Re: [PLUG] small business server virtualization?

["Lee H. Marzke" <lee@marzke.net>]

----- Original Message -----
> From: "Rich Freeman" <r-plug@thefreemanclan.net>
> To: "Philadelphia Linux User's Group Discussion List" <plug@lists.phillylinux.org>
> Sent: Tuesday, November 7, 2017 10:09:01 AM
> Subject: Re: [PLUG] small business server virtualization?

> On Tue, Nov 7, 2017 at 7:04 AM, Lee H. Marzke <lee@marzke.net> wrote:
>>
>> Yes you can,   but it costs money to re-design.    So a  business looks the
>> cost of redesign,  and then the cost to manage 100 separate containers
>> instead of just 1 VM
>> and it's not clear that you win anything.
> 
> Why would you run only 1 VM in a situation where you would be running
> 100 containers?  You would run one container per application instance,
> and you would run one VM in the same situation.
> 

I'm no expert on Docker containers,  but if you take a typical VM from VMware
such as vCenter Appliance,  it runs a tomcat web server,  postgreSQL DB,  a round-robin DB
an inventory service, and message broker like rabbitMQ.

To properly use containers , if I understand it, each of these services would be split out,
and some services might be split into several sub-services perhaps at the
module level so that you get high re-use.   So a VM like vCenter would take dozen
or more containers to implement it.

> Sure, if you compare dumping all your services onto one VM to
> isolating them the complexity sort-of goes down, but then I'm not sure
> why you're even bothering to virtualize.
> 
> I will agree that if you already have 100 physical hosts it is going
> to be easier to just migrate them 1:1 to 100 VMs.  However, putting an
> application in a container isn't really any more complex than putting
> them in a VM otherwise.
> 
> --
> Rich
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-- 
"Between subtle shading and the absence of light lies the nuance of iqlusion..." - Kryptos 

Lee Marzke, lee@marzke.net http://marzke.net/lee/ 
IT Consultant, VMware, VCenter, SAN storage, infrastructure, SW CM 
+1 800-393-5217 office 
+1 484-348-2230 fax
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