Adding Azure Functions Support to a Devcontainer

I already had a dev container set up and needed to add Azure Functions Core Tools to it. This is the approach that finally worked for me.

The Challenge

I needed to add support for Azure Functions to my existing Dev Container. I tried a few approaches and hit errors along the way. After some digging through the docs and a bit of trial and error, I landed on a version that rebuilt cleanly.

The Solution

To begin, I attempted to add the following lines to my Dockerfile:

That version failed when I rebuilt the container. After searching around and comparing a few examples, I landed on this RUN command:

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RUN curl https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor > microsoft.gpg \
    && sudo mv microsoft.gpg /etc/apt/trusted.gpg.d/microsoft.gpg \
    && apt-get update \
    && sudo sh -c 'echo "deb [arch=amd64] https://packages.microsoft.com/debian/$(lsb_release -rs | cut -d'.' -f 1)/prod $(lsb_release -cs) main" > /etc/apt/sources.list.d/dotnetdev.list' \
    && sudo apt-get update \
    && apt-get -y install azure-functions-core-tools-4

This successfully rebuilt the container image and had the Azure Functions Core Tools installed.

Next, I added the following extensions to the devcontainer.json file:

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	"extensions": [
		"ms-azuretools.vscode-azurefunctions",
		"ms-vscode.azure-account",
		"ms-azuretools.vscode-azureresourcegroups",
		"azurite.azurite"
	]

With that in place, I had a working dev container with Azure Functions Core Tools and the Visual Studio Code extensions I needed.

References:
Use a Docker container as a development environment with Visual Studio Code
Work with Azure Functions Core Tools
Azure Functions Core Tools