Permission Error When Starting Azure Functions Host

Mila 25 Reputation points

hello , can someone help me with this?
I have encountered a permission error related to the '/dev/shm' directory.

Here are the details of the problem I am experiencing:

  1. Environment: I am working on a macOS system.
  2. Project Details: I have developed an Azure Functions project using Python.
  3. Steps Taken: I have followed the recommended steps to set up and run the Azure Functions host.
  • Created a virtual environment and activated it.
  • Installed the required dependencies specified in the 'requirements.txt' file.
  • Ran the command 'func host start' to start the Azure Functions host.

However, upon executing the command, I received the following error message:

[2023-05-30T13:59:12.658Z] PermissionError: [Errno 1] Operation not permitted: '/dev/shm'

I have attempted various troubleshooting steps, such as using the --no-shared-memory flag and specifying a different port with --port, but the issue persists.

I would greatly appreciate your assistance in resolving this permission error so that I can successfully start the Azure Functions host and continue with my project development.

Your guidance and support in resolving this issue would be highly appreciated.

Thank you in advance

Azure Functions
Azure Functions
An Azure service that provides an event-driven serverless compute platform.
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Accepted answer
  1. MuthuKumaranMurugaachari-MSFT 22,261 Reputation points

    Mila Thank you for posting your question in Microsoft Q&A. As per Development options doc, currently local Python development is not supported on ARM64 devices including M1 chip on a Mac. However, you can run in an emulated x86 environment described in x86 emulation on ARM64 doc as a workaround or follow the steps for Docker Client on macOS.

    As per last update from the product team, we are targeting releasing preview support for Python 3.11 by the end of May (will update the latest), which will include support for ARM 64 when using 3.11. I hope this helps and let me know if you have any questions or face any issues.

    If you found the answer to your question helpful, please take a moment to mark it as "Yes" for others to benefit from your experience. Or simply add a comment tagging me and would be happy to answer your questions.

    1 person found this answer helpful.

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  1. VasimTamboli 4,775 Reputation points

    The permission error you are encountering related to the '/dev/shm' directory when starting the Azure Functions host on macOS is likely due to the default configuration of Docker for Mac. Docker for Mac restricts the permissions on the '/dev/shm' directory, which is required by the Azure Functions host.

    To resolve this issue, you can try the following steps:

    Open Docker Preferences: Go to the Docker Desktop application and open the preferences/settings.

    Access Resources: Navigate to the "Resources" section in the preferences.

    Adjust Shared Memory Size: Increase the size of the shared memory by adjusting the "Memory" slider. Increase it to a value that meets the requirements of your Azure Functions project.

    Apply Changes: Click on the "Apply & Restart" button to save the changes and restart Docker.

    Start Azure Functions Host: After Docker restarts, try starting the Azure Functions host again using the 'func host start' command in your virtual environment.

    By adjusting the shared memory size in Docker for Mac, you should be able to resolve the permission error related to the '/dev/shm' directory and successfully start the Azure Functions host.

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