1、问题

在CentOS下使用yum安装软件，结果出现了下面的错误提示：

# yum install

There was a problem importing one of the Python modules

required to run yum. The error leading to this problem was:

/usr/lib/python2.6/site-packages/pycurl.so: undefined symbol: CRYPTO_set_locking_callback

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, Jan 22 2014, 09:37:14)

[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)]

If you cannot solve this problem yourself, please go to

the yum faq at:

http://yum.baseurl.org/wiki/Faq

2、查看当前的环境变量

# env | grep LD

OLDPWD=/root

LD_LIBRARY_PATH=:/usr/local/lib

运行时链接库的目录被我设置成了这个/usr/local/lib。

取消这个运行时链接库试试：

# export -n LD_LIBRARY_PATH

# yum install busybox

已加载插件：fastestmirror

设置安装进程

Loading mirror speeds from cached hostfile

* base: mirrors.btte.net

* extras: mirrors.opencas.cn

* updates: mirror.bit.edu.cn

base | 3.7 kB 00:00

extras | 3.4 kB 00:00

updates | 3.4 kB 00:00

解决依赖关系

--> 执行事务检查

---> Package busybox.i686 1:1.15.1-21.el6_6 will be 安装

--> 完成依赖关系计算

.

.

.

果然是这个链接库的问题。

3、分析：

应该是yum依赖python的模块的模块。但是在进行加载的时候，找错目录了，结果就加载错了模块的链接库。