带/cnb的构建包2.3.0.M3 :仿生缓存jdk，无需在每次运行时下载

Question

我有一个spring-boot gradle REST应用程序，希望用https://buildpacks.io/ pack创建一个与OCI一致的映像。

pack -v build minimal_rest --builder cloudfoundry/cnb:bionic

在任何执行过程中，它都会重新下载jdk作为“对层的贡献”。

===> BUILDING
[builder]
[builder] Cloud Foundry OpenJDK Buildpack v1.2.14
[builder]   OpenJDK JDK 11.0.6: Contributing to layer
[builder]     Downloading from https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-11.0.6%!B(MISSING)10/OpenJDK11U-jdk_x64_linux_hotspot_11.0.6_10.tar.gz

有没有一种方法来“缓存”贡献层，这样它们就不会在每次运行时被重新下载？

+：

我在org.springframework.boot插件中使用了spring 2.3.0.M3和gradle 6.2.1 (也是v2.3.0.M3)。

打电话

./gradlew clean build -x test bootBuildImage

使用

tasks {
    bootJar {
        val archivesBaseName: String by project.extra
        archiveBaseName.set(archivesBaseName)
        manifest {
            attributes["Implementation-Title"] = project.name
            attributes["Implementation-Version"] = v.version
            attributes["provider"] = "gradle"
        }
    }
    bootBuildImage {
        builder = "cloudfoundry/cnb:bionic"
        val archivesBaseName: String by project.extra
        imageName = archivesBaseName
    }
}

我终于得到了：

Execution failed for task ':bootBuildImage'.
> Detected platform API version 'v0.3' is not included in supported versions 'v0.1,v0.2'

但是使用cloudfoundry/cnb:只有2天的仿生(2020年3月20日)

对此也有什么想法吗？

Answer 1

因此，我得到了他们松懈的渠道的答案(至少在第一部分)。

在和--clear-cache进行了一次无过失的跑步之后.pack现在缓存jdk，并且不会在每次运行时下载jdk。(在连续运行时肯定不会传递--清除缓存)

此外，在您的项目根dir中，您可以问pack本身它“推荐”了哪些构建者：

$ pack suggest-builders
Suggested builders:
    Cloud Foundry:     cloudfoundry/cnb:bionic         Ubuntu bionic base image with buildpacks for Java, NodeJS and Golang
    Cloud Foundry:     cloudfoundry/cnb:cflinuxfs3     cflinuxfs3 base image with buildpacks for Java, .NET, NodeJS, Python, Golang, PHP, HTTPD and NGINX
    Cloud Foundry:     cloudfoundry/cnb:tiny           Tiny base image (bionic build image, distroless run image) with buildpacks for Golang
    Heroku:            heroku/buildpacks:18            heroku-18 base image with buildpacks for Ruby, Java, Node.js, Python, Golang, & PHP

Tip: Learn more about a specific builder with:
    pack inspect-builder [builder image]