Generic Multi-stage Dockerfile for Springboot Apps with Unit and Integration tests

Dockerfile

# #####################################################################
# Build stage for building the target directory before running tests
# #####################################################################
FROM marcellodesales/gradle:2.13 as builder
MAINTAINER marcello.desales@gmail.com

USER root

#RUN apt-get update && apt-get install -y git

# Only copy the necessary to pull only the dependencies
# ADD ./.git /opt/build/.git
ADD ./src /opt/build/src

ADD ./build.gradle /opt/build/build.gradle
# ADD ./settings.gradle /opt/build/settings.gradle
# Add the gradle scripts to the right location
ADD ./src/build/gradle/ /opt/build/src/build/gradle
# ADD ./gradlew /opt/build/gradlew
# ADD ./gradle /opt/build/gradle

WORKDIR  /opt/build/

RUN gradle build bootRepackage -x test

# https://stackoverflow.com/questions/40122152/how-to-remove-entrypoint-from-parent-image-on-dockerfile/40122359#40122359
ENTRYPOINT []

# #####################################################################
# Build stage for running the unit tests from the target directory
# #####################################################################
FROM builder as unit-tests

WORKDIR /opt/build/

# 1. Build: docker build -t config-server-unit-tests --target config-server-unit-tests .
# 2. Run: docker run --rm config-server-unit-tests
# Run the full packaging after copying the source
CMD gradle --stacktrace check test -x checkJavadoc

# #####################################################################
# Build stage for running the unit tests from the target directory
# #####################################################################
FROM builder as integration-tests

WORKDIR /opt/build/

# 1. Build: docker build -t config-server-unit-tests --target config-server-unit-tests .
# 2. Run: docker run --rm config-server-unit-tests
# Run the full packaging after copying the source
CMD gradle --stacktrace check integrationTest

# #####################################################################
# Runtime stage
# #####################################################################
FROM openjdk:8-jre-slim

# Port used by the server
EXPOSE 8080

# This is to support HTTPS calls to other services
RUN apt-get update && apt-get install -y curl ca-certificates
RUN update-ca-certificates && \
   mkdir -p /usr/share/ssl/certs && \
   chmod 755 /usr/share/ssl/certs

# Copy from the previous stage
# If this is enabled, http://cloud.spring.io/spring-cloud-config/spring-cloud-config.html#_encryption_and_decryption
# COPY --from=unit-tests /opt/build/jce_policy-8.zip /tmp/
COPY --from=unit-tests /opt/build/build/libs/*.war /tmp/
COPY --from=unit-tests /opt/build/src/main/resources /runtime/resources

# Just rename the built version
RUN find /tmp -name "*.war" ! -name "*sources*" ! -name "*javadoc*" -exec cp -t /runtime {} + && \
    mv /runtime/*.war /runtime/server.jar && \
    rm -f /tmp/*.war

# What to execute on docker run
ENTRYPOINT sh -c "java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom \
           $JAVA_PARAMS -jar /runtime/server.jar --server.port=8080 $SPRING_BOOT_APP_OPTS"

Generate a runtime image

• docker build -t myservice .
• docker run --rm -ti -p 8080:8080 myservice

Generate a test image

• docker build -t myservice-unit-tests --target unit-tests .
• docker run --rm myservice-unit-tests