5.1 Virtualization and containers
All cloud servers are virtual servers. A virtual server runs on an underlying physical computer and is made up of an operating system plus a set of software packages that provide the server functionality required. The general idea is that a virtual server is a stand-alone system that can run on any hardware in the cloud.
This “run anywhere” characteristic is possible because the virtual server has no external dependencies. An external dependency means you need some software, such as a database management system, that you are not developing yourself. For example, if you are developing in Python, you need a Python compiler, a Python interpreter, various Python libraries, and so on.
When you run software on different ...
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