Using AZUL 7 instead of OpenJDK Java for smaller Docker images

Using AZUL 7 instead of OpenJDK Java for smaller Docker images


Witness a tale of two Dockerfiles that perform the same task. See the size difference. Imagine how it might change infrastructure costs.

DOCKERFILE ONE


FROM debian:wheezy RUN apt-get update && apt-get install -y openjdk-7-jre && rm -rf /var/lib/apt/lists/* ADD target/si-standalone-sample-1.0-SNAPSHOT.jar / ENV JAVA_HOME /usr/lib/jvm/java-7-openjdk-amd64 ENV CLASSPATH si-standalone-sample-1.0-SNAPSHOT.jar CMD [ "java", "org.springframework.boot.loader.JarLauncher" ]


DOCKERFILE TWO


FROM debian:wheezy RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 0x219BD9C9 && echo "deb http://repos.azulsystems.com/ubuntu precise main" >> /etc/apt/sources.list.d/zulu.list && apt-get -qq update && apt-get -qqy install zulu-7 && rm -rf /var/lib/apt/lists/* ADD target/si-standalone-sample-1.0-SNAPSHOT.jar / ENV JAVA_HOME /usr/lib/jvm/zulu-7-amd64 ENV CLASSPATH si-standalone-sample-1.0-SNAPSHOT.jar CMD [ "java", "org.springframework.boot.loader.JarLauncher" ]

Notice the only difference is which Java is being installed. Here are the image sizes:

spring-integration openjdk 549.1 MB spring-integration azul 261.3 MB

Thats a 288MB difference.

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