Sharing Image Layers

Sharing layers to improve performance

Docker images can share layers, leading to efficiencies in space and performance. One of the earlier docker pull commands generated an Already exists message for one of the layers it pulled. This occurred because one of my Docker Desktop extensions had already pulled an image that used the exact same layer. As a result, Docker skipped that layer as it already had a local copy.

Here’s the code from earlier, and the figure below shows two images sharing the same layer.