Azure Container Registry - Image Purge Script

Currently, Azure Container Registry does not provide a way to clean hoarded images in the registry. The count of the images are increasing as the automated build pipelines run, and most of these images won't be used in major versioning. So, regular cleaning is necessary to save space in repository. According to proposal here, the feature for managing lifecyle of images will be included in the service in future, but this script saves time till that time.

Prerequisites

• Windows host
• Powershell
• Azure CLI

Features

• Deleting images based on creation date
• Keeping only X amount of latest created image

Parameters

-BypassLogin If Azure CLI is already logged in, you might need to skip log in phase. Otherwise, Service Principal info must be provided for login.

-ServicePrincipalId Service Principal Id for authentication. Optional unless not bypassing login. More info about creating it here

-ServicePrincipalPassword Service Principal account key. Optional unless not bypassing login.

-ServicePrincipalTenant Azure Tenant Id. Optional unless not bypassing login.

-Subscription Name of the subscription. Optional but you should provide if you have many.

-ContainerRegistry Name of the Azure Container Registry. Mandatory.

-LastImagesToKeep Count of latest images to keep in repository. Optional. Default 5.

-DeleteDaysLimit Number of days to delete older images. Optional.

-LastImagesToKeep and -DeleteDaysLimit parameters are both optional, but they are mutually exclusive. If none of them mentioned action is to keeping latest 5 images in a repository.

Example commands

.\acr-purge.ps1 -BypassLogin -ContainerRegistry MyRegistryName -DeleteDaysLimit 30

Deletes images older than 30 days in registry of already selected subscription in Azure CLI.

.\acr-purge.ps1 -ServicePrincipalId fe3543ae-098d-4aac-9b4b-1a657ec9fb53 -ServicePrincipalPassword 455f67ff-8390-4a66-bdeb-a94a80b71507 -ServicePrincipalTenant 1adde7f6-33c7-49d8-a16b-e4dfec4893ae -Subscription MySubscription -ContainerRegistry MyRegistryName -LastImagesToKeep 10

Logins to specified Azure account and deletes all images other than latest 10 in repository

License

This project is licensed under the MIT License - see the LICENSE file for details