.dockerignore

Add a .dockerignore file and use specific COPY commands.

The ls_extensions and ls_extensions_git functions might help fine-tuning your .dockerignore file.

Branch

001-dockerignore

Diff

000-baseline…​001-dockerignore

Result

Image (MB) Layer Count node Binary (MB) node_modules (MB) Server (B)

Baseline

1740

22

116.0

51.0

2515

Result

1660

24

116.0

24.0

2515

 
$ SOURCE_DATE_EPOCH=1 GITHUB_SHA="N/A" scripts/docker_build.sh -p linux/amd64 -t 001-dockerignore -n
...

$ docker images de.sdavids/sdavids-node-docker-image-slimming:001-dockerignore --format "{{.Repository}}\t{{.Tag}}\t{{.Size}}"
de.sdavids/sdavids-node-docker-image-slimming   001-dockerignore    1.66GB

$ docker run --rm de.sdavids/sdavids-node-docker-image-slimming:001-dockerignore du -hs /usr/local/bin/node
116M /usr/local/bin/node

$ docker run --rm de.sdavids/sdavids-node-docker-image-slimming:001-dockerignore du -hs /node
24M /node

$ docker run --rm de.sdavids/sdavids-node-docker-image-slimming:001-dockerignore du -hs /node/node_modules
24M /node/node_modules

$ docker run --rm de.sdavids/sdavids-node-docker-image-slimming:001-dockerignore stat -c "%s" /node/server.mjs
2515

$ docker run --rm de.sdavids/sdavids-node-docker-image-slimming:001-dockerignore ls -A /node
healthcheck.mjs
node_modules
package-lock.json
package.json
scripts
server.mjs

$ docker image history --format "table {{.Size}}\t{{.CreatedBy}}" de.sdavids/sdavids-node-docker-image-slimming:001-dockerignore
SIZE      CREATED BY
0B        LABEL org.opencontainers.image.licenses=Apac…
0B        HEALTHCHECK &{["CMD-SHELL" "node /node/healt…
0B        CMD ["node" "server.mjs"]
0B        EXPOSE map[3000/tcp:{}]
0B        USER node:node
0B        ENV PORT=3000
0B        ENV NODE_ENV=production
16.4kB    COPY --chown=node:node src/js ./ # buildkit
36.8MB    RUN /bin/sh -c npm i &&     chown -R node:no…
57.3kB    COPY --chown=node:node package.json package-…
16.4kB    COPY --chown=node:node scripts/macos_node_mo…
8.19kB    WORKDIR /node
0B        CMD ["node"]
0B        ENTRYPOINT ["docker-entrypoint.sh"]
20.5kB    COPY docker-entrypoint.sh /usr/local/bin/ # …
5.41MB    RUN /bin/sh -c set -ex   && export GNUPGHOME…
0B        ENV YARN_VERSION=1.22.22
202MB     RUN /bin/sh -c ARCH= && dpkgArch="$(dpkg --p…
0B        ENV NODE_VERSION=22.15.0
69.6kB    RUN /bin/sh -c groupadd --gid 1000 node   &&…
619MB     RUN /bin/sh -c set -ex;  apt-get update;  ap…
194MB     RUN /bin/sh -c set -eux;  apt-get update;  a…
52.2MB    RUN /bin/sh -c set -eux;  apt-get update;  a…
133MB     # debian.sh --arch 'amd64' out/ 'bookworm' '…

$ printf 'Layer Count: %s\n' "$(docker history de.sdavids/sdavids-node-docker-image-slimming:001-dockerignore | tail -n +2 | wc -l | tr -d ' ')"
Layer Count: 24

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