CentOS 6.* 運行yum報錯：No module named rpm

1. 使用yum安裝軟件時，報如下錯誤:

[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是否爲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：

修改yum指向到python2.6.6

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

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

4. 如果yum指向的是2.6.6：

則說明centos6.*的python2.6.6損壞，通過rpm重裝python2.6.6，須到官網下載指定版本的包：
官網：http://vault.centos.org/6.8/os/x86_64/Packages/

需下載的包：

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

安裝下載的rpm包：

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

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

5. 如果yum不可用，重裝yum包。

# 需下載的包：
yum 
yum-metadata-parser 
yum-utils 
yum-plugin-fastestmirror 
yum-plugin-protectbase 
yum-plugin-aliases 
yum-plugin-downloadonly

# 安裝
rpm -ivh yum*

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