如果管理端口还不可用，确保向虚拟主机admin_host定义中添加管理端口。
Be sure to add the admin port to the virtual host admin_host definition, if it is not already available.
它为 SSH 设置了 ConnectTimout 选项，使得在运行一个命令时，您需要等待连接到一台不可用的主机。
This sets the ConnectTimout option to SSH to ensure that when running a command you don't needlessly wait to connect to a host that might not be available.
当一个远程主机关闭时，一个nfs加载的目录将变得不可用。
An NFS-mounted directory became unavailable when a remote host was turned off.
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