When you build a Docker image, Docker caches each instruction as a layer. If an instruction and its input files remain unchanged, Docker reuses the cached layer.
If you only modify a .go file, Docker will reuse the cached module layer and only re-run the build command, cutting build times from minutes to seconds. Optimized Dockerfile Pattern run go mod download docker
Dependencies change much less frequently than application source code. By running go mod download after copying only go.mod and go.sum , you create a cached layer containing all your external libraries. When you build a Docker image, Docker caches
The "standard" way to dockerize a Go app uses a multi-stage build to ensure the final image is small. Why we use go mod download before build go application? Why we use go mod download before build go application
Using RUN go mod download in a Dockerfile is a standard practice for optimizing Go application builds. By separating dependency management from the actual build step, you can significantly reduce build times through efficient layer caching. Why Use RUN go mod download ?