Question 81123 in Docker Question posted in
The official documentation can be found here.

how to set micronaut to generate docker images

I’m new to gradle kotlin and micronaut. by following the official guide create your first micronaut app gradle kotlin I made it run OK on my mac M1, but the task to generate the docker image fails:

Could not build image: no matching manifest for linux/arm64/v8 in the manifest list entries

this is expected I guess: by looking at the generated Dockerfile this is what I get:

FROM openjdk:17-alpine
WORKDIR /home/app
COPY layers/libs /home/app/libs
COPY layers/classes /home/app/classes
COPY layers/resources /home/app/resources
COPY layers/application.jar /home/app/application.jar
EXPOSE 8080
ENTRYPOINT ["java", "-jar", "/home/app/application.jar"]

so an explicit platform should be specified along with the FROM.
If I got it right, micronaut’s plugin uses Gradle Docker Plugin, but I’m not finding the right piece of instruction to override the original from assertion that it generates.

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2

Answers


  1. 0

    Following the documentation:

    The default uses an openjdk:17-alpine base image, however you can easily switch the base image to use by using the baseImage property of the dockerfile task:

    tasks.named("dockerfile") {
 baseImage = "oracle/graalvm-ce:22.2.0-java11"
}
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  2. 0

    The problem with the default settings of the Micronaut Gradle plugin is, that it uses openjdk:17-alpine as a base image. This image is only available for amd64 architectures. Your M1 Mac would like aarch64.

    Here is how I solved the problem with my projects.

    tasks.named("dockerfile") {
    baseImage = "eclipse-temurin:17.0.5_8-jre-jammy"
}

    This will work on aarch64 (aka arm64) and amd64.

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