71 lines
1.6 KiB
Docker
71 lines
1.6 KiB
Docker
# Pin specific version for stability
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# Use separate stage for building image
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# Use debian for easier build utilities
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FROM golang:1.19-bullseye AS build-base
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WORKDIR /app
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# Copy only files required to install dependencies (better layer caching)
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COPY go.mod go.sum ./
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# Use cache mount to speed up install of existing dependencies
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RUN --mount=type=cache,target=/go/pkg/mod \
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--mount=type=cache,target=/root/.cache/go-build \
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go mod download
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FROM build-base AS dev
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# Install air for hot reload & delve for debugging
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RUN go install github.com/cosmtrek/air@latest && \
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go install github.com/go-delve/delve/cmd/dlv@latest
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COPY . .
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CMD ["air", "-c", ".air.toml"]
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FROM build-base AS build-production
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# Add non root user
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RUN useradd -u 1001 nonroot
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COPY . .
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# Compile healthcheck
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RUN go build \
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-ldflags="-linkmode external -extldflags -static" \
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-tags netgo \
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-o healthcheck \
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./healthcheck/healthcheck.go
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# Compile application during build rather than at runtime
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# Add flags to statically link binary
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RUN go build \
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-ldflags="-linkmode external -extldflags -static" \
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-tags netgo \
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-o api-golang
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# Use separate stage for deployable image
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FROM scratch
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# Set gin mode
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ENV GIN_MODE=release
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WORKDIR /
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# Copy the passwd file
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COPY --from=build-production /etc/passwd /etc/passwd
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# Copy the healthcheck binary from the build stage
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COPY --from=build-production /app/healthcheck/healthcheck healthcheck
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# Copy the app binary from the build stage
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COPY --from=build-production /app/api-golang api-golang
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# Use nonroot user
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USER nonroot
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# Indicate expected port
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EXPOSE 8080
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CMD ["/api-golang"]
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