What this snippet does
Fewer layers does not mean a smaller image; what you copy in is what dominates the size.
Expected output
myapp latest 418MB
Why practise typing this
Typing image optimisation 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
- apt cleanup in one layerImage Optimisation · intermediate
- Alpine without a cacheImage Optimisation · intermediate
- Stripping a Go binaryImage Optimisation · advanced
- Installing production deps onlyImage Optimisation · intermediate
- Comparing base image sizesImage Optimisation · intermediate
- Auditing wasted spaceImage Optimisation · advanced