實戰：windows下使用docker部署springboot web demo項目

一: 新建一個SpringBoot-web 項目

• 略

• 在pom.xml 引入Docker maven plugin

• <build>
      <plugins>
          ...
          <!-- Docker maven plugin -->
          <plugin>
              <groupId>com.spotify</groupId>
              <artifactId>dockerfile-maven-plugin</artifactId>
              <version>1.4.10</version>
              <configuration>
                  <tag>${project.build.finalName}-demo</tag>
                  <buildArgs>
                      <JAR_FILE>${project.build.finalName}.jar</JAR_FILE>
                  </buildArgs>
              </configuration>
          </plugin>
          <!-- Docker maven plugin -->
      </plugins>
  </build>
  

二: 安裝Docker java 8 鏡像

docker  pull  java:8

三: 添加Dockerfile

在pom.xml 平級目錄新建Dockerfile文件

FROM java:latest
VOLUME /tmp
ARG JAR_FILE
ADD target/${JAR_FILE} /app.jar
#暴露端口
EXPOSE 8088
ENV JVM_OPTS="-Xmx1344M -Xms1344M -Xmn448M -Xloggc:/data/log/demo-jvm.log -XX:+UseConcMarkSweepGC -Dfile.encoding=utf-8 -Duser.timezone=Asia/Shanghai -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=70  -XX:+CMSClassUnloadingEnabled -XX:+ParallelRefProcEnabled -XX:+CMSScavengeBeforeRemark -XX:+PrintGCDetails -XX:+HeapDumpOnOutOfMemoryError -XX:+PrintClassHistogramAfterFullGC -XX:+PrintCommandLineFlags -XX:+PrintGCApplicationConcurrentTime -XX:+PrintGCApplicationStoppedTime -XX:+PrintTenuringDistribution -XX:+PrintHeapAtGC -XX:HeapDumpPath=/tmp/demo-heapdump.hprof -XX:MaxMetaspaceSize=256M -XX:MetaspaceSize=256M"

ENTRYPOINT java ${JVM_OPTS} -Djava.security.egd=file:/dev/./urandom -jar /app.jar

四:使用 DockerFile 構建鏡像
執行命令:
mvn clean package dockerfile:build

查看鏡像結果:
docker images

五: 運行docker鏡像
執行命令:
docker run -d -p 8088:8080 --name docker-demo admol/docker-demo:docker-demo

六:查看運行結果

• 瀏覽器驗證
  • 訪問 http://localhost:8088/hello
• docker 驗證
  • 運行docker ps 命令查看運行中的容器
• docker 容器日志驗證
  • docker logs containerid -f

七:進入容器
windows 環境下:
winpty docker exec -it containerid sh
查看進程ID
jps
跟蹤GC執行情況
jstat -gccause pid 3s
退出容器命令
exit

遇到的問題
問題1:打包出現錯誤:

[ERROR] No plugin found for prefix 'docker' in the current project and in the plugin groups...

解決辦法: 修改 maven 的配置文件 settings.xml

<pluginGroups>
	<pluginGroup>com.spotify</pluginGroup>
</pluginGroups>

問題2:打包出現Connection refused 錯誤:

[ERROR] Failed to execute goal com.spotify:dockerfile-maven-plugin:1.4.10:build (default-cli) on project docker-demo: Could not build image: java.util.concurrent.ExecutionException: com
.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: com.spotify.docker.client.shaded.org.apache.http.conn.HttpHostConnectException: Connect to localhost:2375 [localhost/127.0
.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect -> [Help 1]

解決辦法: 右鍵運行中的docker，Settings, 勾選 Expose daemon on tcp://localhost:2375 without TLS; 然后重啟docker

• 項目完整示例代碼