[Azure]Azure虚拟机代理服务（waagent）代码简单分析

我们在Azure中创建一台CentOS7.4的虚拟机，首先我们看一下/sbin/waagent这个执行文件：

import os import imp import sys   if __name__ == '__main__' :     import azurelinuxagent.agent as agent     """     Invoke main method of agent     """     agent.main()   if __name__ == 'waagent':     """     Load waagent2.0 to support old version of extensions     """     if sys.version_info[0] == 3:         raise ImportError("waagent2.0 doesn't support python3")     bin_path = os.path.dirname(os.path.abspath(__file__))     agent20_path = os.path.join(bin_path, "waagent2.0")     if not os.path.isfile(agent20_path):         raise ImportError("Can't load waagent")     agent20 = imp.load_source('waagent', agent20_path)     __all__ = dir(agent20)

 

可以看到，是执行了azurelinuxagent.agent这个模块中的main方法。

我们在python中查看一下环境变量：

[root@dancentos74-2daniel]# python

Python2.7.5 (default, Aug  4 2017, 00:39:18)

[GCC4.8.5 20150623 (Red Hat 4.8.5-16)] on linux2

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>>>import