CentOS 6.* 运行yum报错：No module named rpm

1. 使用yum安装软件时，报如下错误:

[root@node1 ~]# yum install lrzsz
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

No module named rpm

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:
2.6.6 (r266:84292, Jul 23 2015, 15:22:56)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-11)]

If you cannot solve this problem yourself, please go to
the yum faq at: http://yum.baseurl.org/wiki/Faq 
[root@node1 ~]#

2. 查看yum指向的python是否为2.6.6

[root@node1 ~]# head -1 /usr/bin/yum
#!/usr/bin/python2.6
[root@node1 ~]# ll /usr/bin/python2.6
-rwxr-xr-x 1 root root 4864 7月  24 2015 /usr/bin/python2.6
[root@node1 ~]# /usr/bin/python2.6 --version
Python 2.6.6
[root@node1 ~]#

3. 如果yum不是指向python2.6.6：

[root@node1 ~]# vim /usr/bin/yum

# 测试
[root@node1 ~]# yum install lrzsz

4. 如果yum指向的是2.6.6：

python
python-iniparse
python-pycurl
python-urlgrabber
python-devel
python-libs
python-setuptools
rpm-python

[root@node1 ~]# rpm -ivh *rpm

# 测试yum是否可用
[root@node1 ~]# yum install lrzsz

5. 如果yum不可用，重装yum包。

# 需下载的包：
yum
yum-metadata-parser
yum-utils
yum-plugin-fastestmirror
yum-plugin-protectbase
yum-plugin-aliases
yum-plugin-downloadonly

# 安装
rpm -ivh yum*

# 测试
[root@node1 ~]# yum install lrzsz