56 lines
1.3 KiB
Docker
56 lines
1.3 KiB
Docker
FROM golang:alpine as builder
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# ------------------------ #
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# (1) install dependencies
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# ------------------------ #
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# git is needed for go modules
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RUN apk add git
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# upx to shrink executable size
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ARG UPX_VERSION="3.96"
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RUN apk add curl && \
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curl -L https://github.com/upx/upx/releases/download/v${UPX_VERSION}/upx-${UPX_VERSION}-amd64_linux.tar.xz -o /tmp/upx.tar.xz && \
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tar -xf /tmp/upx.tar.xz -C /tmp/ && ls /tmp;
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# copy sources
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ADD . /app
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WORKDIR /app
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# compile
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RUN go mod download && \
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CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o /app/binary
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# shrink executable
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RUN /tmp/upx-${UPX_VERSION}-amd64_linux/upx --brute /app/binary
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# create appuser
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ENV USER=appuser
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ENV UID=10001
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# See https://stackoverflow.com/a/55757473/12429735RUN
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RUN adduser \
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--disabled-password \
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--gecos "" \
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--home "/nonexistent" \
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--shell "/sbin/nologin" \
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--no-create-home \
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--uid "${UID}" \
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"${USER}"
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FROM scratch as production
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# import the user and group files from the builder.
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COPY --from=builder /etc/passwd /etc/passwd
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COPY --from=builder /etc/group /etc/group
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# copy executable & config
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COPY --from=builder /app/binary /app/
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COPY --from=builder /app/api.json /app/
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WORKDIR /app/
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# Use an unprivileged user.
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USER appuser:appuser
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EXPOSE 4242/tcp
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ENTRYPOINT ["/app/binary"] |