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Spring Native打包本地镜像
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：
<dependencies>
<dependency>
<groupId>org.springframework.experimental</groupId>
<artifactId>spring-native</artifactId>
<version>${spring-native.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.experimental</groupId>
<artifactId>spring-aot-maven-plugin</artifactId>
<version>${spring-native.version}</version>
<executions>
<execution>
<id>test-generate</id>
<goals>
<goal>test-generate</goal>
</goals>
</execution>
<execution>
<id>generate</id>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
Build image的时候，我们需要引用依赖库，所以加上下面的插件：
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>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
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：
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<phase>install</phase>
<goals>
<goal>exec</goal>
</goals>
<configuration>
<skip>${docker.skip}</skip>
<executable>docker</executable>
<arguments>
<argument>build</argument>
<argument>.</argument>
<argument>-t</argument>
<argument>pkslow/${project.artifactId}:${project.version}</argument>
<argument>-f</argument>
<argument>src/main/docker/Dockerfile</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>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/pkslow-samples
到此这篇关于Spring Native打包本地镜像，无需通过Graal的maven插件buildtools的文章就介绍到这了,更多相关Spring Native打包本地镜像内容请搜索码农之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持码农之家！
