In this article, we'll cover a frustrating problem that some users face when using Docker Desktop with WSL2 on Windows 10: a missing mounted folder. This issue can be challenging to diagnose, but with the right knowledge and techniques, you'll be able to identify and resolve it.
Background on Docker Desktop WSL2 Integration
Docker Desktop for Windows includes seamless integration with Windows Subsystem for Linux 2 (WSL2), providing developers with easy access to native Linux tooling without the need for a full virtual machine. When using Docker Desktop with WSL2, a shared folder (also called a "mounted folder") is created automatically. This shared folder allows the Docker containers to interact with your local file system in the WSL2 environment.
Key Concepts
- WSL2: A lightweight virtual machine-like environment for Linux distributions on Windows
- Shared/Mounted Folder: A folder in your WSL2 Linux distribution that is linked to a folder on your Windows file system, allowing bi-directional access
Identifying the Issue
When using Docker Desktop with WSL2, if you suspect that your mounted folder is missing or not working correctly, first ensure that you've correctly set up the WSL2 integration and have verified that the shared folder was created. Access your WSL2 environment and check whether the folder is available:
# Check if Docker Desktop WSL2 integration is enabled
$ wsl --shutdown
$ wsl --set-default-version 2
$ wsl
Next, verify that the mounted folder is present and contains the expected files:
# Check for the mounted folder (usually located at /mnt/wsl/docker-desktop-data)
$ ls -la /mnt/wsl/
# Navigate to the mounted folder
$ cd /mnt/wsl/docker-desktop-data/
# Check the folder content
$ ls -la
Troubleshooting Steps
If the folder is missing or the files do not match your expectations, follow these troubleshooting steps:
-
Restart Docker Desktop: Sometimes, a simple restart can resolve the issue. Ensure that Docker Desktop and the WSL2 distribution are closed, then restart Docker Desktop and check your shared folder again.
-
Check Docker Desktop Settings: Make sure the shared folder configuration in Docker Desktop is correct. Go to Docker Desktop settings, click on "Resources," then on "File Sharing," and ensure your desired folder is added.
-
Repair or Reset WSL2 Distribution: If the shared folder is still missing, try repairing or resetting your WSL2 distribution. Open PowerShell as an administrator and run the appropriate command:
# Repair the WSL2 distribution wsl --repair# Reset the WSL2 distribution (warning: this will delete all data and settings) wsl --unregister wsl --register -
Reinstall Docker Desktop: As a last resort, uninstall and reinstall Docker Desktop, ensuring your WSL2 integration and shared folders are set up correctly during the installation process.
In this article, we covered the problem of a missing or incorrectly functioning mounted folder with Docker Desktop using WSL2 on Windows 10. By understanding the background and key concepts of this issue, and following the detailed troubleshooting steps provided, users will be well prepared to diagnose and resolve the problem.
References
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"Get started with Docker Desktop for Windows." Docs.docker.com. Docker, Inc. Accessed 2023-03-15.
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"Windows Subsystem for Linux Installation Guide for Windows 10." Docs.microsoft.com. Microsoft. Accessed 2023-03-15.