spring boot docker 初尝试

Docker服务中进程间通信通过/var/run/docker.sock实现，默认服务不提供监听端口，因此使用docker remote api 需要手动绑定端口。

在centos7.2下，可以进行这样的操作：
直接在ExecStart=/usr/bin/dockerd后面增加需要的启动参数即可。我这里增加了DockerHub镜像加速地址和开启了tcp连接（--registry-mirror=https://xxoo.mirror.acs.aliyun.com -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock）
vim /etc/systemd/system/docker.service
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

systemctl daemon-reload
systemctl restart docker

实际操作：

[root@localhost frinder]# vi /usr/lib/systemd/system/docker.service
在：ExecStart=/usr/bin/dockerd-current 后面追加：-H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

[root@localhost frinder]# cat /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=network.target
Wants=docker-storage-setup.service
Requires=docker-cleanup.timer

[Service]
Type=notify
NotifyAccess=all
EnvironmentFile=-/etc/sysconfig/docker
EnvironmentFile=-/etc/sysconfig/docker-storage
EnvironmentFile=-/etc/sysconfig/docker-network
Environment=GOTRACEBACK=crash
Environment=DOCKER_HTTP_HOST_COMPAT=1
Environment=PATH=/usr/libexec/docker:/usr/bin:/usr/sbin
ExecStart=/usr/bin/dockerd-current -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock \
--add-runtime docker-runc=/usr/libexec/docker/docker-runc-current \
--default-runtime=docker-runc \
--exec-opt native.cgroupdriver=systemd \
--userland-proxy-path=/usr/libexec/docker/docker-proxy-current \
$OPTIONS \
$DOCKER_STORAGE_OPTIONS \
$DOCKER_NETWORK_OPTIONS \
$ADD_REGISTRY \
$BLOCK_REGISTRY \
$INSECURE_REGISTRY
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=1048576
LimitNPROC=1048576
LimitCORE=infinity
TimeoutStartSec=0
Restart=on-abnormal
MountFlags=slave

[Install]
WantedBy=multi-user.target
[root@localhost frinder]# systemctl daemon-reload
[root@localhost frinder]# systemctl restart docker.service

客户端（idea）连接：

docker服务端设置好端口后，客户端配置 API URL为：服务器host+port，如，服务端ip：192.168.98.128，端口：2376，则配置为：http://192.168.98.128:2376

项目配置：

pom.xml中添加支持：
<docker.image.prefix>spring.io</docker.image.prefix>
<plugin>
<groupId>com.spotify</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>0.4.11</version>
<configuration>
<dockerHost>http://192.168.98.128:2376</dockerHost>
<imageName>${docker.image.prefix}/${project.artifactId}</imageName>
<dockerDirectory>src/main/docker</dockerDirectory>
<resources>
<resource>
<targetPath>/</targetPath>
<directory>${project.build.directory}</directory>
<include>${project.build.finalName}.jar</include>
</resource>
</resources>
</configuration>
</plugin>

在项目 main目录下添加目录 docker，添加文件 Dockerfile，内容如下：
FROM frolvlad/alpine-oraclejdk8:slim
VOLUME /tmp
ADD docker.app-1.0-SNAPSHOT.jar app.jar
RUN sh -c 'touch /app.jar'
ENV JAVA_OPTS=""
ENTRYPOINT [ "sh", "-c", "java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /app.jar" ]

设置 Artifacts：

注意点：
Output directory 设置，设置为 docker，即 Dockerfile同目录
jar包名称一定要与 Dockerfile中的一致，不然会报找不到文件的错误

推送到 docker：
clean package docker:build -DpushImage

push过程中会报错，忽略之，docker中是可以启动成功的！错误信息如下：

......
[WARNING] Failed to push spring.io/docker.app, retrying in 10 seconds (5/5).
[INFO] Pushing spring.io/docker.app
The push refers to a repository [spring.io/docker.app]
b5e9a3e6075a: Preparing
08ba4e16adba: Preparing
162f935b1198: Preparing
dcf909146faa: Preparing
23b9c7b43573: Preparing
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:46 min
[INFO] Finished at: 2017-04-11T16:37:15+08:00
[INFO] Final Memory: 31M/75M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.spotify:docker-maven-plugin:0.4.11:build (default-cli) on project docker.app: Exception caught: Error: Status 405 trying to push repository docker.app: "" -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

Process finished with exit code 1

检查镜像，发现 spring.io/docker.app 已经创建，启动 spring.boot项目 docker run -p 8080:8080 -t spring.io/docker.app 可以正常启动！

[root@localhost frinder]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
spring.io/docker.app latest 93ab985f7835 18 minutes ago 195.3 MB
docker.io/centos latest a8493f5f50ff 4 days ago 192.5 MB
docker.io/frolvlad/alpine-oraclejdk8 slim 00d8610f052e 5 weeks ago 166.6 MB
[root@localhost frinder]# docker run -p 8080:8080 -t spring.io/docker.app

. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.2.RELEASE)

2017-04-11 08:43:59.100 INFO 6 --- [ main] com.s.b.d.App : Starting App v1.0-SNAPSHOT on 07a7a077770d with PID 6 (/app.jar started by root in /)
2017-04-11 08:43:59.109 INFO 6 --- [ main] com.s.b.d.App : No active profile set, falling back to default profiles: default
2017-04-11 08:43:59.283 INFO 6 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4b9af9a9: startup date [Tue Apr 11 08:43:59 GMT 2017]; root of context hierarchy
2017-04-11 08:44:01.873 INFO 6 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-04-11 08:44:01.905 INFO 6 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2017-04-11 08:44:01.908 INFO 6 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.11
2017-04-11 08:44:02.097 INFO 6 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-04-11 08:44:02.098 INFO 6 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2826 ms
2017-04-11 08:44:02.322 INFO 6 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-04-11 08:44:02.334 INFO 6 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-04-11 08:44:02.336 INFO 6 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-04-11 08:44:02.336 INFO 6 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-04-11 08:44:02.336 INFO 6 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-04-11 08:44:02.822 INFO 6 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4b9af9a9: startup date [Tue Apr 11 08:43:59 GMT 2017]; root of context hierarchy
2017-04-11 08:44:03.006 INFO 6 --- [ 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)
2017-04-11 08:44:03.008 INFO 6 --- [ 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)
2017-04-11 08:44:03.066 INFO 6 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-04-11 08:44:03.066 INFO 6 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-04-11 08:44:03.150 INFO 6 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-04-11 08:44:03.191 INFO 6 --- [ main] oConfiguration$WelcomePageHandlerMapping : Adding welcome page: class path resource [templates/index.html]
2017-04-11 08:44:03.411 INFO 6 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2017-04-11 08:44:03.506 INFO 6 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-04-11 08:44:03.518 INFO 6 --- [ main] com.s.b.d.App : Started App in 5.108 seconds (JVM running for 5.93)

已经可以访问了！