- #Openjdk 7 centos dockerfile apk#
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When you compile a Java program, it generates a “jar” package that contains a universal binary form of the app. Of course, Java programs require a special environment to work on.
#Openjdk 7 centos dockerfile install#
Note that by default, JDK comes up with JRE, so you don’t have to manually install JRE again. Even seasoned coders might learn a thing or two.When it’s necessary to build your apps or do some programming on Java, it’s always important to have all the necessary tools ready, for example, the compiler (also known as JDK – Java Development Kit) and the runtime (also known as JRE – Java Runtime Environment). Grab it for yourself, your team, or the new computer science graduate in your life. You might also enjoy our ebook, “Hello World! A new grad’s guide to coding as a team” – a collection of essays designed to help new programmers succeed in a team setting. Pings, likes, comments, love or hate gladly received here in the comments, at or at my awesome team Credit for the epic alot picture goes to Hyperbole and a half). Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Verify that the new image only has one layer with:ĭocker history durdn/minimal-java:strippedĨeb82b59dee6 31 seconds ago 172.9 MB Imported from -ĭocker run -ti durdn/minimal-java8:stripped /opt/jdk/bin/java -version. First run it so that you have a container to refer to:ĭocker run -t durdn/minimal-java /bin/trueĭocker export `docker ps -q -n=1` | docker import - durdn/minimal-java:stripped. The technique to accomplish that is the following: For those situations it can be helpful to strip an image of all its layers and flatten it. Many times the extra layers in your base images will not be re-used. It’s a mental thing more than anything so excuse my weirdness if you can. I love the layering ability of Docker images but for base images upon which I’ll build my stacks often I’d like them to consist of a single layer. RUN mkdir /opt & curl -jksSLH "Cookie: oraclelicense=accept-securebackup-cookie" #Openjdk 7 centos dockerfile apk#
RUN apk -update add curl ca-certificates tar &Īpk add -allow-untrusted /tmp/ # AlpineLinux with a glibc-2.21 and Oracle Java 8 The whole process is well laid out amongst others in a clean Dockerfile by anapsix which I list here for completeness:
Remove spurious folders not needed (like jdk/jre/lib/desktop and others…). #Openjdk 7 centos dockerfile download#
Download the Oracle JRE/JDK using tricks in this SO article. Install glibc-2.21 which is a hard dependency of Java 8. Install curl, tar, and ca-certificates on the base alpine image. Do you want to see how that’s done? This is the list of steps: In this case we can’t use Alpine package manager (yet), we have to wrangle the installation ourselves from the official Oracle packages. NICE! What about Oracle JRE/JDK 8?įor many applications teams prefer or require the Oracle JDK. The result is a Java 7 runtime environment, ready for your Java 7 applications in only 123MB instead than 800+MB. OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode) Now you can test that java is installed with:. If you are still using JDK7 and you don’t have a strong requirement to have the Oracle version, the easiest and leaner image I found is very simple to setup with this Dockerfile: The objective: to have a minimal Java container for my (and your) applications. Let’s dream together. And the base image is … 5Mb ?! Where have I been hiding? Why didn’t I know about this?! Anyway here’s my chance to make things right. A colleague of mine few days ago mentioned Alpine Linux, a minimalistic Linux distribution based on musl libc and BusyBox that comes with a nice package manager. 
Official Java images have historically been mastodontic – cue picture above – I just tried “ docker pull java” and I got an image of 816.4MB. A minimal Java container has been on my wish list since I found out about Docker and I’ve been writing about running Java in Docker for sometime already. Sometimes I need to be hit in the head with an axe to find a solution to a problem that has been bugging me forever.
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