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Software engineers are taught SOLID principles. The L stands for Loose coupling. Loosely coupled software components are seen as a must if you are going to create software that is not brittle, easy to maintain, and testable. The same principle is used at an infrastructure level. |
Consider the following application hosted in the cloud
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The machine instance has a public IP address of 52.211.55.38. But this could change. If stopped the machine instance and then start the machine image again it will get a new IP address. This would be a nightmare for any application wanting to connect to this instance on long-term basis. We could replace the machine instance IP with an elastic IP, but these are limited and chargeable resources.
A better approach would be to use some kind of naming server (like a DNS)
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The DNS decouples the user (browser/mobile phone) from having to know the IP addess of machine instance.