在虚拟机上搭建hadoop，并启动（这里采用伪分步式。）
root@ubuntu:~# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
ouruser/sinatra v2 7e9b2767cf4f 3 hours ago 320.9 MB
jingyu1hao/docker-whale latest 3179f50aaae0 3 weeks ago 274.6 MB
ubuntu 14.04 8f1bd21bd25c 3 weeks ago 188 MB
hello-world latest 94df4f0ce8a4 7 weeks ago 967 B
docker/whalesay latest 6b362a9f73eb 13 months ago 247 MB
docker安装： ``` root@ubuntu:~/study/docker/mydockerbuild# curl -fsSL https://get.docker.com/ | sh
jps :
问题：