在開發模塊之前，現問下自己幾個問題？
- 官方是否有提供的類似功能模塊？
可從下面兩個連接確定官方提供的模塊，以免重復造輪子
官方已發布的模塊 http://docs.ansible.com/ansible/modules.html
官方正在開發的模塊 https://github.com/ansible/ansible/labels/module - 你需要開發一個action 插件么？
action插件是在ansible主機上運行，而不是在目標主機上運行的。對于類似file/copy/template功能的模塊，在模塊執行前需要在ansible主機上做一些操作的。有關action插件的開發請移步到
明確幾點
- 模塊是傳送到目標主機上運行的。
- 模塊的返回值必須是json dumps的字符串。
執行模塊的過程
首先，將模塊文件讀入內存，然后添加傳遞給模塊的參數，最后將模塊中所需要的類添加到內存，由zipfile壓縮后，再由base64進行編碼，寫入到模版文件內。
通過默認的連接方式，一般是ssh。ansible通過ssh連接到遠程主機，創建臨時目錄，并關閉連接。然后將打開另外一個ssh連接，將模版文件以sftp方式傳送到剛剛創建的臨時目錄中，寫完后關閉連接。然后打開一個ssh連接將任務對象賦予可執行權限，執行成功后關閉連接。
最后，ansible將打開第三個連接來執行模塊，并刪除臨時目錄及其所有內容。模塊的結果是從標準輸出stdout中獲取json格式的字符串。ansible將解析和處理此字符串。如果有任務是異步控制執行的，ansible將在模塊完成之前關閉第三個連接，并且返回主機后，在規定的時間內檢查任務狀態，直到模塊完成或規定的時間超時。
使用了管道連接后，與遠程主機只有一個連接，命令通過數據流的方式發送執行。
配置方式
vim /etc/ansible/ansible.cfg
pipelining = True
執行過程
模塊工具
Ansible提供了許多模塊實用程序，它們提供了在開發自己的模塊時可以使用的輔助功能。 basic.py模塊為程序提供訪問Ansible庫的主要入口點，所有Ansible模塊必須至少從basic.py導入：
from ansible.module_utils.basic import *
其他模塊工具
a10.py - Utilities used by the a10_server module to manage A10 Networks devices.
api.py - Adds shared support for generic API modules.
aos.py - Module support utilities for managing Apstra AOS Server.
asa.py - Module support utilities for managing Cisco ASA network devices.
azure_rm_common.py - Definitions and utilities for Microsoft Azure Resource Manager template deployments.
basic.py - General definitions and helper utilities for Ansible modules.
cloudstack.py - Utilities for CloudStack modules.
database.py - Miscellaneous helper functions for PostGRES and MySQL
docker_common.py - Definitions and helper utilities for modules working with Docker.
ec2.py - Definitions and utilities for modules working with Amazon EC2
eos.py - Helper functions for modules working with EOS networking devices.
f5.py - Helper functions for modules working with F5 networking devices.
facts.py - Helper functions for modules that return facts.
gce.py - Definitions and helper functions for modules that work with Google Compute Engine resources.
ios.py - Definitions and helper functions for modules that manage Cisco IOS networking devices
iosxr.py - Definitions and helper functions for modules that manage Cisco IOS-XR networking devices
ismount.py - Contains single helper function that fixes os.path.ismount
junos.py - Definitions and helper functions for modules that manage Junos networking devices
known_hosts.py - utilities for working with known_hosts file
mysql.py - Allows modules to connect to a MySQL instance
netapp.py - Functions and utilities for modules that work with the NetApp storage platforms.
netcfg.py - Configuration utility functions for use by networking modules
netcmd.py - Defines commands and comparison operators for use in networking modules
network.py - Functions for running commands on networking devices
nxos.py - Contains definitions and helper functions specific to Cisco NXOS networking devices
openstack.py - Utilities for modules that work with Openstack instances.
openswitch.py - Definitions and helper functions for modules that manage OpenSwitch devices
powershell.ps1 - Utilities for working with Microsoft Windows clients
pycompat24.py - Exception workaround for Python 2.4.
rax.py - Definitions and helper functions for modules that work with Rackspace resources.
redhat.py - Functions for modules that manage Red Hat Network registration and subscriptions
service.py - Contains utilities to enable modules to work with Linux services (placeholder, not in use).
shell.py - Functions to allow modules to create shells and work with shell commands
six/init.py - Bundled copy of the Six Python library to aid in writing code compatible with both Python 2 and Python 3.
splitter.py - String splitting and manipulation utilities for working with Jinja2 templates
urls.py - Utilities for working with http and https requests
vca.py - Contains utilities for modules that work with VMware vCloud Air
vmware.py - Contains utilities for modules that work with VMware vSphere VMs
vyos.py - Definitions and functions for working with VyOS networking
