Ansible introduction [unfinished (semi-finished products)]

1、 choice Ansible Why

1）Ansible be based on python Development , and python Gradually popularized , Convenience is right Ansible Secondary development ;
2）Ansible With rich built-in modules （ There are even functional modules specially developed for business platforms ）, Meet the needs of daily functions ;
3）Ansible The concept of decentralization , The transfer of the management configuration center can be completed through a simple copy operation ;
4）Ansible No client , After the configuration of the management end is completed, it can be used .

2、Ansible Operation mode

Ansible There is no client , The bottom communication depends on the system software ,Linux The system is based on OpenSSH signal communication ,Windows The system is based on PowerShell signal communication ; The management side must be Linux System , After the user passes the authentication , adopt Ansible The management tool calls various modules and pushes them to the management end for execution , Automatically delete the generated temporary files after execution .

Ansible There are three roles in the working process ：
1） Users

1.  adopt CMDB（ Configuration management database ） Directly issue a command to call Ansible The tool set completes the corresponding required operations ;
2.  Ansible be based on PUBLIC（ Public cloud ）/ PRIVATE（ Private cloud ） With API Run as called ;
3.   The user uses it directly Ad-Hoc Temporary command set call Ansible Tool sets perform tasks ;
4.   The user has pre written Ansible PLAYBOOK（ Script ）, By executing the pre-defined choreographed task set sequence in the script , Perform tasks 

2）Ansible Toolset

1. INVENTORY（ detailed list ）【 Target object configuration file for command execution 】
2.  API（ Application programming interface called by third-party program ）
3.  MODULES（ Built-in module ）
4.  PLUGINS（ built-in  /  Plug ins can be defined ）

3） Object of action

Linux &  Not Linux host 、 All kinds of public  /  Private cloud 、 business  /  Network facilities for non-commercial equipment 

3、Ansible signal communication

Ansible The communication mode is based on safety and reliability SSH A secure connection , Also because SSH It's every one Linux The host system is installed by default , therefore Ansible There is no need to install additional processes , Realize no client , And then help complete the idea of decentralization .

1）Ansible SSH Working mechanism