Running multiple Azure Functions locally

Question

I have a solution in Visual Studio 2022 with multiple Azure Functions projects in it. The projects are in .NET 4.8 using the v1 of the function run-time.

When debugging locally I want all the function applications to run. I set them all as startup projects in my solution configuration. I had already found that I can change the default port for the function app by setting a command line argument in the debug launch profile, like so.

The issue is that they all want to bind to port 5858 for debugging. Additional research uncovered the --nodeDebugPort argument. I added that to the debug profile but when I run from Visual Studio by hitting F5 they all still want to use 5858. However, if I run them from the command-line using the following command they will honor the debug port setting.

..\..\..\node_modules\azure-functions-core-tools\bin\func host start --port 7072 --nodeDebugPort 5859

Any idea why the debug port argument is ignored when running from Visual Studio but honored when running from command line?

Answer 1

Any idea why the debug port argument is ignored when running from Visual Studio but honored when running from command line?

As suggested by ahmelsayed,:

Apart from using --nodeDebugPort from command line, you can define it in local.settings.json:

{
   "NodeDebugPort": 5859
}

Other references: Two processes of func reusing the same configuration settings, How Can I run multiple Azure .net 5 Function Projects locally in Visual Studio 2019? and How to run Azure Function app on a different port in VS

You can refer to nodeDebugPort related issues on GitHub or open a new issue for further clarification.

Answer 2

I have several Azure Functions in my solution and I configure them using local.settings.json (per function) by setting the LocalHttpPort like below:

{
  "IsEncrypted": false,
  "Values": {
    ...
  },
  "Host": {
    "LocalHttpPort": 7073
  }
}

And then configure the solution in VS as "Multiple startup pojects" and choose those funcntion apps you wanna run parallel.