I would like to get a checking and optimization of a linux server. I am currently hosting about 8 websites in a virtual private server and I think it is not working properly despite the resources it have.
Since I am not system admin, I need help to chek red alerts I have on server (numfile, diskspaceknow, etc.), to know if I need more server resources according to the website trafiics, etc. also I am using phplists open source for mailing lists which I think does not work propoerly (it seems to take a lot of server resources, so it need to be better configured).
Data: linux virtual private server (VPS), paralell virtuozzo container, parallel plesk control panel, CentOS, 20 GB diskspace, 384MB RAM (768MB RAM dynamic)
I think it coud be a particular task to be done in some hours.