Docker Powershell Dynu IP update

Dynu - Dynamic DNS. Automaic IP update in docker container.

You can find many implementations of the updater in the internet. My aim was to improve my knowledge on PowerShell7 + Docker stack.

PowerShell choice makes is compatible with wider range of platforms.

Some features

In testing stage, makes it possible to validate your config (.env and Dynu account) before running the container.
Does not send the update if IP have not changed.
Health check, to make sure that all is good.
Alpine based so have small size.

Use .env-sample as a base of your .env config. There are some links to help you understand what goes where.
docker-compose -f docker-compose.yml -f docker-compose.tests.yml up -build to run tests.
docker-compose -f docker-compose.yml up -d -build to install.

Environment Variable	Example	Purpose
DYNU_USERNAME	username	your login name in dynu.com
DYNU_DOMAIN	myhome.accesscam.org	your DDns hostname in dynu.com
DYNU_PASSWORD	mySecret	your ipupdate password in dynu.com
DYNU_APIKEY	a6De5034	REST API KEY for dynu.com
DYNU_SLEEP	120	sleep seconds between checks

Allthrough DYNU_APIKEY is only used for validation, all variables are mandatory.