Dockerfile.example

FROM eclipse-temurin:17-jdk-alpine as build
WORKDIR /workspace/app

# Copy maven executable to the image
COPY mvnw .
COPY .mvn .mvn

# Copy the pom.xml file
COPY pom.xml .

# Build all the dependencies in preparation to go offline
RUN ./mvnw dependency:go-offline -B

# Copy source code
COPY src src

# Package the application
RUN ./mvnw package -DskipTests
RUN mkdir -p target/dependency && (cd target/dependency; jar -xf ../*.jar)

# Runtime stage
FROM eclipse-temurin:17-jre-alpine
VOLUME /tmp
VOLUME /logs

ARG DEPENDENCY=/workspace/app/target/dependency

# Copy project dependencies
COPY --from=build ${DEPENDENCY}/BOOT-INF/lib /app/lib
COPY --from=build ${DEPENDENCY}/META-INF /app/META-INF
COPY --from=build ${DEPENDENCY}/BOOT-INF/classes /app

# Create a non-root user and group
RUN addgroup -S loadbalancer && adduser -S loadbalancer -G loadbalancer

# Set proper permissions
RUN chown -R loadbalancer:loadbalancer /app /tmp /logs

# Switch to non-root user
USER loadbalancer

# Set environment variables
ENV JAVA_OPTS="-Xmx512m -Xms256m"

# Run the application
ENTRYPOINT ["java", "-cp", "app:app/lib/*", "com.loadbalancer.LoadBalancerApplication"]