Web Reference: In order to support rm and rmdir without changing the lower filesystem, an overlay filesystem needs to record in the upper filesystem that files have been removed. This is done using whiteouts and opaque directories (non-directories are always opaque). Basically, you override the init process/script with your own via a command line to the kernel. Let's say you create the script into the root filesystem at /sbin/init-overlay, then you need to add the init=/sbin/init-overlay to the kernel boot parameters of your bootloader's config. Mar 18, 2024 · OverlayFS, a powerful and versatile filesystem, offers an innovative approach to managing files by layering multiple filesystems together. In this tutorial, we’ll learn how to use OverlayFS effectively.
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