From the course: Docker: Build and Optimize Docker Images
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Understanding the cache mechanism - Docker Tutorial
From the course: Docker: Build and Optimize Docker Images
Understanding the cache mechanism
- [Instructor] Docker uses caching to reuse image layers when nothing is changed, so rebuilds are faster. Docker's build cache turns repetitive, time-consuming image builds into quick updates. As we discussed previously, images are built in layers from each instruction in a Docker file. When you rebuild an image, the Docker build command examines each layer's inputs. And if it finds an identical layer in its cache, it reuses that layer instead of reexecuting the step. This caching mechanism delivers several key benefits. First, it speeds up development feedback loops. If only your application code is changed, Docker can skip rerunning earlier steps like installing dependencies. Then, Docker will rebuild only the layers that change. Second, caching improves consistency across environments. Cache layers ensure that repeated builds of your base image or dependency set remain identical. This reduces the chance of it-works-on-my-machine surprises. Finally, caching cuts down repeated tasks,…
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