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1. Ansible Inventory
   Before we dive into Ansible and practice, there is one more thing we need to do is take care with the ansible inventory, to declare our shell-node1 to be our managed machine, how ?
   There is a configure file, to declare our node1 to be ansible managed machine, the file on master node is named /etc/ansible/hosts
   
   Edit the file, include shell-node1 to the inventory as below:
   Run command vi /ect/ansible/hosts, then update below section. From the file it's provided examples, now we go with inventory group policy.
   Uncomment the section [webservers], then put with our shell-node1 host name (you can also using IP address) under that group.
   

    Save the file and exit. Now we can go play with ansible !

2. Ansible modules
   Run below commands you will find all the modules which Ansible supported:
   

   ansible-doc -l | sort

   

    There are too much modules, from here we are going to pick a few common used to demonstrate only.

3. Ansible module help
   By running command ansible-doc -s [module name] you can find the module help documentation, for example, we can determine how to use module [command] as below:
   
4. Good, now we have Ansible all ready, and we know how to find help documentation for Ansible modules, next let's get our hand dirty, put practice on some common used modules.