将dockerdemo-0.0.1-SNAPSHOT.jar上传到centos /opt下面
    在/opt创建 vi Dockerfile 

    1. FROM java:8
    2. VOLUME /tmp
    3. RUN mkdir /app
    4. ADD dockerdemo-0.0.1-SNAPSHOT.jar app.jar
    5. RUN bash -c 'touch /app.jar'
    6. ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
    7. ENTRYPOINT ["java", "-jar", "/dalaoyang.jar"

    执行命令
    docker build -t spdemo2 .
    查看镜像
    docker images

    1. [root@bogon proj]# docker images
    2. REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
    3. spdemo2             latest              eb72ffc97e0c        5 seconds ago       677MB
    4. java                8                   d23bdf5b1b1b        2 years ago         643MB

    启动
    docker run -di —name=spdemo2 -p 8080:8080 spdemo2:latest
    浏览器访问localhost:8080