gradle docker example

For this example, Im going to use a simple Spring Boot application. Home Java Core Java Docker Containers With Gradle in 4 Steps, Posted by: Andrew Glover You can find all the source code in my Github repository dubbed galoshe. The gradle-docker plugin by Transmode is actually 1 of 2 available plugins for Dockering with Gradle. In my opinion, this makes it error-prone and harder to maintain. All thats left to do is run your build and fire the image up! Project example was taken from Gradle/db-example-large-multi-project. Check it out: Running this application is as easy as typing: That command will fire up an embedded web container with the request path / mapped to return the simple String Hello to you, world. Subsequent runs will be lightning quick though. After your build completes, your image will be created with the tag I noted earlier. I was quite sceptical with Jib at the beginning. That script will essentially call the command: At this point, you are almost done. In short - you need to build Docker image and push it to registry. However, Jib allows detailed configuration and at the end of the day, it feels quite natural to use configuration of image in Gradle script, instead of preparing separate Dockerfile. What is more - Jib is not an abstraction above Docker. Android Full Application Tutorial series, 11 Online Learning websites that you should check out, Advantages and Disadvantages of Cloud Computing Cloud computing pros and cons, Android Location Based Services Application GPS location, Difference between Comparator and Comparable in Java, GWT 2 Spring 3 JPA 2 Hibernate 3.5 Tutorial, Java Best Practices Vector vs ArrayList vs HashSet, The class to run i.e. Firstly, Java 8 isnt currently available for this plugin. Receive Java & Developer job alerts in your Area, I have read and agree to the terms & conditions. These are the tasks added to build.gradle to build and push Docker image. the class in your application that contains a, The target JVM version (default is Java 7). Maximum amount of results per page across SerpApis supported Google engines, Network Experiments with VMware NSX-T and Cisco Modeling Labs, Analyzing correlations with Python: Most Correlated Equity Pairs, How the Executive Assistant to Slacks CTO, Shelley Trask, uses Slack, MongoDB migration in Springboot using Mongock, How to start up Kafka on Docker & Demo with Spring Boot and Camel. You can avoid implementing Gradle tasks yourself and managing dependencies between them. Consequently, you need to specify a few properties in your build.gradle file so that the corresponding Dockerfile builds a valid container that automatically runs your application. I am gonna create a single Dockerfile where I am gonna pull Gradle image, build my SpringBoot application using the Gradle image, generate Jar file & pass this Jar to another Docker image (Java image) & run it. You can define what port this application will run on via an application.properties file like so: Consequently, if I take my browser and point it to localhost:8080, I see the pedestrian, but oh-so-gratifying-when-you-see-it salutation. The gradle-docker plugin doesnt directly create a Docker container it merely creates a Dockerfile and then shells out to the docker command to build an image. Software development, DevOps and home automation stuff. One example is main class of your app. Accordingly, my build.gradle defines all three properties like so: A few notes about these properties. It is very simple to use and at the same time flexible with configuration options. When you have fat JAR file built with Gradle for your application, all you need to do is: Seems like an easy task, but there are a few nuisances here and there. All you need to do is configuring few options and you get functionality very similar to the CLI approach presented above. Love podcasts or audiobooks? June 18th, 2014 Keep in mind, however, that in order to use the gradle-docker plugin I use in this example, youll need to have Docker installed as the plugin shells out to the docker command. This example also works on the Buildkite Agent using the Docker Compose plugin to run Gradle in the Gradle Docker container, which works great on the Elastic CI Stack for AWS. Finally, the mainClassName shouldnt be too surprising its the hook into your application. If so, then you are only 4 steps away from Docker nivana. You get this simplicity at the cost of flexibility, but for most cases this is a good deal. Java Code Geeks and all content copyright 2010-2022. Preparing Dockerfile seemed to be very simple and something I have used to. Consequently, to ensure my Docker container exposes port 8080 as defined in my application.properites file, Ill add the following clause to my build.gradle file: A few other aspects you can muddle with via the plugin are addFile which results in an ADD instruction, runCommand, which results in a RUN instruction, and finally setEnvironment, which creates an ENV instruction. Do you need to create a Docker image from your Java web app? Spring Boot with MongoDB integration guide with multiple data sources. 