Why Your Docker Build Reinstalls Every Dependency Every Time
One changed byte early in a Dockerfile throws away everything after it. Here is how the cache key is computed and how to order instructions so it survives.
| Instruction | Key includes |
|---|---|
RUN |
The literal command string, not its effects |
COPY / ADD |
Contents and metadata of the files copied |
ENV, ARG |
The value, and it invalidates everything after |
FROM |
The resolved image digest |
Published on debugly.dev by Rohit Bhadani | Founder of Krova Cloud
