Dockerfile

# Multi-stage build for smaller final image
FROM maven:3.9-openjdk-17-slim AS builder

WORKDIR /app

# Copy pom.xml and download dependencies (for better layer caching)
COPY pom.xml .
RUN mvn dependency:go-offline -B

# Copy source code and build
COPY src ./src
RUN mvn clean package -DskipTests

# Production stage
FROM openjdk:17-jdk-slim

WORKDIR /app

# Install curl for health checks
RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*

# Create non-root user for security
RUN groupadd -r spring && useradd -r -g spring spring

# Copy the JAR from builder stage
COPY --from=builder /app/target/*.jar app.jar

# Change ownership to spring user
RUN chown spring:spring app.jar

# Switch to non-root user
USER spring

# Expose port
EXPOSE 9091

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
    CMD curl -f http://localhost:9091/api/auth/health || exit 1

# Set JVM options for containerized environment
ENV JAVA_OPTS="-Xmx512m -Xms256m -XX:+UseG1GC -XX:MaxGCPauseMillis=200"

# Run the application
ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]