What this snippet does
Layers are additive, so files removed in a later instruction still occupy space in the earlier one.
Expected output
myapp latest 4c9e2a1b7d05 612MB
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
- BuildKit cache mountLayers & Caching · advanced
- Go module cacheLayers & Caching · advanced
- Inspecting layer sizesLayers & Caching · intermediate