# common/

主要包括 config.py，其中定义了 agent 的一些配置的关键字和默认值，和一些注册配置的函数。

## 一些配置常量

包括：

```
ROOT_HELPER_OPTS = [
    cfg.StrOpt('root_helper', default='sudo',
               help=_('Root helper application.')),
]

AGENT_STATE_OPTS = [
    cfg.FloatOpt('report_interval', default=30,
                 help=_('Seconds between nodes reporting state to server; '
                        'should be less than agent_down_time, best if it '
                        'is half or less than agent_down_time.')),
]

INTERFACE_DRIVER_OPTS = [
    cfg.StrOpt('interface_driver',
               help=_("The driver used to manage the virtual interface.")),
]

USE_NAMESPACES_OPTS = [
    cfg.BoolOpt('use_namespaces', default=True,
                help=_("Allow overlapping IP.")),
]
```

## 注册函数

往全局的 conf 中注册各个常量


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