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34 lines
1.1 KiB
Docker
34 lines
1.1 KiB
Docker
# Stage 1: Build the application (The Build Stage)
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# Use a Java SDK image with Maven pre-installed
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FROM maven:3.9-jdk-17-slim AS build
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# Set the working directory inside the container
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WORKDIR /app
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# Copy the Maven project files (pom.xml) first to leverage Docker layer caching
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COPY pom.xml .
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# Copy the source code
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COPY src ./src
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# Build the Spring Boot application, skipping tests to speed up the Docker build
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# This creates the executable JAR file in the 'target' directory
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RUN mvn clean package -DskipTests
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# Stage 2: Create the final lightweight image (The Runtime Stage)
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# Use a smaller Java Runtime Environment (JRE) image for a smaller footprint
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FROM openjdk:17-jre-slim
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# Set the working directory in the final image
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WORKDIR /app
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# Copy the built JAR file from the 'build' stage into the final image
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# The JAR file is typically named 'target/<your-app-name>-<version>.jar'
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# You may need to adjust the name if you have a non-standard pom.xml
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COPY --from=build /app/target/*.jar app.jar
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# Expose the default Spring Boot port
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EXPOSE 8080
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# Define the command to run the application
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ENTRYPOINT ["java", "-jar", "app.jar"] |