How to Fix Failed to Mount Overlay: No Such Device Error in Docker on Ubuntu 20.04? скачать в хорошем качестве

How to Fix Failed to Mount Overlay: No Such Device Error in Docker on Ubuntu 20.04?

Discover effective solutions to resolve the 'Failed to Mount Overlay: No Such Device' error in Docker on Ubuntu 20.04. Ensure your Docker containers run smoothly with these troubleshooting steps. --- How to Fix Failed to Mount Overlay: No Such Device Error in Docker on Ubuntu 20.04? If you are encountering the error message "Failed to mount overlay: no such device" with the storage-driver set to overlay2 when running Docker on Ubuntu 20.04, you're not alone. This is a known issue that can arise due to several underlying reasons. Here, we'll explore some troubleshooting steps to resolve this error and get your Docker containers running smoothly again. Understanding the Problem The error generally indicates a problem with the overlay2 storage driver. The overlay2 driver is commonly utilized by Docker to manage how container layers interact with each other. When this driver fails to mount the overlay, Docker containers can fail to start, leading to operational issues. Possible Causes Kernel Configuration: The Linux kernel might not be configured appropriately for the overlay2 driver. Filesystem Support: The underlying filesystem may not support the overlay2 driver. Incorrect Docker Configuration: Docker may be improperly configured, leading to the error. Solutions Verify Kernel Compatibility Ensure your Linux kernel supports overlay and overlay2. The following command checks if your kernel modules are loaded: [[See Video to Reveal this Text or Code Snippet]] If the command does not return any output, you may need to load the modules manually: [[See Video to Reveal this Text or Code Snippet]] Check Filesystem Type overlay2 requires a filesystem type that supports it, such as ext4 or xfs. You can verify the filesystem of your Docker root directories with: [[See Video to Reveal this Text or Code Snippet]] Ensure the type is either ext4 or xfs. Update Docker Configuration Override Docker’s default settings by explicitly setting the storage driver to overlay2. Add or update the daemon.json file, typically located at /etc/docker/daemon.json, with the following: [[See Video to Reveal this Text or Code Snippet]] Restart Docker to apply these changes: [[See Video to Reveal this Text or Code Snippet]] Install/Update Kernel Headers Ensure the kernel headers are installed or up-to-date. Run the following command to do so: [[See Video to Reveal this Text or Code Snippet]] This command installs the appropriate headers for your current kernel version, which may resolve compatibility issues. Reboot System Sometimes, a simple reboot can resolve the issue by reloading all the necessary modules and configurations: [[See Video to Reveal this Text or Code Snippet]] Conclusion Fixing the "Failed to mount overlay: no such device" error in Docker on Ubuntu 20.04 involves ensuring kernel compatibility, verifying the underlying filesystem, making necessary changes to Docker configuration, and sometimes updating kernel headers. By following the steps outlined above, you should be able to resolve this issue and ensure your Docker containers run without any hindrances. If the problem persists even after trying these solutions, further investigation or consulting Docker-specific forums may be needed.