Gradle SpringBoot 2.4.2 using bootBuildImage with tag

Question

I am trying to use gradle SpringBoot plugin version 2.4.2 in a project and build a docker image using bootBuildImage task. when i try o build docker image with a tag that containes slash the build will fail because the slash is not allowed in the tag i guess.

Her is a snipt of the customized gradle bootBuildImage in my project gradle file:

bootBuildImage { imageName = "hello-world:${art_contextUrl}/docker-repo" publish = false docker { publishRegistry { username = "${art_user}" password = "${art_password}" url = "${art_contextUrl}/docker-repo" } }

}

The tag is consisted of context url of repository / repository. But the task will fail. If i use simple tag lik 0.0.1 the task will complite and a docker image will be created.

How do I tag the image correctly without using docker tag command, i mean just taging from the bootBuildImage task

Bjørn Vester · Accepted Answer · 2021-02-02 09:16:54Z

From the documentation:

A tag name must be valid ASCII and may contain lowercase and uppercase letters, digits, underscores, periods and dashes. A tag name may not start with a period or a dash and may contain a maximum of 128 characters.

So no, you can't use slashes in a tag.

This is correct. If you try to use that tag with docker tag you will get an error like is not a valid repository/tag: invalid reference format. Spring Boot attempts to enforce Docker image name rules.

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