0 An example of how to run a Gradle project in Docker, in a Buildkite pipeline. Java is a trademark or registered trademark of Oracle Corporation in the United States and other countries. If you dont specify a sourceCompatibility, youll get Java 7. Examples Java Code Geeks is not connected to Oracle Corporation and is not sponsored by Oracle Corporation. As you can see above there are dependencies between the tasks to make sure JAR file is ready before copying it to docker directory and image is build before pushing image. For instance, a quick and dirty hello world Boot app is essentially more imports & annotations than actual code. If you want to build Docker image locally run: To create and push image to Docker repository run: Palantir Gradle plugin handles basic stuff for you. Now that youve been introduced to the application Id like to distribute as a Docker container, let me show you how to do it in 4 easy steps. It is simple to use and looks very familiar for anyone specifying Dockerfile earlier. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. In the world of cloud-native applications - Docker and containerization is a must. In my case, the tag will be aglover/galoshe, which I can quickly see by running the images command: I can naturally go to my browser, hit localhost:8080 and find myself quite satisfied that my image runs a nifty greeting. Of course, I would need to publish this image for others to use it; nevertheless, as you can see, the gradle-plugin allows me to quickly create Docker containers for Java apps. You signed in with another tab or window. Using Google Jib makes preparing and pushing Docker image pretty easy. Provided youve configured the gradle-plugin properly, all thats left to do is run your build. It was mainly because of additional complexity from introducing another abstraction level with image manifest in Gradle. "maniekq/${project.name}:${project.version}", 'adoptopenjdk:11.0.5_10-jre-hotspot-bionic', Add task to Gradle copying built JAR file to the place available for. That was certainly my long standing reaction until I took a serious look at Boot. Next up, youll need to provide some clues so the plugin can create a valid Dockerfile. First and foremost, to Docker-ize your application, youll need to use two Gradle plugins: docker and application. Palantir also has additional functionalities for Docker Compose tasks and running Docker images if you need that. This feature allows better separation between Docker image layers and can potentially save you some time on building images. Now your Gradle script is ready to start Docker-ing. Dockerfiles contain specialized instructions for the corresponding image they create. Palantir Gradle plugin solves a lot of these issues. Now youre done with your Gradle build. Jar (or war) file as a final artifact is no longer an option. It looks like another level of abstraction which can make specific configuration harder. So in my case, the corresponding image is tagged aglover/galoshe. Learn how your comment data is processed. If you havent had a chance to see Spring Boot in action, then youre in for a treat, especially if the words simple and Java web app in the same sentence make you flinch. Fortunately, well known tools like Gradle can significantly help with this task. This may be useful for simplifying your CI pipeline. https://tomgregory.com/automating-docker-builds-with-gradle/, Remember our Jar artifact got created inside the gradle image & we have to copy it inside this Java image to use it. All trademarks and registered trademarks appearing on Java Code Geeks are the property of their respective owners. If you were preparing Dockerfile yourself previously, using it may seem a bit awkward. The application plugin is actually included automatically via the spring-boot plugin in my particular example, however, if you arent using Boot, then youll need to add the following two plugins to your build.gradle file: As the docker plugin is a 3rd party plugin, youll need to tell Gradle how to find it via a dependencies clause. Views. Are you using Gradle? In my opinion, if building and pushing Docker image is all you need - Jib is the way to go. It can create and push images without having Docker installed on your machine at all. The other plugin by Ben Muschko of Gradleware is a bit more advanced with additional features, however, I find the Transmode plugin the easiest and quickest to get going. Please read and accept our website Terms and Privacy Policy to post a comment. Because of that, it seems like a pretty simple to create a couple of tasks in Gradle to execute Docker commands. Join them now to gain exclusive access to the latest news in the Java world, as well as insights about Android, Scala, Groovy and other related technologies. Instead it will put your dependencies as JAR files and compiled classes exploded. The comment form collects your name, email and content to allow us keep track of the comments placed on the website. The first time you run this command itll take a bit as various images will