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Overlay file systems

Overlay file systems - Linux Tutorial

From the course: Linux Tips

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Overlay file systems

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- [Narrator] Overlay Mounts allow us to lay our one set of files on top of another creating what looks like a single set of files, which is really made up of more than one set. A common use case for this, is to add a user-modifiable layer on top of a read-only filesystem. An overlay filesystem is made up of a lower filesystem and an upper filesystem. The lower filesystem can be anything Linux can read and is often a read-only filesystem. But it doesn't have to be. It can even be another overlay filesystem. And you can specify more than one lower filesystem if there are a number of things you want to be combined in that way. The upper filesystem is usually a writable filesystem, but it doesn't have to be. When these filesystems are mounted together, you'll see the contents both of the upper and lower components, as long as they have different paths and names. If there's something with the same path on both parts,…

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