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
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...