The fewer hardware tiers involved, the less vulnerable the entire system is to a single machine outage.
较少的硬件相关性，以及整个系统单一的硬件损耗，使得系统很少会有受到攻击的可能性。
Although we strongly recommend separating tiers on different machines, you can run the sample using a single machine, and replace each address given above with localhost.
尽管，我们强烈建议在不同的机器上分离层，但是您可以使用一台机器运行样例，然后使用localhost替换上述每个给定地址。
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