Guidline to manage dev/tst/uat/prd web instances

In large organizations, there usually multiple web instances/environments to work with different project phases (i.e. dev/tst/uat/prd). In our current configurations, we have dev/tst/uat hosting in one physical server, and pro environment has its own dedicated server. This guidline is what I drafted to manage the web instances in my current employment for 3-4 projects.

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