Going deeper I discovered the "root" of this heaviness - it's the modules file of the JDK:. UPD : as a solutions for these challenges one could use this answer: Java 11 application as docker image.
Alpine uses musl libc, as opposed to the standard glibc used by most Linuxes out there, which means that a JVM must be compatible with musl libc for supporting vanilla Alpine. The current status is summarized on the OpenJDK 11 page :. For support availability and roadmap, see Azul support roadmap. It could be grabbed on Alpine using:. Kudos and huge thanks to the Alpine team. Java 9 introduced the module system, which is a new and improved approach for grouping packages and resources, compared to jar files.
The modules file bundles all modules shipped with the JRE. The complete list of modules could be printed with java --list-modules. One thing to note however is that it replaces rt. However, modules jmodsjlink still shall be considered when one assembles minimal application. Note : slim images don't contain some modules like java. Learn more.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Skip to content.
Docker + Spring Boot examples
Permalink Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Branch: master. Find file Copy path. Raw Blame History. All rights reserved. Licensed under the Universal Permissive License v 1. This command is already scripted on build. UTF-8 Environment variables for the builder image. You signed in with another tab or window. Reload to refresh your session.
You signed out in another tab or window. Put all downloaded files in the same directory as this Dockerfile. The builder image will be use to uncompress the tar. FROM oraclelinuxslim as builder. Default to UTF-8 file. Environment variables for the builder image. Required to validate that you are using the correct file. Get a fresh version of SLIM for the final image. FROM oraclelinuxslim. Copy the uncompressed Java Runtime from the builder image. JDK assumes freetype is available.
CMD [ "jshell" ].For simplicity, this document describes how to run the most recent version of Jenkins on Java The easiest way to run Jenkins on Java 11 is with a Docker image.
These images are based on the official openjdkjdk image maintained by the Docker Community. To use the latest weekly release of the Java based images, use the jdk11 tag.
For other releases, append the -jdk11 tag to the version for exanple, 2. Between June and Februarythe community performed many exploratory tests to discover as many Java 11 issues as possible. As a result, the community solved a lot of problems before announcing Java 11 support in Jenkins.
If you discover a Java 11 incompatibility, please report the issues in the Jenkins bug tracker using the javacompatibility label. This helps us organize these issues so that they automatically appear on the Wiki page and get triaged.
Docker + Spring Boot examples
For security issues, please use the standard vulnerability reporting process. What is CDF? Jenkins X Tekton Spinnaker.
Security Press Awards Conduct Artwork. Jenkins cores more recent than 2. Production deployments should use only LTS versions of Jenkins. For example, this command starts Jenkins on Java 11 using the latest weekly release:. Discovering issues with Java 11 Between June and Februarythe community performed many exploratory tests to discover as many Java 11 issues as possible. Running any Jenkins version prior to 2.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again.
This is the Git repo of the Docker "Official Image" for openjdk not to be confused with any official openjdk image provided by openjdk upstream.
See the Docker Hub page for the full readme on how to use this Docker image and for information regarding contributing and issues. For more information about the full official images change lifecycle, see the "An image's source changed in Git, now what? Skip to content.
Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Dockerfile Shell. Dockerfile Branch: master. Find file. Sign in Sign up.
Subscribe to RSS
Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit c Apr 9, See a change merged here that doesn't show up on Docker Hub yet?Building Docker Images using Jenkins step by step - Devops Integration Live Demo - JavaTechie
Build Status Badges per-arch. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Update to Feb 8, Apr 9, Update remaining images from stretch to buster.
Feb 5, Mar 17, Further clarify build provenance by inlining relevant quotes. Nov 26, Update to Alpine 3. Feb 7, Jul 30, Note: the description for this image is longer than the Hub length limit ofso the "Supported tags" list has been trimmed to compensate. Maintained by : the Docker Community. Supported architectures : more info amd64arm64v8windows-amd The most straightforward way to use this image is to use a Java container as both the build and runtime environment.
In your Dockerfilewriting something along the lines of the following will compile and run your project:. There may be occasions where it is not appropriate to run your app inside a container.
To compile, but not run your app inside the Docker instance, you can write something like:. This will add your current directory as a volume to the container, set the working directory to the volume, and run the command javac Main. On startup JVM tries to detect the number of available CPU cores and the amount of RAM to adjust its internal parameters like the number of garbage collector threads to spawn accordingly.
In OpenJDK 11 this is turned on by default.
In versions 8, 9, and 10 you have to enable the detection of container-limited amount of RAM using the following options:. To set such limit manually, JVM can be started the following way:. If your application requires environment variables of this form, either use CMD ["java", This is the defacto image. If you are unsure about what your needs are, you probably want to use this one.
