add

@@ -3,6 +3,7 @@
 host_key_checking = False
 private_key_file = /etc/ansible/key/yoho_server
 
-hostfile = ./inventories/test/hosts:./inventories/az1/hosts:./inventories/az2/hosts:./inventories/az3/hosts
+# default host file is test
+hostfile = ./inventories/test/hosts
 roles_path = ./roles
 

@@ -3,10 +3,19 @@
 
 ## How to Run
 
+>Default inventory file in [ansible.cfg] is : [./inventories/test/hosts]
+>You should identify inventory file by [-i]
+>
+
 ```
 
- ansible-playbook site.yml
- ansible-playbook site.yml --limit nginx
- ansible-playbook playbooks/nginx.yml  -i inventories/az3/hosts
+ansible-playbook site.yml -i inventories/az3/hosts
+ansible-playbook site.yml --limit nginx  -i inventories/az3/hosts
+
+# run playbooks
+ansible-playbook playbooks/nginx.yml  -i inventories/az3/hosts
+
+# run shell
+ansible all -m shell -a "cat /etc/resolv.conf"  -i inventories/az3/hosts
 
 ```
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