Spring Native打包本地镜像，无需通过Graal的maven插件buildtools

简介

在文章《GraalVM和Spring Native尝鲜，一步步让Springboot启动飞起来，66ms完成启动》中，我们介绍了如何使用Spring Native和buildtools插件，打包出本地镜像，也打包成Docker镜像。本文探索一下，如果不通过这个插件来生成镜像。这样我们可以控制更多、了解更多。

创建Spring Boot项目

创建Spring Boot项目，引入Spring Native，我们主要使用的是Spring Native提供的AOT功能。如下：

org.springframework.experimental spring-native ${spring-native.version} org.springframework.boot spring-boot-starter-web org.springframework.experimental spring-aot-maven-plugin ${spring-native.version} test-generate test-generate generate generate 复制代码

Build image的时候，我们需要引用依赖库，所以加上下面的插件：

maven-dependency-plugin package copy-dependencies ${project.build.directory}/lib 复制代码

接着先编译出Java class，命令如下：

$ mvn clean package复制代码打包本地镜像

前面的命令打包完，在target目录下会有一个lib目录，我们需要用上。通过native-image命令来生成镜像，如下：

$ native-image -cp ./target/classes/:target/lib/* com.pkslow.springboot.SpringbootGraalVMNativeMain Pkslow.SpringbootGraalVMNativeMain复制代码

这样就会生成一个可执行文件：Pkslow.SpringbootGraalVMNativeMain

执行如下：

$ ./Pkslow.SpringbootGraalVMNativeMain复制代码

使用了93ms来启动，还是很快的。

访问服务是正常的：

$ curl -i http://localhost:8080/hi-graalvmHTTP/1.1 200 Content-Type: text/plain;Content-Length: 67Date: Wed, 02 Nov 2022 15:08:44 GMTThis message is from Spring Boot built/run by GraalVM/Spring Native复制代码创建Docker镜像

先拉取基础镜像：

$ docker pull springci/graalvm-ce:java11-0.12.x复制代码

进入容器看一下里面的状况：

$ docker run -it –rm –entrypoint bash springci/graalvm-ce:java11-0.12.xroot@d9b54bdce70a:/# pwd/root@d9b54bdce70a:/# java –versionopenjdk 11.0.15 2022-04-19OpenJDK Runtime Environment GraalVM 22.1.1.0-dev (build 11.0.15+10-jvmci-22.1-b06)OpenJDK 64-Bit Server VM GraalVM 22.1.1.0-dev (build 11.0.15+10-jvmci-22.1-b06, mixed mode, sharing)root@d9b54bdce70a:/# which java/opt/java/bin/javaroot@d9b54bdce70a:/# which native-image/opt/java/bin/native-image复制代码

准备一下Dockerfile如下：

FROM springci/graalvm-ce:java11-0.12.xVOLUME /tmpARG PORT=8080ARG TIME_ZONE=Asia/ShanghaiENV TZ=${TIME_ZONE}EXPOSE ${PORT}RUN pwdRUN mkdir /pkslow-applicationWORKDIR /pkslow-application/RUN cd /pkslow-applicationCOPY target/classes/ /pkslow-application/classes/COPY target/lib/ /pkslow-application/lib/RUN native-image -cp /pkslow-application/classes/:/pkslow-application/lib/* \ com.pkslow.springboot.SpringbootGraalVMNativeMain \ Pkslow.SpringbootGraalVMNativeMainENTRYPOINT [“/pkslow-application/Pkslow.SpringbootGraalVMNativeMain”]复制代码

打包Docker镜像：

$ docker build . -t pkslow/spring-boot-native-without-buildtools:1.0-SNAPSHOT -f src/main/dker/Dockerfile复制代码

完成后通过下面命令启动，57ms完成启动：

$ docker run -it -p 8080:8080 –rm pkslow/spring-boot-native-without-buildtools:0-SNAPSHOT2022-11-02 23:48:40.918 INFO 1 — [ main] o.s.nativex.NativeListener : AOT mode enabled . ____ _ __ _ _ /\\ / ___’_ __ _ _(_)_ __ __ _ \ \ \ \( ( )\___ | ‘_ | ‘_| | ‘_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ‘ |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.6.2)2022-11-02 23:48:40.920 INFO 1 — [ main] c.p.s.SpringbootGraalVMNativeMain : Starting SpringbootGraalVMNativeMain using Java 11.0.15 on 12528bd45fd7 with PID 1 (/pkslow-application/Pkslow.SpringbootGraalVMNativeMain started by root in /pkslow-application)2022-11-02 23:48:40.920 INFO 1 — [ main] c.p.s.SpringbootGraalVMNativeMain : No active profile set, falling back to default profiles: default2022-11-02 23:48:40.934 INFO 1 — [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)2022-11-02 23:48:40.935 INFO 1 — [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]2022-11-02 23:48:40.935 INFO 1 — [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.56]2022-11-02 23:48:40.940 INFO 1 — [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext2022-11-02 23:48:40.940 INFO 1 — [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 19 ms2022-11-02 23:48:40.963 INFO 1 — [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ”2022-11-02 23:48:40.964 INFO 1 — [ main] c.p.s.SpringbootGraalVMNativeMain : Started SpringbootGraalVMNativeMain in 0.057 seconds (JVM running for 0.061)2022-11-02 23:48:57.098 INFO 1 — [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet ‘dispatcherServlet’2022-11-02 23:48:57.098 INFO 1 — [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet ‘dispatcherServlet’2022-11-02 23:48:57.098 INFO 1 — [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 0 ms复制代码

测试正常启动：

$ curl -i http://127.0.0.1:8080/hi-graalvmHTTP/1.1 200 Content-Type: text/plain;charset=UTF-8Content-Length: 67Date: Wed, 02 Nov 2022 15:49:05 GMTThis message is from Spring Boot built/run by GraalVM/Spring Native复制代码

为了集成打包镜像到CI/CD中，在pom添加以下插件：

org.codehaus.mojo exec-maven-plugin 3.0.0 install exec ${docker.skip} docker build . -t pkslow/${project.artifactId}:${project.version} -f src/main/docker/Dockerfile 复制代码

通过以下命令即可生成Docker镜像：

$ mvn clean install -Ddocker.skip=false复制代码代码

代码请看GitHub: github.com/LarryDpk/pk…