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目录
前言
Docker大部分应用在提供一些基础设施，如Redis/Mongo/Mysql等，本文主要讲述将自己编写的Springboot应用程序打包成docker镜像分发出去
什么是Docker镜像
掌握核心四点
- 它是一个静态的只读模板
- 它包含构建
Docker容器的指令 - 它是分层的
- 它通过
Dockerfile来创建镜像
Dockerfile常用命令快查表
| 命令 | 作用 | 例子 |
|---|---|---|
| FROM | 基于什么镜像 | FROM |
| LABEL | 设置标签 | LABEL maintainer="Geektime" |
| RUN | 运行安装命令 | RUN ["executable", "param1", "param2"] |
| CMD | 容器启动时命令(只能有一个) | CMD ["executable", "param1", "param2"] |
| ENTRYPOINT | 容器启动后命令(只能有一个) | ENTRYPOINT ["executable", "param1", "param2"] |
| VOLUME | 挂载命令 | VOLUME ["/data"] |
| EXPOSE | 容器监听端口 | EXPOSE [/] |
| ENV | 设置环境变量 | ENV |
| ADD | 添加文件 | ADD [--chown=:] ... |
| WORKDIR | 设置运行工作目录 | WORKDIR /path/to/workdir |
| USER | 设置运行用户 | USER [:] |
Maven构建Docker镜像-三步曲
1.准备工作
- 来看下
Dockerfile文件
FROM java:8
EXPOSE 8080
ARG JAR_FILE
ADD target/${JAR_FILE} /waiter-service.jar
ENTRYPOINT ["java", "-jar","/waiter-service.jar"]
- 再看下
pox.xml核心部分，配置dockerfile-maven-plugin
<plugin>
<groupId>com.spotify</groupId>
<artifactId>dockerfile-maven-plugin</artifactId>
<version>1.4.10</version>
<executions>
<execution>
<id>default</id>
<goals>
<goal>build</goal>
<goal>push</goal>
</goals>
</execution>
</executions>
<configuration>
<repository>${docker.image.prefix}/${project.artifactId}</repository>
<tag>${project.version}</tag>
<buildArgs>
<JAR_FILE>${project.build.finalName}.jar</JAR_FILE>
</buildArgs>
</configuration>
</plugin>
2.执行构建
- 通过
maven命令来打包生成镜像
$ mvn clean package -Dmaven.test.skip=true
[INFO] Scanning for projects...
[INFO]
[INFO] -------------< geektime.spring.springbucks:waiter-service >-------------
[INFO] Building waiter-service 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
...
...
...
[INFO] Step 2/5 : EXPOSE 8080
[INFO]
[INFO] ---> Running in 6ae617f0acdf
[INFO] Removing intermediate container 6ae617f0acdf
[INFO] ---> 6b182f57247c
[INFO] Step 3/5 : ARG JAR_FILE
[INFO]
[INFO] ---> Running in 9a25b1d1b38c
[INFO] Removing intermediate container 9a25b1d1b38c
[INFO] ---> 863117cd06f4
[INFO] Step 4/5 : ADD target/${JAR_FILE} /waiter-service.jar
[INFO]
[INFO] ---> 064b021fac28
[INFO] Step 5/5 : ENTRYPOINT ["java", "-jar","/waiter-service.jar"]
[INFO]
[INFO] ---> Running in c8b3c173ebad
[INFO] Removing intermediate container c8b3c173ebad
[INFO] ---> 85fd7a4f7f3d
[INFO] Successfully built 85fd7a4f7f3d
[INFO] Successfully tagged springbucks/waiter-service:0.0.1-SNAPSHOT
[INFO]
[INFO] Detected build of image with id 85fd7a4f7f3d
[INFO] Building jar: /Users/lidean/gitee/geektime-spring-family/Chapter 10/docker-demo/target/waiter-service-0.0.1-SNAPSHOT-docker-info.jar
[INFO] Successfully built springbucks/waiter-service:0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 07:18 min
[INFO] Finished at: 2021-06-07T10:35:33+08:00
[INFO] ------------------------------------------------------------------------
可以看到已经构建完了
3.检查结果
我们来看下打包好的镜像是否部署成功
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
springbucks/waiter-service 0.0.1-SNAPSHOT 85fd7a4f7f3d About a minute ago 683MB
通过docker run来执行镜像，再通过docker logs可以看到它还在启动
$ docker run --name waiter-service -d -p 8080:8080 springbucks/waiter-service:0.0.1-SNAPSHOT
28eba6685144634016d7e73c22000265aa14713276242505684e7eb62241954e
$ docker logs waiter-service
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.3.RELEASE)
2021-06-07 06:36:36.084 INFO 1 --- [ main] g.s.s.waiter.WaiterServiceApplication : Starting WaiterServiceApplication v0.0.1-SNAPSHOT on 28eba6685144 with PID 1 (/waiter-service.jar started by root in /)
2021-06-07 06:36:36.101 INFO 1 --- [ main] g.s.s.waiter.WaiterServiceApplication : No active profile set, falling back to default profiles: default
2021-06-07 06:36:38.937 INFO 1 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2021-06-07 06:36:39.323 INFO 1 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 344ms. Found 2 repository interfaces.
2021-06-07 06:36:41.811 INFO 1 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$f2e71ce] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-06-07 06:36:43.553 INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2021-06-07 06:36:43.683 INFO 1 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-06-07 06:36:43.684 INFO 1 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.16]
2021-06-07 06:36:43.727 INFO 1 --- [ main] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib]
2021-06-07 06:36:44.205 INFO 1 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-06-07 06:36:44.206 INFO 1 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 7871 ms
2021-06-07 06:36:44.727 INFO 1 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2021-06-07 06:36:45.430 INFO 1 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2021-06-07 06:36:46.171 INFO 1 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2021-06-07 06:36:46.770 INFO 1 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.3.7.Final}
2021-06-07 06:36:46.775 INFO 1 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2021-06-07 06:36:47.578 INFO 1 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2021-06-07 06:36:49.212 INFO 1 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
2021-06-07 06:36:52.227 INFO 1 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2021-06-07 06:36:55.609 INFO 1 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2021-06-07 06:36:55.815 WARN 1 --- [ main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2021-06-07 06:36:56.808 INFO 1 --- [ main] o.s.b.a.e.web.EndpointLinksResolver : Exposing 15 endpoint(s) beneath base path '/actuator'
2021-06-07 06:36:57.082 INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2021-06-07 06:36:57.089 INFO 1 --- [ main] g.s.s.waiter.WaiterServiceApplication : Started WaiterServiceApplication in 22.508 seconds (JVM running for 24.292)
再检查下是否运行成功了，可以看到已经成功运行并映射到对应端口了
$ docker ps | grep springbucks/waiter-service:0.0.1-SNAPSHOT
28eba6685144 springbucks/waiter-service:0.0.1-SNAPSHOT "java -jar /waiter-s…" 3 minutes ago Up 3 minutes 0.0.0.0:8080->8080/tcp waiter-service
最后，我们访问下实际端口，看是否返回对应数据
$ curl http://127.0.0.1:8080/coffee/1
{
"id" : 1,
"createTime" : "2021-06-07T14:36:45.551+0800",
"updateTime" : "2021-06-07T14:36:45.551+0800",
"name" : "espresso",
"price" : 20.00
}%
扩展
dockerfile-maven-plugin也提供了一些辅助的方法，可以通过deploy到我指定的仓库里面。
可以尝试本地构建一个自己的 docker 镜像仓库 push 上去