It is designed to be used both as a throw away container mount your source code and start the container to start your appas well as the base to build other images off of. Some of these tags may have names like buster or stretch in them. These are the suite code names for releases of Debian and indicate which release the image is based on. If your image needs to install any additional packages beyond what comes with the image, you'll likely want to specify one of these explicitly to minimize breakage when there are new releases of Debian.
This image is based on the popular Alpine Linux projectavailable in the alpine official image.
This variant is highly recommended when final image size being as small as possible is desired. The main caveat to note is that it does use musl libc instead of glibc and friendsso certain software might run into issues depending on the depth of their libc requirements.
However, most software doesn't have an issue with this, so this variant is usually a very safe choice. To minimize image size, it's uncommon for additional related tools such as git or bash to be included in Alpine-based images. Using this image as a base, add the things you need in your own Dockerfile see the alpine image description for examples of how to install packages if you are unfamiliar. For information about how to get Docker running on Windows, please see the relevant "Quick Start" guide provided by Microsoft:.
View license information for the software contained in this image. As with all Docker images, these likely also contain other software which may be under other licenses such as Bash, etc from the base distribution, along with any direct or indirect dependencies of the primary software being contained.
As for any pre-built image usage, it is the image user's responsibility to ensure that any use of this image complies with any relevant licenses for all software contained within. Try the two-factor authentication beta. Docker Official Images. Windows - x latest. Description Reviews Tags.It is now possible to construct a stripped-down Java Runtime, containing the minimum set of required modules.
This allows us to create slim Docker containers without excess baggage. We assume the concept of modules is familiar to the reader. If not, you can learn more about it e. To see the application in action, build it with Maven mvn clean packageand run it from the command line:. The generated JRE is therefore not portable to other platforms. The included Dockerfile file is used to perform a multi-stage build. The first stage runs the jlink command to create the custom JRE.
The second stage creates a tiny runnable Docker image, which executes the JRE created in the first stage. The first stage of the Dockerfile contains the following:.
Subscribe to RSS
Note the period at the end of the command! To be able to access our compiled jars, we copy them into our image. We only need to include the frontend module. The backend module is included transitively, because it is required by frontend. The other parameters are included to decrease the image in size, by using compression and stripping some irrelevant data.
This of course is still quite large for a hello world application. Examining this script, generated by JLink, we see that it basically just starts the stripped down JRE.
The main module and class we provided earlier as a launcher parameter are passed as command-line arguments:. This is exactly what we do in the second stage of our Dockerfile. The second stage of our Dockerfile is quite simple:. To test the image, run an instance by executing:. A reduction of more than 50 percent! We have yet to see if this approach will give us a significant benefit in real-life applications.
Listing 1. FROM alpine RUN jlink --module-path backend-module Listing 2. Second stage: Copies the custom JRE into our image and runs it.As you likely know by now, it is best practice to work in micro-services, deploying a small number of deployment units per JVM. Instead of one giant, monolithic application, you build your application such that each service can run on its own.
This is where Docker comes in! In this post, I will review 3 different ways to create Docker images for Java applications. In a package-only build, we will let Maven or your build tool of choice control the build process.
Unzip the Spring Initializr project you generated as part of the prerequisites. In the parent folder of your Spring Boot application, create a Dockerfile. In a terminal, run:. The following command tells Docker to fetch the Dockerfile in the current directory the period at the end of the command. The -t flag denotes a Docker tag, which in this case is 1. Modify the previous Dockerfile to contain the following:. Again, to test your container, navigate to localhost Stop the container once you are finished testing.
If the application layer is rebuilt, the mvn package command will force all Maven dependencies to be pulled from the remote repository all over again you lose the local Maven cache. As you can see, the multi-stage build resulted in our smallest image, whereas the normal build resulted in our largest image. This should be expected since the normal build included our application code, all of its dependencies, and our build tooling, and our multi-stage build contained only what we needed.
Of the three Docker image build methods we covered, Multi-stage builds are the way to go. You get the best of both worlds when packaging your application code — Docker controls the build, but you extract only the artifacts you need. This becomes particularly important when storing containers on the cloud. Thanks for following along, and I hope this helps! Subscribe to our monthly newsletter to see the latest Codefresh news and updates! Create Account.
Home Blog. Search for:. Prerequisites Docker is installed Maven is installed for example 1 You have a simple Spring Boot application I used the Spring Initializr project generator with a Spring Web dependency First way: Package-only Build In a package-only build, we will let Maven or your build tool of choice control the build process.
FROM openjdk : 8 - jre - alpine3. FROM maven : 3. RUN mvn clean package. Your email address will not be published.