[TriLUG] Hosting multiple WordPress sites - VMWare or OpenVZ

[Igor Partola]

At a high level, OpenVZ provides slightly higher performance, but VMWare
provides better isolation. Specifically, OpenVZ does not let you run a
separate kernel for the VM.

When renting, I much prefer VMWare or Xen to OpenVZ or KIM since the latter
are easier to "oversell", put more VMs on a machine than there is RAM. If
you are the admin this may turn to an advantage, if you know some customers
of yours will get less traffic than others. However I would take
predictable performance over dynamic resource scaling.

For your actual problem, I would definitely recommend setting up
nginx+apache+WordPress SuperCache. That setup scales up to getting heavily
slashdotted on very little RAM.

Also check out the silicon on www.lowendbox.com for some great info on
setting up WP on various types of VPSs.

Igor
On Jan 29, 2012 11:43 PM, "Warren Myers" <volcimaster at gmail.com> wrote:

> First, a VPS *is* a VM - its jut one you are renting from somebody :)
>
> I'm only familiar with VMware, and can't say enough good things about it -
> if you can afford the licensing :)
>
> -Warren
>
> On Sunday, January 29, 2012, Ron Kelley <rkelleyrtp at gmail.com> wrote:
> > Greetings all,
> >
> > I am working on a project to start hosting multiple (potentially hundreds
> of) WordPress sites in our data center rack.  After doing some research, I
> am trying to decide between hosting the sites in a CentOS VM, or use OpenVZ
> and create a VPS container for each customer.  Since we already have VMWare
> deployed in the infrastructure, installing CentOS/LAMP in a VM with
> apache's virtual hosting was my first choice.
> >
> > One of my concerns is if one of the WordPress sites get compromised,
> other customers' sites may get compromised as well.  From this perspective,
> VPS containers seem more secure, but I am less familiar with the OpenVZ
> environment.  I also understand performance issues in one VPS container is
> not supposed to affect other containers.  However, customers running inside
> the same VM will definitely get affected by a rogue site.
> >
> > Can anyone provide some insight or first-hand-knowledge comparing a VPS
> to a VM when trying to host multiple word press sites inside the same
> "container"?  I need to look at security, performance, reliability, and
> backup/restore capabilities.
> >
> > For what it's worth, the server is very powerful - 2x 6-core Intel Xeon
> CPUs (3.4GHz) with 96GB RAM.  I figured that should be plenty of horsepower
> to host many WordPress sites; I just need to find the right OS "container"
> to host them.
> >
> > Thanks for any input,
> >
> > -----------------------------
> > Ron Kelley
> > rkelleyrtp at gmail.com
> >
> > --
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> --
> Warren Myers
> http://warrenmyers.com
> http://twitter.com/volcimaster
> http://www.linkedin.com/in/warrenmyers
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