[Openstack] Legacy Application Run on top of OpenStack

Amrith Kumar amrith at tesora.com
Thu May 29 18:39:19 UTC 2014

Hi Hossein,

You can get HA on OpenStack for things like storage just as you would in
your existing data center. Unless you are running some highly available or
fault tolerant hardware in your data center, I believe you will see
comparable reliability in an OpenStack cloud, at least with respect to

I am interpreting Jay's answer below to say that you can build additional
availability through scale-out paradigms but that may be inconsistent with
your desire to make no change to your applications.

If what you are looking for is a fault tolerant offering in the OpenStack
cloud, maybe you want to look at something like Stratus (I'm sure someone
from Stratus can respond and tell you more).


| -----Original Message-----
| From: Jay Pipes [mailto:jaypipes at gmail.com]
| Sent: Thursday, May 29, 2014 1:56 PM
| To: openstack at lists.openstack.org
| Subject: Re: [Openstack] Legacy Application Run on top of OpenStack
| On 05/29/2014 05:12 AM, hossein zabolzadeh wrote:
| > Hi there.
| > I am baffling between Cloudstack and Openstack to select. My
| > Datacenter has more than 10 legacy application, which need to be run
| > on top of the best matched CMP(Cloud Management Platform). I am search
| > a lot and I select openStack and CloudStack at the end. But, I can not
| > make a final decision about these two CMPs. I don't want to make any
| > change to my legacy application codebase. So, my exact concern is:
| > "How legacy applications can be run on OpenStack without any HA and
| > resiliancy problems?" As we know cloud-ready applications are fully
| > awared from underlying infrastucture, but what about non-cloud-ready
| > apps(Legacy Applications)?
| > CloudStack is DC virtualization cloud solution(Vcloud Like Cloud
| > Solution) that handle all of the HA and resiliancy in the
| > infrastructure layer, but the paradigm in openStack is infrastructure
| > provisioning(AWS like cloud), which the HA problems shoud be addressed
| in application layer.
| > So at general, how openStack support legacy applications to run
| > without any HA problems?
| > Thanks in advance.
| Hi Hossein,
| The short answer is that the idea behind "legacy" applications -- i.e.
| that applications should rely on infrastructure to handle reliability of
| the application in a scale-up-only manner -- is not something that the
| OpenStack platform really encourages.
| We encourage scale-out behaviour and application development methodologies
| that give the scaling, reliability, and resiliency control to the
| application deployer to implement as they see fits best their application.
| It's not a one-size-fits-all world, and as such, there are plenty of
| application architectures and deployment methodologies that are supported
| in cloudy environments; OpenStack doesn't pick or choose one over another.
| Best,
| -jay
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