Dockerfile and docker-compose.yml

Author: callicoder

docker-compose.yml

@@ -28,6 +28,8 @@ services:
     build:
       context: polling-app-client # Use an image built from the specified dockerfile in the `polling-app-client` directory.
       dockerfile: Dockerfile
+    args:
+      REACT_APP_API_BASE_URL: http://127.0.0.1:8080/api
     ports:
       - "9090:80" # Forward the exposed port 80 on the container to port 80 on the host machine
     restart: always

polling-app-client/Dockerfile

@@ -16,6 +16,10 @@ RUN npm install
 # Copy the main application
 COPY . ./
 
+# Arguments
+ARG REACT_APP_API_BASE_URL
+ENV REACT_APP_API_BASE_URL=${REACT_APP_API_BASE_URL}
+
 # Build the application
 RUN npm run build
 

polling-app-server/Dockerfile

@@ -1,20 +1,36 @@
-# Start with a base image containing Java runtime
-FROM openjdk:8-jdk-alpine
+#### Stage 1: Build the application
+FROM openjdk:8-jdk-alpine as build
 
-# Add Maintainer Info
-LABEL maintainer="callicoder@gmail.com"
+# Set the current working directory inside the image
+WORKDIR /app
 
-# Add a volume pointing to /tmp
-VOLUME /tmp
+# Copy maven executable to the image
+COPY mvnw .
+COPY .mvn .mvn
 
-# Make port 8080 available to the world outside this container
-EXPOSE 8080
+# Copy the pom.xml file
+COPY pom.xml .
 
-# The application's jar file
-ARG JAR_FILE=target/polls-0.0.1-SNAPSHOT.jar
+# Build all the dependencies in preparation to go offline. 
+# This is a separate step so the dependencies will be cached unless 
+# the pom.xml file has changed.
+RUN ./mvnw dependency:go-offline -B
 
-# Add the application's jar to the container
-ADD ${JAR_FILE} app.jar
+# Copy the project source
+COPY src src
 
-# Run the jar file 
-ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
+# Package the application
+RUN ./mvnw package -DskipTests
+RUN mkdir -p target/dependency && (cd target/dependency; jar -xf ../*.jar)
+
+#### Stage 2: A minimal docker image with command to run the app 
+FROM openjdk:8-jre-alpine
+
+ARG DEPENDENCY=/app/target/dependency
+
+# Copy project dependencies from the build stage
+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
+
+ENTRYPOINT ["java","-cp","app:app/lib/*","com.example.polls.PollsApplication"]