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This article mainly explains the "Java containerization tool Jib has what function", the content of the article is simple and clear, easy to learn and understand, now please follow the editor's train of thought slowly in depth, together to study and learn "what is the function of Java containerization tool Jib"!

The advent of containers brings Java developers closer to the "write once, run everywhere" workflow than ever before, but containerization of Java applications is not easy: you have to write Dockerfile, run the Docker daemon as root, wait for the build to complete, and finally push the image to the remote registry. But not all Java developers are container experts, so are the days when you only need to build a JAR package as before are over?

To meet this challenge, Google has opened up a Java containerization tool, Jib, with which Java developers can use the Java tool they are familiar with to build containers. Jib is a fast and simple container image building tool that handles all the steps required to package an application into a container image. It doesn't require you to write Dockerfile or install Docker, and it can be integrated directly into Maven and Gradle-you can instantly containerize Java applications by adding plug-ins to your build.

Docker build process:

Jib build process:

How Jib makes Development better

Jib takes advantage of the layered mechanism of Docker image, integrates it with the construction system, and optimizes the construction of Java container image in the following ways:

Simple-Jib is developed using Java and runs as part of Maven or Gradle. You don't need to write Dockerfile or run the Docker daemon, or even create a large JAR package that contains all the dependencies. Because Jib is tightly integrated with the Java build process, it has access to all the information needed to package the application. During subsequent container builds, it automatically selects any variants that have been built by Java.

Fast-Jib uses mirror layering and registry caching for fast, incremental builds. It reads your build configuration, organizes your application into different layers (dependencies, resources, classes), and rebuilds and pushes only the layers that have changed. When the project iterates quickly, Jib only talks about pushing the changed layer (not the entire application) to the registry to save valuable build time.

Reproducibility-Jib supports declarative container image construction based on the build metadata of Maven and Gradle, so as long as the input remains the same, the same image can be created repeatedly through configuration.

How to use Jib to containerize your application

Jib can be used as a plug-in for Maven and Gradle, and requires minimal configuration. Simply add the plug-in to the build definition and configure the target image. If you want to push the image to a private registry, configure the required key for Jib. The easiest way is to use a credential assistant such as docker-credential-gcr. Jib also provides other rules for building images into the Docker daemon.

Use Jib in Maven:

Com.google.cloud.tools jib-maven-plugin 0.9.0 gcr.io/my-project/image-built-with-jib # Builds to a container image registry.$ mvn compile jib:build# Builds to a Docker daemon.$ mvn compile jib:dockerBuild

Use Jib in Gradle:

Plugins {id 'com.google.cloud.tools.jib' version' 0.9.0'} jib.to.image = 'gcr.io/my-project/image-built-with-jib'# Builds to a container image registry.$ gradle jib# Builds to a Docker daemon.$ gradle jibDockerBuild Thank you for reading. That's what the Java containerization tool Jib has. After the study of this article, I believe that you have a deeper understanding of the function of Java containerization tool Jib, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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