Optimizing Cloud Migration: Performance Lessons for the Enterprise

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Page 24 of 35

Phase 3: Enhancing Your Cloud Solution Having started your migration to the cloud, there are a set of consid‐ erations that will enable you to start taking your cloud-based sys‐ tems to the next level. Design for Failure at the Network as well as Application Layers It is a mantra that is as old as the cloud itself: the cloud doesn't guar‐ antee success, but it does give you the tools to deal with failure. The ability to dynamically create infrastructure on demand removes the dependency on hardware that is characteristic of data centers. Everything you do in the cloud should assume failure will happen. This is now a common practice for server infrastructure. The most famous example is Netflix's Chaos Monkey: a tool that goes around intentionally disabling elements of the infrastructure to ensure that their resiliency systems can cope. This is rarely done at the network level, but the same rules can apply. If your system suffers Internet performance problems, such as rout‐ ing issues that add overhead onto every request, then your system should be aware of this and be able to easily switch to another loca‐ tion. For example, if you normally serve content from Virginia because the majority of your requests come from users in Chicago, then in the event of Internet performance issues, it should be easy to switch to serving content from another relevant location, such as San Francisco. This allows you to respond not only to Internet per‐ 19

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