1. setup local yum source using OL7.4 iso file

2. yum install python2-cryptography.x86_64

3. rpm -Uvh python-paramiko-2.1.1-2.el7.noarch.rpm

（download url: http://mirror.centos.org/centos/7/extras/x86_64/Packages/python-paramiko-2.1.1-4.el7.noarch.rpm)

4. yum install PyYAML

5. yum install python-jinja2-2.7.2-2.el7.noarch.rpm

6. python setup.py install

7. mkdir -p /etc/ansible
     cp ./examples/ansible.cfg /etc/ansible
     cp ./examples/hosts     /etc/ansible