What this snippet does
A cache mount persists the package cache across builds without baking it into the image.
Expected output
=> [3/3] RUN pip install -r requirements.txt 4.1s
Why practise typing this
Typing layers & caching code builds muscle memory for the symbols and indentation Docker uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More Docker practice
- Dependencies before sourceLayers & Caching · intermediate
- COPY . . invalidates everythingLayers & Caching · intermediate
- Chaining to one layerLayers & Caching · intermediate
- Deleting in a later layerLayers & Caching · intermediate
- Go module cacheLayers & Caching · advanced
- Inspecting layer sizesLayers & Caching · intermediate