SpringBootアプリをjibでDocker化する

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Google製のJavaをdocker化してくれるアプリでSpringBootのデモアプリをDocker化する

buildscript {
    ext {
        springBootVersion = '2.0.3.RELEASE'
    }
    repositories {
        mavenCentral()
        maven {
            url "https://plugins.gradle.org/m2/"
        }
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
        classpath "gradle.plugin.com.google.cloud.tools:jib-gradle-plugin:0.9.8"
    }
}

group = 'net.kosasaki.example'
version = '0.0.1-SNAPSHOT'

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'
apply plugin: 'com.google.cloud.tools.jib'

dependencies {
        compile('org.springframework.boot:spring-boot-starter-webflux')
        compile('org.springframework.boot:spring-boot-starter-thymeleaf')
        compileOnly('org.projectlombok:lombok:1.18.0')
        compile 'mysql:mysql-connector-java:6.0.6'  
}

jib {
        from {
                image = 'adoptopenjdk/openjdk8:alpine-slim'
        }
        to {
                image = 'sample/jib-demo-app'
        }
        container {
                jvmFlags = ['-Xms512m', '-Xdebug']
                mainClass = 'net.kosasaki.example.WebApplication'
                args = []
                ports = ['8080/tcp']
                useCurrentTimestamp = true
        }

}

build.gradleはこんな感じ。

$ ./gradlew jibDockerBuild

docker images でイメージを確認する

$ docker images
REPOSITORY                                                         TAG                 IMAGE ID            CREATED             SIZE
sample/jib-demo-app                                                latest              891911ccd0de        About a minute ago   133MB

イメージ作成できてました。簡単すぎる。

イメージを実行して確認する

$ docker run --rm -it -p 8080:8080 --name jib-demo-app sample/jib-demo-app

Picked up JAVA_TOOL_OPTIONS