I want to prepare a docker architecture for a project in my company. So I have to POC docker on the company infrastructure, I mean I have to prove that all testing VMs (around 35-40) could be dockerized in one or two replicated VMs.
I’m reading a lot of documentation (on docker website and google topics related to docker), but I never found a response for my question in all what I read.
My question is, how to estimate the usage of RAM & CPU of each container that will run under one VM. For example I want to migrate PostgreSQL databases, LAMP server, LogServers to containers but how can I determine the RAM that I can set to a container without mounting the container for test and monitoring its memory & cpu usage to have an estimation ?
In a normal VM when I set RAM, I take into consideration the Operating System, running processes, tools installed etc. More RAM can be added when a specific program need more RAM cause nagios monitor the usage, but on docker how to anticipate this by setting the correct amount of RAM ?
Please give me all detailed reply that can help me !
Big thanks for you all guys