How to build the docker image using jib-maven-plugin, but not push by default?

Question

I have a simple SpringBoot application and I want to build docker image using Jib Maven plugin. Following is my plugin configuration:

<plugin>
    <groupId>com.google.cloud.tools</groupId>
    <artifactId>jib-maven-plugin</artifactId>
    <version>2.1.0</version>
    <configuration>
        <from>
            <image>openjdk:11-jdk-slim</image>
        </from>
        <to>
            <image>username/appname</image>
            <tags>
                <tag>latest</tag>
                <tag>${project.version}</tag>
            </tags>
        </to>
        <container>
            <mainClass>demo.Application</mainClass>
            <ports>
                <port>8080</port>
                <port>8787</port>
            </ports>
        </container>
    </configuration>
</plugin>

I just want to build the image locally and run it. I don't want to build and push to docker registry in one go.

When I run the command mvn jib:build it is automatically getting pushed to DockerHub using my credentials from Docker config (/Users/username/.docker/config.json).

Is there a way I can disable push and another goal just to push the image to registry?

Answer 1

Since you said jib:dockerBuild is not an option, the closest workaround is jib:buildTar; the goal creates a local tarball at target/jib-image.tar (path configurable with <outputPaths><tar>). Running jib:buildTar (or any jib:... goals) for the first time will build and cache everything necessary to build an image. Therefore, subsequent jib:build runs will be no-op in terms of building layers. It will only need to send layers missing in a remote registry.

Of course, one downside of the workaround is that it creates an unnecessary tarball, which may be large.

---

Unrelated to you question, you don't need to set <tag>latest</tag>, because the target image reference <image>username/appname<image> already implies <image>username/appname:latest<image>. The <tags> configuration is for pushing additional tags on top of <to><iamge>.