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# syntax=docker/dockerfile:1
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# Comments are provided throughout this file to help you get started.
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# If you need more help, visit the Dockerfile reference guide at
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# https://docs.docker.com/go/dockerfile-reference/
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# Want to help us make this template better? Share your feedback here: https://forms.gle/ybq9Krt8jtBL3iCk7
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################################################################################
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# Create a stage for building the application.
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ARG GO_VERSION=1.22.3
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FROM --platform=$BUILDPLATFORM golang:${GO_VERSION} AS build
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WORKDIR /src
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# Download dependencies as a separate step to take advantage of Docker's caching.
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# Leverage a cache mount to /go/pkg/mod/ to speed up subsequent builds.
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# Leverage bind mounts to go.sum and go.mod to avoid having to copy them into
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# the container.
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RUN --mount=type=cache,target=/go/pkg/mod/ \
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--mount=type=bind,source=go.sum,target=go.sum \
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--mount=type=bind,source=go.mod,target=go.mod \
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go mod download -x
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# This is the architecture you’re building for, which is passed in by the builder.
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# Placing it here allows the previous steps to be cached across architectures.
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ARG TARGETARCH
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# Build the application.
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# Leverage a cache mount to /go/pkg/mod/ to speed up subsequent builds.
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# Leverage a bind mount to the current directory to avoid having to copy the
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# source code into the container.
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RUN --mount=type=cache,target=/go/pkg/mod/ \
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--mount=type=bind,target=. \
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CGO_ENABLED=0 GOARCH=$TARGETARCH go build -o /bin/server .
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################################################################################
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# Create a new stage for running the application that contains the minimal
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# runtime dependencies for the application. This often uses a different base
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# image from the build stage where the necessary files are copied from the build
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# stage.
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#
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# The example below uses the alpine image as the foundation for running the app.
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# By specifying the "latest" tag, it will also use whatever happens to be the
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# most recent version of that image when you build your Dockerfile. If
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# reproducability is important, consider using a versioned tag
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# (e.g., alpine:3.17.2) or SHA (e.g., alpine@sha256:c41ab5c992deb4fe7e5da09f67a8804a46bd0592bfdf0b1847dde0e0889d2bff).
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FROM alpine:latest AS final
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# Install any runtime dependencies that are needed to run your application.
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# Leverage a cache mount to /var/cache/apk/ to speed up subsequent builds.
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RUN --mount=type=cache,target=/var/cache/apk \
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apk --update add \
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ca-certificates \
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tzdata \
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&& \
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update-ca-certificates
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# Create a non-privileged user that the app will run under.
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# See https://docs.docker.com/go/dockerfile-user-best-practices/
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ARG UID=10001
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RUN adduser \
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--disabled-password \
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--gecos "" \
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--home "/nonexistent" \
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--shell "/sbin/nologin" \
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--no-create-home \
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--uid "${UID}" \
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appuser
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USER appuser
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# Copy the executable from the "build" stage.
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COPY --from=build /bin/server /bin/
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# Expose the port that the application listens on.
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EXPOSE 8080
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# What the container should run when it is started.
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ENTRYPOINT [ "/bin/server" ]
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