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Obscure the existence of the same files in the image layer (“lowerdir”). This happens, the files in the container layer (“upperdir”) are dominant and Notice how the image layer and container layer can contain the same files. The unified view is exposed through a directory called “merged” which isĮffectively the containers mount point. The image layer is the “lowerdir” and the container layer is the “upperdir”. The diagram below shows how a Docker image and a Docker container are layered. The unified view is exposed through its own The OverlayFS terminology is “lowerdir” for the bottom layer and Referred to as layers and the technology used to layer them is known as a The other, and provides a single unified view. OverlayFS takes two directories on a single Linux host, layers one on top of Image layering and sharing with OverlayFS ( overlay) Uses “OverlayFS” to refer to the overall filesystem, and overlay/ overlay2 Two terms used interchangeably in some documentation. Module was renamed from “overlayfs” to “overlay”. Note: Since it was merged into the mainline kernel, the OverlayFS kernel The overlay2ĭriver is only compatible with Linux kernel 4.0 and later.įor comparison between overlay vs overlay2, please also refer to Select a More efficient than overlay in terms of inode utilization.
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Since version 1.12, Docker also provides overlay2 storage driver which is much Using it in production Docker environments.ĭocker’s overlay storage driver leverages several OverlayFS features to buildĪnd manage the on-disk structures of images and containers. has been in the mainline Linux kernel since version 3.18Īs a result, OverlayFS is rapidly gaining popularity in the Docker communityĪnd is seen by many as a natural successor to AUFS.OverlayFS is a modern union filesystem that is similar to AUFS.
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