当然，本地主机实例是一个在某处运行的AMI。
Of course, the localhost instance is an AMI running somewhere out there in the ether.
由主机接口的全限定名称来缓存各主机实例。
Each Home instance is cached by the fully qualified name of the Home interface.
现在，一个carp接口可以包含多达32个虚拟主机实例。
One carp interface can now contain up to 32 virtual host instances.
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