How to accessing inventory host variable in ansible playbook?
https://stackoverflow.com/questions/40027847/accessing-inventory-host-variable-in-ansible-playbook
ansible变量
https://www.centos.bz/2017/09/ansible%E5%8F%98%E9%87%8F
Ansible 进阶技巧
https://www.ibm.com/developerworks/cn/linux/1608_lih_ansible/index.html
http://www.ansible.com.cn/docs/intro_inventory.html
动态 Inventory
http://www.ansible.com.cn/docs/intro_dynamic_inventory.html
Ansible 快速入门
https://www.cnblogs.com/dachenzi/p/8916521.html
Ansible 跨主机变量引用
https://www.jianshu.com/p/9c43383e9563
Using Variables
https://docs.ansible.com/ansible/latest/user_guide/playbooks_variables.html#magic-variables-and-how-to-access-information-about-other-hosts
Ansible主机清单Inventory文件hosts
http://wangshengzhuang.com/2017/05/14/%E8%BF%90%E7%BB%B4%E7%9B%B8%E5%85%B3/Ansible/Ansible%E4%B8%BB%E6%9C%BA%E6%B8%85%E5%8D%95Inventory%E6%96%87%E4%BB%B6hosts
