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
          
        
      
    
  

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
      
    
  

接着先编译出Java class,命令如下:

$ mvn clean package

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

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

执行如下:

$ ./Pkslow.SpringbootGraalVMNativeMain

Spring Native打包本地镜像,无需通过Graal的maven插件buildtools_第1张图片

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-graalvm
HTTP/1.1 200 
Content-Type: text/plain;charset=UTF-8
Content-Length: 67
Date: Wed, 02 Nov 2022 15:08:44 GMT

This message is from Spring Boot built/run by GraalVM/Spring Native

创建Docker镜像

先拉取基础镜像:

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

进入容器看一下里面的状况:

$ docker run -it --rm --entrypoint bash springci/graalvm-ce:java11-0.12.x
root@d9b54bdce70a:/# pwd
/
root@d9b54bdce70a:/# java --version
openjdk 11.0.15 2022-04-19
OpenJDK 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/java
root@d9b54bdce70a:/# which native-image
/opt/java/bin/native-image

准备一下Dockerfile如下:

FROM springci/graalvm-ce:java11-0.12.x
VOLUME /tmp

ARG PORT=8080
ARG TIME_ZONE=Asia/Shanghai

ENV TZ=${TIME_ZONE}
EXPOSE ${PORT}
RUN pwd

RUN mkdir /pkslow-application
WORKDIR /pkslow-application/
RUN cd /pkslow-application
COPY 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.SpringbootGraalVMNativeMain


ENTRYPOINT ["/pkslow-application/Pkslow.SpringbootGraalVMNativeMain"]

打包Docker镜像:

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

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-SNAPSHOT
2022-11-02 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: default
2022-11-02 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 WebApplicationContext
2022-11-02 23:48:40.940  INFO 1 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 19 ms
2022-11-02 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

测试正常启动:

$ curl -i http://127.0.0.1:8080/hi-graalvm
HTTP/1.1 200 
Content-Type: text/plain;charset=UTF-8
Content-Length: 67
Date: Wed, 02 Nov 2022 15:49:05 GMT

This message is from Spring Boot built/run by GraalVM/Spring Native

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
        
      
    
  

通过以下命令即可生成Docker镜像:

$ mvn clean install -Ddocker.skip=false

代码

代码请看GitHub: https://github.com/LarryDpk/p...

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