDaddy DNS API to get current record for sub-domain/domain, if that IP address doesn't match external IP there is a curl POST pushed to update the DNS record
• 3: Container start-up and any changes to DNS record are logged inside container to /tmp/<DOMAIN_NAME>.log, this directory can be exported to make the logs available outside container

Notes:

• Added arm and arm64 image support (Docker should pull correct image automagically)
• Multiple subdomains can be updated by appending with "|", i.e. set SUB_DOMAIN to "cool-site|other-subdomain"
• Required variables have a default set of NULL, the container looks for these and exits with a message of problem in the log file. An easy way to trouble-shoot container is to map /tmp to an external directory (explained in the docker-compose and docker run example below)
• Only required ENV variables are DOMAIN, API_KEY, and API_SECRET (Or combine API_KEY:API_SECRET in API_KEY variable). Everything else has valid defaults
• ENV variables "PUID" and "PGID" can be passed to set owner of logfile to a specific user, this is useful for mapping an external directory and setting the owner to a normal user

Docker-compose example

• In this example I will be monitoring and updating cool-site.example.com, and checking for a change to DNS every 600 seconds (10 minutes)
  • volumes can be omitted or mapped somewhere such as a a folder under your home directory, simply change the left side to point to where you'd like to save DNS update logfiles
• Change "TIME_ZONE" to match your desired timezone. A vaild list can be found at https://www.wikiwand.com/en/List_of_tz_database_time_zones under the "TZ database name" column. Default is "America/New_York"

#docker-compose.yaml
version: "3"
services:
  godaddy-ddns:
    image: parkerhemphill/godaddy-dns-updater
    container_name: godaddy-ddns
    restart: unless-stopped
    environment:
      DOMAIN: 'example.com'
      SUB_DOMAIN: 'cool-site'
      API_KEY: 'GO_DADDY_DNS_API_KEY'
      API_SECRET: 'GO_DADDY_API_SECRET'
      DNS_CHECK: 600
      TIME_ZONE: America/New_York
    volumes:
      - /tmp:/tmp

Docker run example

docker run -d \
  --name=godaddy-dns-updater \
  -e TIME_ZONE=America/New_York \
  -e DOMAIN=example.com \
  -e SUB_DOMAIN=cool-site \
  -e API_KEY='GO_DADDY_DNS_API_KEY' \
  -e API_SECRET='GO_DADDY_DNS_SECRET_KEY' \
  -e DNS_CHECK=600 \
  -v /tmp:/tmp \
  --restart unless-stopped \
  parkerhemphill/godaddy-dns-updater:latest

Support

• Shell access while the container is running:
  docker exec -it godaddy-dns-updater /bin/bash
• To see log of DNS updates:
  docker exec -it godaddy-dns-updater cat /tmp/*.log
• Container version number:
  docker inspect -f '{{ index .Config.Labels "build_version" }}' godaddy-dns-updater
• Image version number:
  docker inspect -f '{{ index .Config.Labels "build_version" }}' parkerhemphill/godaddy-dns-updater