There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
/usr/lib64/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, Aug 18 2016, 15:13:37)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)]
If you cannot solve this problem yourself, please go to
the yum faq at:
http://yum.baseurl.org/wiki/Faq
解决办法共三步：
rm -rf /usr/local/lib/libcurl*
rm -rf /usr/local/lib/libcurl.so.4
ln -s /usr/lib64/libcurl.so.4.1.1 /usr/local/lib/libcurl.so.4
