最近一段时间，容器化成为了一种趋势。一台服务器可以虚拟成多个容器，同时提供服务，共享硬件资源，节约成本，容器化的翘楚就是docker，我司的所有微服务的发布都已经容器化。spring boot 也紧跟潮流，加入了docker的maven插件，可以通过执行命令来制作镜像。
本节的主要内容不是讲代码，而是讲这个docker插件。废话不多说，上pom
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<plugin>
<groupid>com.spotify</groupid>
<artifactid>docker-maven-plugin</artifactid>
<version>0.4.12</version>
<configuration>
<!-- 注意imagename一定要是符合正则[a-z0-9-_.]的，否则构建不会成功 -->
<!-- 详见：https://github.com/spotify/docker-maven-plugin invalid repository name ... only [a-z0-9-_.] are allowed-->
<imagename>spring-boot-docker-start</imagename>
<!--相当于from java,本地有使用本地的镜像，没有的话从远程仓库拉取-->
<baseimage>java</baseimage>
<exposes>
<!--暴露容器内的8080端口-->
<expose>8080</expose>
</exposes>
<!--进入点，执行的命令-->
<entrypoint>["java", "-jar", "/${project.build.finalname}.jar"]</entrypoint>
<resources>
<resource>
<targetpath>/</targetpath>
<directory>${project.build.directory}</directory>
<include>${project.build.finalname}.jar</include>
</resource>
</resources>
</configuration>
</plugin>
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imagename就是镜像的名称。baseimage是基础镜像，本地有使用本地的镜像，没有的话从远程仓库拉取，暴露容器内的8080端口，执行java -jar 命令，启动微服务。我们知道使用docker需要制定dockerfile文件，里面的元素完全通过maven插件的标签来体现了。还是有前提的，你得先安装好docker。讲解到这里，我们开始运行
第一步：执行mvn clean package docker:build创建生成镜像。
第二步：启动镜像docker run -it -p spring-boot-docker-start,看下容器内的日志
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➜ spring-boot-docker-start git:(master) docker run -it -p spring-boot-docker-start
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: spring boot :: (v1.3.5.release)
2018-03-25 08:41:56.274 info 1 --- [ main] com.shuqi.applicationmain : starting applicationmain on 075543f8f5b6 with pid 1 (/spring-boot-docker-start.jar started by root in /)
2018-03-25 08:41:56.287 info 1 --- [ main] com.shuqi.applicationmain : no active profile set, falling back to default profiles: default
2018-03-25 08:41:56.406 info 1 --- [ main] ationconfigembeddedwebapplicationcontext : refreshing org.springframework.boot.context.embedded.annotationconfigembeddedwebapplicationcontext@126d28d3: startup date [sun mar 25 08:41:56 utc 2018]; root of context hierarchy
2018-03-25 08:41:58.356 info 1 --- [ main] s.b.c.e.t.tomcatembeddedservletcontainer : tomcat initialized with port(s): 8080 (http)
2018-03-25 08:41:58.382 info 1 --- [ main] o.apache.catalina.core.standardservice : starting service tomcat
2018-03-25 08:41:58.384 info 1 --- [ main] org.apache.catalina.core.standardengine : starting servlet engine: apache tomcat/8.0.33
2018-03-25 08:41:58.512 info 1 --- [ost-startstop-1] o.a.c.c.c.[tomcat].[localhost].[/] : initializing spring embedded webapplicationcontext
2018-03-25 08:41:58.512 info 1 --- [ost-startstop-1] o.s.web.context.contextloader : root webapplicationcontext: initialization completed in 2113 ms
2018-03-25 08:41:58.920 info 1 --- [ost-startstop-1] o.s.b.c.e.servletregistrationbean : mapping servlet: 'dispatcherservlet' to [/]
2018-03-25 08:41:58.928 info 1 --- [ost-startstop-1] o.s.b.c.embedded.filterregistrationbean : mapping filter: 'characterencodingfilter' to: [/*]
2018-03-25 08:41:58.937 info 1 --- [ost-startstop-1] o.s.b.c.embedded.filterregistrationbean : mapping filter: 'hiddenhttpmethodfilter' to: [/*]
2018-03-25 08:41:58.937 info 1 --- [ost-startstop-1] o.s.b.c.embedded.filterregistrationbean : mapping filter: 'httpputformcontentfilter' to: [/*]
2018-03-25 08:41:58.938 info 1 --- [ost-startstop-1] o.s.b.c.embedded.filterregistrationbean : mapping filter: 'requestcontextfilter' to: [/*]
2018-03-25 08:41:59.406 info 1 --- [ main] s.w.s.m.m.a.requestmappinghandleradapter : looking for @controlleradvice: org.springframework.boot.context.embedded.annotationconfigembeddedwebapplicationcontext@126d28d3: startup date [sun mar 25 08:41:56 utc 2018]; root of context hierarchy
2018-03-25 08:41:59.516 info 1 --- [ main] s.w.s.m.m.a.requestmappinghandlermapping : mapped "{[/hello],methods=[get]}" onto public java.lang.string com.shuqi.controller.hellocontroller.hello()
2018-03-25 08:41:59.523 info 1 --- [ main] s.w.s.m.m.a.requestmappinghandlermapping : mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.modelandview org.springframework.boot.autoconfigure.web.basicerrorcontroller.errorhtml(javax.servlet.http.httpservletrequest,javax.servlet.http.httpservletresponse)
2018-03-25 08:41:59.524 info 1 --- [ main] s.w.s.m.m.a.requestmappinghandlermapping : mapped "{[/error]}" onto public org.springframework.http.responseentity<java.util.map<java.lang.string, java.lang.object>> org.springframework.boot.autoconfigure.web.basicerrorcontroller.error(javax.servlet.http.httpservletrequest)
2018-03-25 08:41:59.584 info 1 --- [ main] o.s.w.s.handler.simpleurlhandlermapping : mapped url path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.resourcehttprequesthandler]
2018-03-25 08:41:59.585 info 1 --- [ main] o.s.w.s.handler.simpleurlhandlermapping : mapped url path [/**] onto handler of type [class org.springframework.web.servlet.resource.resourcehttprequesthandler]
2018-03-25 08:41:59.645 info 1 --- [ main] o.s.w.s.handler.simpleurlhandlermapping : mapped url path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.resourcehttprequesthandler]
2018-03-25 08:41:59.754 info 1 --- [ main] o.s.j.e.a.annotationmbeanexporter : registering beans for jmx exposure on startup
2018-03-25 08:41:59.834 info 1 --- [ main] s.b.c.e.t.tomcatembeddedservletcontainer : tomcat started on port(s): 8080 (http)
2018-03-25 08:41:59.838 info 1 --- [ main] com.shuqi.applicationmain : started applicationmain in 4.084 seconds (jvm running for 5.012)
[2018-03-25 08:41:59] server started!
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启动成功。
第三步：输入docker ps看看容器内的8080端口被映射到了本机的哪个端口
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container id image command created status ports names
075543f8f5b6 spring-boot-docker-start "java -jar /spring..." about a minute ago up about a minute 0.0.0.0:32768->8080/tcp trusting_noether
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确定是32768端口。
第四步：浏览器中输入http://localhost:32768/hello,看到结果
说明我们访问容器内的程序成功了！
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://www.jianshu.com/p/f999eeef3756