How can I query which docker image is currently deployed to an app service from an azure release pipeline?

Question

I have an Azure release pipeline that uses an Azure Web App for Containers task to deploy a docker image on an Azure App Service.

The image is specified in the form of some_image:$(Build.BuildId). The pipeline works as intended and successfully updates the App Service with the latest built of the image.

I want from an other release pipeline to execute a docker run command using that image. I've noticed that version 1 of the Docker task allows me to execute such a docker run command on a docker image (no idea why run is missing from version 2), but how can I specify the docker image? How can I get which image is the currently deployed on that App Service?

Answer 1

Might be too late now, but what you want to do is to get the value of LinuxFXVersion (if you're running docker on Linux) property from Azure Resource Explorer.

Using a combination of Azure PowerShell and CLI, you can have these commands to retrieve the current image running on your web app:

 $webAppProperties = (az webapp config show --subscription "<subscription-id>" --resource-group "<resource-group-name>" -n "<webapp-name>") | ConvertFrom-Json
 $webAppProperties.linuxFXVersion

Assuming you have the right permissions to your subscription from Azure Pipelines, you should be able to use this information for the next steps.