Java Dockerfile template

Dockerfile

# 
# Following the best practices described here:
# https://snyk.io/blog/best-practices-to-build-java-containers-with-docker/
#

# Pinning the latest LTS (heree: '17-jre-alpine')
FROM eclipse-temurin:17.0.4.1_1-jre-alpine

RUN apk add dumb-init
RUN addgroup --system jvm && \
    adduser -S -s /bin/false -G jvm jvm
RUN mkdir /app && \
    chown -R jvm:jvm /app

WORKDIR /app
USER jvm

ENTRYPOINT ["/usr/bin/dumb-init", "--"]

For focal:

RUN apt-get update && \
    apt-get install -y \
        dumb-init \
        && \
    rm -rf /var/lib/apt/lists/*

RUN groupadd --system jvm && \
    useradd --system --shell /bin/false --gid jvm jvm
RUN mkdir /app && \
    chown -R jvm:jvm /app