定义了云的基础架构后，就可以开始探究如何应用开源技术来构建一个动态的云基础设施了。
With the basic architecture of a cloud defined, let's now explore where open source is being applied to build out a dynamic cloud infrastructure.
实现动态扩展基础架构的一个关键原因是新实例可以在不需要人工干预的前提下部署到生产环境。
A key element of growing your infrastructure dynamically is that a new instance is going to have to attach itself to the production environment without outside intervention.
与此同时，对这些虚拟实例加以监控(和阻止)为组织提供了所需的使用分析能力从而使其能够动态评估和利用基础架构成本。
At the same time monitoring (and stopping) these virtual instances provided the usage analysis capabilities required for the organization to dynamically assess and leverage infrastructure costs.
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