11/8/2023 0 Comments Aptget install locale debian![]() ![]() Refer to the docs on the differences between the two variants. # copy build artifacts from build stageīalena base images come in two variants, namely build and run. WORKDIR /go/src//balena-io-projects/appįROM balenalib/%%BALENA_MACHINE_NAME%%-debian:stretch # use a different, leaner image in final imageĬOPY -from=build /go/src//balena-io-projects/app/. FROM balenalib/%%BALENA_MACHINE_NAME%%-golang:stretch-build AS build # define a build stage Here is an example illustrating multi-stage build for a golang project. This allows you to only copy necessary files and tools into the final image you want to ship, keeping it lean. Each stage can use a different base image and you can copy files and artifacts from one stage to another. With multi-stage builds, you can use multiple FROM statements to describe a new stage. When building your application, you might require build-time dependencies, or other files which are not needed at runtime. ![]() Multi-stage buildsīalena supports multi-stage builds. In order to reduce complexity, dependencies, file sizes, and build times, you should avoid installing extra or unnecessary packages just because they might be “nice to have.” For example, you don’t always need to include a text editor. However, we recommend you find a balance between readability (and thus long-term maintainability) of the Dockerfile and minimizing the number of layers it uses. : RUN apt-get update & apt-get install -y python Reducing the number of layers can be achieved by chaining multiple commands together with & in RUN invocations. If we combine two instructions we avoid making another layer so we’re not storing intermediate (and maybe useless) states. Reducing the number of layers in your Dockerfile can reduce the build and push time on balena. We recommend you place your ADD or COPY statements near the end of your Dockerfiles, after all your package installs and source compilation steps have been completed. If there are any changes, even in the file metadata, then the cache is invalidated. For these commands, the contents of the files being put into the image are examined. However, this is slightly different for the ADD and COPY commands. If the instructions have changed, the cache is invalidated. Move ADD and COPY CommandsĬaching in Docker is done by comparing the instructions in the current Dockerfile with the ones in the previous build. Note: For information on using multi-stage builds to reduce image sizes, see the services masterclass. If you want to read more about how Docker caches layers and Docker best practices, head over to Docker best practices. They mostly make use of the caching mechanism in the Docker container builders on our servers. These are just a few tips and tricks to optimize your balena container builds and hopefully reduce the time it takes to build and push. ![]()
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