Jika anda mendapati error di centos 6 /usr/lib64/python2.6/site-packages/pycurl.so: undefined symbol: CRYPTO_set_locking_callback

solusinya

mv /usr/lib64/python2.6/site-packages/pycurl.so /usr/lib64/python2.6/site-packages/pycurl.so_back
rpm -ihv http://mirror.centos.org/centos/6/os/x86_64/Packages/python-devel-2.6.6-66.el6_8.x86_64.rpm
wget https://dl.bintray.com/pycurl/pycurl/pycurl-7.43.0.2.tar.gz
tar xzf pycurl-7.43.0.2.tar.gz 
cd pycurl-7.43.0.2
python setup.py build --curl-config=/usr/local/bin/curl-config
cp -p build/lib.linux-x86_64-2.6/pycurl.so /usr/lib64/python2.6/site-packages/pycurl.so

Sumber : https://forum.directadmin.com/threads/yum-stops-to-work.55333/