deployment/stacks/paper/Dockerfile

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ARG BASE_IMAGE
# Build dumb-init
FROM alpine AS dumb-init-builder
ARG DI_VER=1.2.5
WORKDIR /app
# Build dumb-init & download tshock
RUN apk add --update --no-cache build-base unzip curl && \
curl -Lo - "https://github.com/Yelp/dumb-init/archive/refs/tags/v${DI_VER}.tar.gz" | tar -xzf - && \
cd "dumb-init-${DI_VER}" && \
make SHELL=/bin/sh && \
mv dumb-init ..
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# We use ${:-} instead of a default value because the argument is always passed
# to the build, it'll just be blank most likely
FROM ${BASE_IMAGE:-'openjdk:18-slim'}
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# Build arguments
ARG MC_VERSION
ARG PAPERMC_VERSION
# Install mcstatus for healthchecks
RUN apt update && \
apt install --no-install-recommends -y python3-minimal python3-setuptools python3-pip && \
python3 -m pip install mcstatus && \
apt --purge remove -y python3-pip python3-setuptools && \
apt clean && \
groupadd -g 1000 paper && \
useradd -rMg paper -u 1000 paper
# Create worlds and config directory
WORKDIR /app
RUN mkdir -p worlds config/cache
# Download server file
ADD "https://papermc.io/api/v2/projects/paper/versions/$MC_VERSION/builds/$PAPERMC_VERSION/downloads/paper-$MC_VERSION-$PAPERMC_VERSION.jar" server.jar
# Make sure the server user can access all necessary folders
RUN chown -R paper:paper /app
# Store the cache in an anonymous volume, which means it won't get stored in the other volumes
VOLUME /app/config/cache
# Default value to keep users from eating up all ram accidentally
ENV XMX=4
ENV MC_VERSION="${MC_VERSION}"
ENV PAPERMC_VERSION="${PAPERMC_VERSION}"
# Document exposed ports
EXPOSE 25565
# Switch to non-root user
USER paper:paper
# Entrypoint runs in /app/config
COPY --from=dumb-init-builder /app/dumb-init /dumb-init
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COPY entrypoint.sh /entrypoint.sh
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WORKDIR /app/config
ENTRYPOINT ["/dumb-init", "--"]
CMD /entrypoint.sh
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HEALTHCHECK --interval=30s --timeout=5s --start-period=1m --retries=5 \
CMD mcstatus localhost:25565 ping