在任何给定的时间内，只要任一主机上只有一个系统在运行，就会仅使用一个部署管理器。
As long as only one system on either host is running at any given time, only one deployment manager will be used.
用户可以上载代码，并做出仅影响其虚拟主机的轻微配置更改。
Users can upload code and make small configuration changes that affect only their virtual host.
这还可能意味着管理员仅重新生成了主机密钥。
It can also mean that the administrator has simply regenerated the host keys.
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