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FROM golang:1.21 as build
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# Set destination for COPY
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WORKDIR /app
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# Download Go modules
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COPY go.mod go.sum ./
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RUN go mod download
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# Copy the source code. Note the slash at the end, as explained in
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# https://docs.docker.com/engine/reference/builder/#copy
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COPY . ./
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# Build
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RUN CGO_ENABLED=0 GOOS=linux go build -o /listy
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FROM alpine
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COPY --from=build /listy /listy
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# Optional:
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# To bind to a TCP port, runtime parameters must be supplied to the docker command.
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# But we can document in the Dockerfile what ports
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# the application is going to listen on by default.
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# https://docs.docker.com/engine/reference/builder/#expose
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EXPOSE 5001
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# Run
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CMD ["/listy"]
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