[Lxc-users] Server capacity planing and real world usage.

[Leon Waldman]

Hi all, first post on the list :)


I have two main questions, that will maybe get some ramifications.

The first one is...

Assuming a hardened Guest image (SELinux or Apparmor + The NSA 
Guidelines + no shell access on the guests), A LXC Host would be 
suitable to use as containment and resources control system for web 
hosting of several clients (I mean... Several 1000+)?


The second question is...

Assuming a Duo-Quad core intel machine, with 32 Gigs of RAM, how many 
containers I could squeeze on it? (Like... without any service running, 
what would be the memory and cpu overhead?)


For apache hosting I made some rough research and came to something like 
this:

For idle containers:
Ma . Ac / (Mt / 3) . 2

Where:
Ma => Apache proc memory consumption
Ac => Number of apache processes per container
Mt => Total amount of memory on the host

I also leaved one third of the total memory not allocated to allow some 
space for apaches to grow.


For loaded containers:
Cgroups memory limit / Total amount of memory

Do all this looks sane? :P


Thanks in advance for any information on the subject.


--
Leon Waldman
SysAdmin Linux Sênior - Arquiteto de Infra-Estrutura & TI.