November 2017
Intermediate to advanced
298 pages
7h 10m
English
Content preview from Deployment with Docker
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How images are layered
As we covered earlier, Docker stores data that composes the images in a set of discrete, read-only filesystem layers that are stacked on top of each other when you build your image. Any changes done to the filesystem are stacked like transparent slides on top of each other to create the full tree, and any files that have newer content (including being completely removed) will mask the old ones with each new layer. Our former depth of understanding here would probably be sufficient for the basic handling of containers, but for advanced usage, we need to know the full internals on how the data gets handled.
When you start multiple containers with the same base image, all of them are given the same set of filesystem layers ...
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