alex/Dockerfile

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FROM rust:1.70-alpine3.18 AS builder
ARG DI_VER=1.2.5
WORKDIR /app
COPY . ./
RUN apk add --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 ..
RUN cargo build && \
[ "$(readelf -d target/debug/alex | grep NEEDED | wc -l)" = 0 ]
# We use ${:-} instead of a default value because the argument is always passed
# to the build, it'll just be blank most likely
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FROM eclipse-temurin:18-jre-alpine
# Build arguments
ARG MC_VERSION=1.19.4
ARG PAPERMC_VERSION=525
RUN addgroup -Sg 1000 paper && \
adduser -SHG paper -u 1000 paper
# Create worlds and config directory
WORKDIR /app
RUN mkdir -p worlds config/cache backups
# Download server file
ADD "https://papermc.io/api/v2/projects/paper/versions/$MC_VERSION/builds/$PAPERMC_VERSION/downloads/paper-$MC_VERSION-$PAPERMC_VERSION.jar" server.jar
# Make sure the server user can access all necessary folders
RUN chown -R paper:paper /app
# Store the cache in an anonymous volume, which means it won't get stored in the other volumes
VOLUME /app/config/cache
VOLUME /app/backups
COPY --from=builder /app/dumb-init /bin/dumb-init
COPY --from=builder /app/target/debug/alex /bin/alex
RUN chmod +x /bin/alex
# Default value to keep users from eating up all ram accidentally
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ENV ALEX_CONFIG=/app/config \
ALEX_WORLD=/app/worlds \
ALEX_BACKUP=/app/backups \
ALEX_SERVER=paper \
ALEX_XMS=1024 \
ALEX_XMX=2048 \
ALEX_JAR=/app/server.jar \
ALEX_SERVER_VERSION="${MC_VERSION}-${PAPERMC_VERSION}" \
ALEX_LAYERS="2min,2,4,4;3min,3,2,2"
# Document exposed ports
EXPOSE 25565
# Switch to non-root user
USER paper:paper
ENTRYPOINT ["/bin/dumb-init", "--"]
CMD ["/bin/alex", "run"]