1.centos 7.4 系统的机器，创建新集群 通过ceph-deploy命令，其本质上是创建配置文件和key文件。
ceph-deploy new hadoop-slave01 报错：
[root@hadoop-slave01 myceph]# ceph-deploy new zhangsn
Traceback (most recent call last):
File "/usr/bin/ceph-deploy", line 18, in <module>
from ceph_deploy.cli import main
File "/usr/lib/python2.7/site-packages/ceph_deploy/cli.py", line 1, in <module>
import pkg_resources
ImportError: No module named pkg_resources
解决：原因是缺python-setuptools，安装它即可：
# yum install python-setuptools
# ceph-deploy --version
2.0.02.