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
<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>
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
➜ 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!
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
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
确定是32768端口。
第四步：浏览器中输入http://localhost:32768/hello,看到结果
image.png
说明我们访问容器内的程序成功了！
下节将的内容是：SpringBoot基础教程(十七)——与日志的结合
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