install eventlet ,redis,dreque on centos

change default python to python26,use mv command
easy_install redis
easy_install dreque
change the python back to original python interperter
yum -y install gcc
yum install kernel-headers
chnage to the new python interperter
easy_install eventlet

http://hi.baidu.com/trunkey/blog/item/8c4599a2386af1a6caefd0f8.html