What this snippet does
Chained commands with cleanup in the same RUN keep the deleted files out of the final layer.
Expected output
Successfully built 7d3c1e9f5a24
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
- Deleting in a later layerLayers & Caching · intermediate
- BuildKit cache mountLayers & Caching · advanced
- Go module cacheLayers & Caching · advanced
- Inspecting layer sizesLayers & Caching · intermediate