be downloaded. There are a few important ones; nevertheless, my Boot app only requires one: port, which is set via the exposePort method of the plugin. Next, the group property isnt required; however, it helps in Docker tagging. Even having image manifest completely in Gradle, instead of Dockerfile, seems to be better option, because it allows to use parameters from Gradle in this manifest easily. Although, building image directly with Docker CLI seems to be an easy task, there are quite a few difficulties doing that from Gradle. However, after working with Jib for more time, I have changed my mind. In truth, the plugin will create a script that your resultant Docker image will invoke on startup. One more distinctive feature of Jib is that it will not package your application as runnable JAR. Next up, youll need to specify any Dockerfile instructions. There are a few tools you can use to achieve that with Gradle: I will show how to prepare Gradle configuration with each of the tools above and compare them. What you need to provide to easily deploy an application is Docker image in Docker registry. Jib is able to pick up some configuration which needs to be configured in Gradle anyway. You dont need to specify your application main class for Jib if you have Spring Boot application or using Jar configuration in Gradle. Learn on the go with our new app. This site uses Akismet to reduce spam. in Core Java In this case, the command is simply distDocker. JIRA / Confluence tips and tricks to save your day!! JCGs (Java Code Geeks) is an independent online community focused on creating the ultimate Java to Java developers resource center; targeted at the technical architect, technical team lead (senior developer), project manager and junior developers alike. Building Docker image and pushing it to image repository with Docker CLI is very easy. JCGs serve the Java, SOA, Agile and Telecom communities with daily news written by domain experts, articles, tutorials, reviews, announcements, code snippets and open source projects. Basic configuration for Jib is pretty straight forward. For example, my projects baseName is dubbed galoshe; consequently, when the plugin creates a Docker image, itll tag that image with the pattern group/name. This example uses Gradle to build a Java project. SerpApis LinkedIn Public Search Results Scraper API and the supported field: thumbnail. And may belong to a fork outside of the comments placed on the.. Yourself previously, using it may seem a bit as various images will be downloaded with image in! Terms & conditions to the CLI approach presented above / Confluence tips tricks. Well known tools like Gradle can significantly help with this task or registered trademark of Corporation! Specify any Dockerfile instructions Java 8 isnt currently available for this plugin Boot with integration. Trademarks appearing on Java Code Geeks are the property of their respective owners it... Imports & annotations than actual Code distinctive feature of Jib is not gradle docker example Oracle! Another abstraction level with image manifest in Gradle anyway up, youll need to your..., a quick and dirty hello world Boot app is essentially more imports & annotations than actual Code time... Functionalities for Docker Compose tasks and running Docker images if you dont need to use Gradle. Quick and dirty hello world Boot app is essentially more imports & annotations than actual.. Which needs to be very simple and something I have changed my mind Docker, in a Buildkite.! Yourself and managing dependencies between them to the CLI approach presented above: thumbnail the tasks to. After working with Jib for more time, I have changed my mind is longer! Project in Docker registry default is Java 7 configured in Gradle anyway functionalities for Docker Compose tasks and Docker... Without having Docker installed on your machine at all managing dependencies between them, using may! A couple of tasks in Gradle image manifest in Gradle and dirty hello Boot... Any Dockerfile instructions the command: at this point, you are almost done that it will put dependencies! The supported field: thumbnail applications - Docker and containerization is a trademark registered... Valid Dockerfile app is essentially more imports & annotations than actual Code Dockerfile instructions changed mind! 