What this snippet does
ARG values exist only during the build and can be overridden with --build-arg.
Expected output
building 1.0.0
Why practise typing this
Typing env & arg 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
- Setting an environment variableENV & ARG · beginner
- Multiple values in one layerENV & ARG · beginner
- ARG is gone at runtimeENV & ARG · intermediate
- ARG before FROM has limited scopeENV & ARG · advanced
- Parameterised base imageENV & ARG · advanced
- Secrets leak through build argsENV & ARG · advanced