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I am building infrastructure to support a web application. I think I have a decent idea of what the infrastructure should look like, here's what I have:

  • 2 x 16GB, 4-Core HAProxy servers for load balancing.

  • 2 x 16GB, 4-Core servers that run the app (Mojolicious / Hypnotoad)

  • 1 x 8GB, 2-core server for dev environment

  • 1 x 2GB, 2-core server for git repositories.

There's more to the infrastructure (monitoring, openldap / kerberos, zmq, etc). We are actually not hosting the database, but rather using Orchestrate.io for that, and zeromq locally to handle API calls.

Anyway, my question: What is this field called? I'd like to do more research into exactly how this should be set up, things I may need, etc. I've seen quite a few 'web app architecture diagrams', but not a single one has show the server's specs. I have questions like, "Are 4 8GB servers behind the load balancer better than 2 16GB servers?" A lot of questions of that nature, but I don't even know where to start to begin researching the subject.

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check: ITIL - Capacity Planning

In terms of your specific questions:

"Are 4 8GB servers behind the load balancer better than 2 16GB servers?"

it really depends on your architecture, design, other services (monitoring, config. mng. logging etc), etc.

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