Azure container instance : why can't I create an ACI using PowerShell?

Question

I would like to create ACI using the following command in PowerShell:

New-AzContainerGroup -ResourceGroupName acr -Name benighilmohamed ` -Image alpine -OsType Linux ` -Command "echo 'Hello from an Azure container instance triggered by an Azure function'" ` -RestartPolicy Never

But I get the following error :

Cannot process argument transformation on parameter 'ImageRegistryCredential'. Cannot convert value "alpine" to type "Microsoft.Azure.PowerShell.Cmdlets.ContainerInstance.Models.Api20240501Preview.IImageRegistryCredential[]".
Error: "Cannot convert the "alpine" value of type "System.String" to type "Microsoft.Azure.PowerShell.Cmdlets.ContainerInstance.Models.Api20240501Preview.IImageRegistryCredential"

I don't see exactly what is going on.

New-AzContainerGroup doesn't have an -Image parameter, perhaps you're confusing the command with New-AzContainerInstanceObject? — Mathias R. Jessen
– Mathias R. Jessen, Commented May 11 at 13:45

Ranadip Dutta · Accepted Answer · 2025-05-12 07:30:43Z

Mathias is right. There is no -Image parameter in New-AzContainerGroup. You should create a container instance object first and then use it to create the container group.

$container = New-AzContainerInstanceObject -Name benighilmohamed -Image alpine -OsType Linux -Command "echo 'Hello from an Azure container instance triggered by an Azure function'

New-AzContainerGroup -ResourceGroupName acr -Name benighilmohamed -Container $container -OsType Linux -RestartPolicy Never

This should fix your issue and will create the ACI

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