マルチステージビルドを使ってイメージを軽量化する

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Mac OS Sonoma 14.5
Docker Desktop 4.30.0 (149282)
hugo v0.122.0+extended linux/amd64 BuildDate=unknown

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docker images | grep hugo
blog-hugo-hugo.slim   latest    390353669295   2 days ago     118MB
blog-hugo-hugo        latest    03b7c5dd095c   3 months ago   2.29GB
blog-hugo-tcardgen    latest    ee9b3f491796   3 months ago   1.52GB

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FROM alpine:3.19.1

# https://github.com/gohugoio/hugo/releases
ARG HUGO_VERSION=v0.122.0

# https://gohugo.io/installation/linux/
RUN apk add --update --no-cache go g++
RUN CGO_ENABLED=1 go install -tags extended github.com/gohugoio/hugo@${HUGO_VERSION}

ENV PATH="/root/go/bin:${PATH}"
WORKDIR /src

EXPOSE 1313
ENTRYPOINT [ "hugo", "server", "--bind", "0.0.0.0", "--port", "1313"]

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# Build stage
FROM golang:1.22-alpine3.19 AS build

# https://github.com/gohugoio/hugo/releases
ARG HUGO_VERSION=v0.122.0

# Install dependencies
RUN apk add --update --no-cache g++ git

# Build Hugo
RUN go install -tags extended github.com/gohugoio/hugo@${HUGO_VERSION}

# Final stage
FROM alpine:3.19.1

# Install necessary runtime dependencies
RUN apk add --no-cache libstdc++

# Copy Hugo binary from the build stage
COPY --from=build /go/bin/hugo /usr/local/bin/hugo

# Set up the environment and working directory
ENV PATH="/usr/local/bin:${PATH}"
WORKDIR /src

# Expose the port Hugo server will run on
EXPOSE 1313

# Set the entrypoint for the container
ENTRYPOINT [ "hugo", "server", "--bind", "0.0.0.0", "--port", "1313"]

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docker images | grep hugo
blog-hugo-hugo        latest    41d66490712f   About a minute ago   127MB
blog-hugo-tcardgen    latest    31cd83d37a0e   22 minutes ago       1.58GB
blog-hugo-hugo.slim   latest    390353669295   2 days ago           118MB