What this snippet does
docker history attributes size to each instruction, showing which step inflated the image.
Expected output
182MB RUN npm ci 4.1kB COPY . .
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
- BuildKit cache mountLayers & Caching · advanced
- Go module cacheLayers & Caching · advanced