RedHat系统，yum命令使用报错解决方案

问题

在RedHat Enterprise Server系统中，输入yum报错：

# yum
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   No module named yum

Please install a package which provides this module, or
verify that the module is installed correctly.

It's possible that the above module doesn't match the
current version of Python, which is:
2.7.13 (default, Mar 22 2018, 17:09:16) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-16)]

If you cannot solve this problem yourself, please go to 
the yum faq at:
  http://yum.baseurl.org/wiki/Faq

错误原因

错误信息描述为 yum 所依赖的python 不相符，请安装相对应的python即可

定位解决

查看yum版本

[root@bbcs1 tools]# rpm -qa |grep yum 
PackageKit-yum-plugin-0.5.8-25.el6.x86_64
yum-3.2.29-69.el6.noarch
yum-rhn-plugin-0.9.1-58.el6.noarch
PackageKit-yum-0.5.8-25.el6.x86_64
yum-utils-1.1.30-30.el6.noarch
yum-metadata-parser-1.1.2-16.el6.x86_64
yum-plugin-security-1.1.30-30.el6.noarch

查看python版本

[root@bbcs1 tools]# whereis python
python: /usr/bin/python2.6 /usr/bin/python2.7 /usr/bin/python /usr/bin/python2.6-config /usr/lib/python2.6 /usr/lib64/python2.6 /usr/include/python2.6 /usr/local/python2.7 /usr/share/man/man1/python.1.gz

执行python，查看到使用2.7的版本

猜测yum调用了高版本的python。

解决方法

查找yum文件,并编辑此py文件

[root@bbcs1 tools]# which yum
/usr/bin/yum


root@bbcs1 tools]# vi /usr/bin/yum

将

#!/usr/bin/python

改为:

#!/usr/bin/python2.6

然后保存.

再次运行yum OK