Dockerfile

# This line tells Docker to base an image on a pre-built image with Alpine Linux. You can use other images from Amazon
# Corretto registry. Alpine Linux benefit is that the image is pretty small.
FROM amazoncorretto:11-alpine3.19

ENV APPLICATION_USER ktor
RUN adduser -D -g '' $APPLICATION_USER

RUN mkdir /app
RUN chown -R $APPLICATION_USER /app

USER $APPLICATION_USER

# These lines copy the packaged application into the Docker image and sets the working directory to where it was copied.
COPY ./build/libs/validator-wrapper-jvm-*.jar /app/validator-wrapper.jar
WORKDIR /app

# Environment vars here
ENV ENVIRONMENT prod

EXPOSE 3500

# The last line instructs Docker to run java with G10s GC,  assigns 79% of the system's available memory, and indicates the packaged application.
CMD ["java", "-server", "-XX:+UnlockExperimentalVMOptions", "-XX:InitialRAMPercentage=79", "-XX:MinRAMPercentage=79", "-XX:MaxRAMPercentage=79", "-XX:+UseG1GC", "-XX:MaxGCPauseMillis=100", "-XX:+UseStringDeduplication", "-XX:+CrashOnOutOfMemoryError", "-jar", "validator-wrapper.jar", "-startServer"]