Unveiling Whiteout Files: Do you know how file deletions are handled between layers of a Docker image?
Union file systems are a mechanism for merging two or more file systems, to present them unified, under a single mount point for the user.
The main idea behind this mechanism is to be able to alter the contents of the first file system (e.g. the contents of a CD-ROM) by writing all changes (additions, deletions, modifications) to the second (which could be a disk partition, a USB stick, …).
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