linux配置docker报错：ImportError: No module named yum

　　如题，安装docker后配置仓库报错：

[root@centos ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
Traceback (most recent call last):
  File "/usr/bin/yum-config-manager", line 6, in <module>
    import yum
ImportError: No module named yum

　　

　　按提示看了yum-config-manage文件：

[root@centos ~]# vi /usr/bin/yum-config-manager

#!/usr/bin/python -tt

import os, os.path
import sys
import re
import yum
sys.path.insert(0,'/usr/share/yum-cli')
from utils import YumUtilBase
import logging
import fnmatch

from iniparse import INIConfig

　　这里的python并未指定版本，看看系统的版本

[root@centos ~]# python -V
Python 2.7.10

　　实际python指向了2.7版本。而yum的python版本呢？

[root@centos ~]# vi /usr/bin/yum

#!/usr/bin/python2.6
import sys
try:
    import yum
except ImportError:
    print >> sys.stderr, """
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

　　所以现在很清楚了，用yum执行config命令时，yum本身的python是2.6版本的，而执行的config却指向2.7，所以报错了。

　　怎么办？要么改yum的python版本，要么改config的，试试修改config

[root@centos ~]# vi /usr/bin/yum-config-manager

#!/usr/bin/python2.6 -tt

　　再次配置docker仓库，没有再报错：

[root@centos ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
Loaded plugins: fastestmirror
adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
docker-ce.repo                                                                                                                                  | 2.4 kB     00:00     
repo saved to /etc/yum.repos.d/docker-ce.repo