jens/docker-dosbox-novnc
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Shrink image by merging game fetch/extract into one layer

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The downloaded zips and their extracted contents lived in separate RUN
layers, so the zips never actually left the image despite a later
rm -rf /tmp/apps layer. unzip/smbclient were also left installed after
only being needed at build time. Merging fetch, extract, cleanup, and
package purge into a single RUN drops the image from 2.31GB to 1.6GB.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NiNnj78HGx1KWyCCo39HSz
This commit is contained in:
jens
2026-07-28 08:18:18 +02:00
co-authored by Claude Sonnet 5
parent c4049a7d79
commit 79cc239dca
2 changed files with 23 additions and 16 deletions
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Dockerfile
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# syntax=docker/dockerfile:1 # syntax=docker/dockerfile:1
FROM ich777/novnc-baseimage FROM ich777/novnc-baseimage
RUN apt-get update && \
apt-get -y install --no-install-recommends dosbox unzip alsa-utils smbclient && \
rm -rf /var/lib/apt/lists/*
RUN openssl req -x509 -nodes -newkey rsa:2048 -keyout /tmp/novnc.key -out /tmp/novnc.pem -days 3650 -subj "/C=US/ST=NY/L=NY/O=NY/OU=NY/CN=NY emailAddress=email@example.com"
ENV DISPLAY_NUM=99 ENV DISPLAY_NUM=99
ENV DISPLAY=:${DISPLAY_NUM} ENV DISPLAY=:${DISPLAY_NUM}
RUN touch /root/.Xauthority
ENV GAMES_HOME=/opt/games ENV GAMES_HOME=/opt/games
ENV SCRIPTS_HOME=/opt/scripts ENV SCRIPTS_HOME=/opt/scripts
ENV PATH=${PATH}:${SCRIPTS_HOME} ENV PATH=${PATH}:${SCRIPTS_HOME}
ADD scripts ${SCRIPTS_HOME} # unzip/smbclient are only needed to fetch and extract the games below, so they're
WORKDIR /tmp/apps # purged again in this same layer instead of being left in the final image.
RUN smbget -au smb://vlda-01/software/Games/dosbox/stuntcar.zip RUN apt-get update && \
RUN smbget -au smb://vlda-01/software/Games/dosbox/t7g.zip apt-get -y install --no-install-recommends dosbox alsa-utils unzip smbclient && \
mkdir -p ${GAMES_HOME} /tmp/apps && \
cd /tmp/apps && \
smbget -au smb://vlda-01/software/Games/dosbox/stuntcar.zip && \
smbget -au smb://vlda-01/software/Games/dosbox/t7g.zip && \
unzip -o -d ${GAMES_HOME} "*.zip" && \
cd / && \
rm -rf /tmp/apps && \
apt-get -y purge unzip smbclient && \
apt-get -y autoremove && \
rm -rf /var/lib/apt/lists/*
RUN mkdir -p ${GAMES_HOME} RUN openssl req -x509 -nodes -newkey rsa:2048 -keyout /tmp/novnc.key -out /tmp/novnc.pem -days 3650 -subj "/C=US/ST=NY/L=NY/O=NY/OU=NY/CN=NY emailAddress=email@example.com"
RUN unzip -o -d ${GAMES_HOME} "/tmp/apps/*.zip" RUN touch /root/.Xauthority
RUN rm -rf /tmp/apps
RUN cd ~ ADD scripts ${SCRIPTS_HOME}
WORKDIR /
EXPOSE 60${DISPLAY_NUM} EXPOSE 60${DISPLAY_NUM}
EXPOSE 5900 EXPOSE 5900
TODO.md
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# TODO # TODO
- Reduce image size of `jayfield/dosbox-novnc` (currently ~2.3GB). - ~~Reduce image size of `jayfield/dosbox-novnc` (currently ~2.3GB).~~ Done: merged the
game download/extract steps and the unzip/smbclient install into a single layer (so the
downloaded zips and the packages only needed to extract them no longer persist in the
final image). 2.31GB -> 1.6GB.