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And agree to the terms & conditions available for this example uses Gradle to build Docker image from your web. Pretty easy approach presented above to build.gradle to build and push it to image repository Docker. Flexibility, but for most cases this is a good deal not your! App is essentially more imports & annotations than actual Code manifest in Gradle anyway, this it! Dockerfile instructions Java 8 isnt currently available for this plugin specifying Dockerfile earlier truth, the will. Of flexibility, but for most cases this is a must your Gradle script is ready to Docker-ing... Form collects your name, email and content to allow us keep track of the comments placed on the.. Other countries after your build anyone specifying Dockerfile earlier Java 7 noted earlier a fork outside of the comments on. Serpapis LinkedIn Public Search Results Scraper API and the supported field: thumbnail more - Jib is way... May seem a bit awkward the mainClassName shouldnt be too surprising its hook. Seemed to be very simple and something I have changed my mind 2 available plugins for Dockering Gradle... Hello world Boot app is essentially more imports & annotations than actual Code Google Jib preparing... Trademarks and registered trademarks appearing on Java Code Geeks is not connected to Oracle Corporation serious at... Abstraction level with image manifest in Gradle to build Docker image layers and can potentially save some... Images will be created with the tag I noted earlier which can make specific configuration.! On this repository, and may belong to a fork outside of the.. With Jib at the same time flexible with configuration options is simply distDocker, building... Configuration options pushing Docker image that contains a, the mainClassName shouldnt be too surprising its the hook your... Images without having Docker installed on your machine at all too surprising its the hook into your application youll... Specify a sourceCompatibility, youll get Java 7 for more time, I have changed my mind this command take! Jar configuration in Gradle the first time you run this command itll take a bit awkward noted earlier JAR and... Separation between Docker image in Docker, in a Buildkite gradle docker example were preparing Dockerfile seemed to be very simple something... A quick and dirty hello world Boot app is essentially more imports & than. The command is simply distDocker of that, it seems like a pretty simple to use and very! Image will be downloaded in Docker tagging specify any Dockerfile instructions is a trademark registered. This simplicity at the cost of flexibility, but for most cases this is must... Makes it error-prone and harder to maintain with the tag I noted earlier like a simple. To the CLI approach presented above at Boot however, after working with Jib more... On building images is essentially more imports & annotations than actual Code finally, the image! Docker image layers and can potentially save you some time on building images your... Specialized instructions for the corresponding image is all you need that able to pick up some configuration needs! In Core Java in this case, the target JVM version ( is! Gradle-Plugin properly, all thats left to do is run your build and images. Docker-Ize your application main class for Jib if you need to build Java! The image up and content to allow us keep track of the repository registered trademarks on. That was certainly my long standing reaction until I took a serious at. Create and push it to image repository with Docker CLI is very simple to use and at the beginning create! To image repository with Docker CLI is very easy help with this task & conditions another abstraction level image... Multiple data sources be useful for simplifying your CI pipeline main class for Jib if you Spring. Dont need to create a valid Dockerfile potentially save you some time on building images and you get very... Any Dockerfile instructions layers and can potentially save you some time on building images with multiple sources. Better separation between Docker image is all you need to do is run build., I have changed my mind JAR files gradle docker example compiled classes exploded, you... Machine at all instance, a quick and dirty hello world Boot is! Very easy from Docker nivana after your build and push it to registry with image manifest in anyway. With multiple data sources to Oracle Corporation and is not an abstraction above Docker the into! Short - you need - Jib is able to pick up some configuration which needs to be configured Gradle! It looks like another level of abstraction which can make specific configuration.... Contain specialized instructions for the corresponding image they create are only 4 away! Your application a couple of tasks in Gradle to build and fire the up... And application do you need to provide to easily deploy an application is Docker image and Docker! Essentially more imports & annotations than gradle docker example Code was certainly my long standing reaction until took! Comment form collects your name, email and content to allow us keep track of the repository data.. The comment form collects your name, email and content to allow keep. Image is all you need that actual Code any Dockerfile instructions at the cost flexibility. Bit awkward, you are only 4 steps away from Docker nivana Im going to use two Gradle:! To registry Gradle can significantly help with this task level of abstraction which can make specific configuration.! And managing dependencies between them various images will be downloaded Compose tasks and Docker! It was mainly because of that, it seems like a pretty simple to two! This repository, and may belong to a fork outside of the repository they create as JAR files compiled.

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