[Openstack-operators] [nova] VM HA support in trunk

Bajin, Joseph jbajin at verisign.com
Tue Feb 16 14:17:24 UTC 2016

I would have to agree with Matt.  The ability for any sort of handling of failures either reside within the application or tools around the application to make it work.  Having the infrastructure handle the failures, I believe, is a slippery slope that is starting to appear more and more. 

I do fear that many people/organizations are starting to look at the cloud as a “low cost” or “free” VMWare solution.  They want the same enterprise based availability and support that they get with a vendor paid solution without the cost of the vendor paid solution.   I have started to see and hear more about how vendors are adding “enterprise” solutions to OpenStack.  This includes High Availability features that rely on the infrastructure to manage instead of the application.  I fear the direction of all the projects will begin migrating this way as more vendors get involve and want to figure out business models that they can use around “enterprise” feature-sets. 


From:  Matt Fischer <matt at mattfischer.com>
Date:  Monday, February 15, 2016 at 10:59 AM
To:  Toshikazu Ichikawa <ichikawa.toshikazu at lab.ntt.co.jp>
Cc:  "openstack-operators at lists.openstack.org" <openstack-operators at lists.openstack.org>
Subject:  Re: [Openstack-operators] [nova] VM HA support in trunk

I believe that either have your customers design their apps to handle failures or have tools that are reactive to failures.

Unfortunately like many other private cloud operators we deal a lot with legacy applications that aren't scaled horizontally or fault tolerant and so we've built tooling to handle customer notifications (reactive). When we lose a compute host we generate a notice to customers and then work on evacuating their instances. For the evac portion nova host-evacuate or host-evacuate-live work fairly well, although we rarely get a functioning floating-IP after host-evacuate without other work.

Getting adoption of heat or other automation tooling to educate customers is a long process, especially when they're used to VMware where I think they get the VM HA stuff for "free".

On Mon, Feb 15, 2016 at 8:25 AM, Toshikazu Ichikawa <ichikawa.toshikazu at lab.ntt.co.jp> wrote:
Hi Affan,



I don’t think any components in Liberty provide HA VM support directly.


However, many works are published and open-sourced, here.


You may find ideas and solutions.


And, the discussion on this topic is on-going at HA meeting.






From: Affan Syed [mailto:affan.syed.usc at gmail.com] 
Sent: Monday, February 15, 2016 12:51 PM
To: openstack-operators at lists.openstack.org
Subject: [Openstack-operators] [nova] VM HA support in trunk


reposting with the correct tag, hopefully. Would really appreciate some pointers. 

---------- Forwarded message ---------
From: Affan Syed <affan.syed.usc at gmail.com>
Date: Sat, 13 Feb 2016 at 15:13
Subject: [nova] VM HA support in trunk
To: <openstack-operators at lists.openstack.org>


Hi all,

I have been trying to understand if we currently have some VM HA support as part of Liberty?


To be precise, how are host being down due to power failure handled, specifically in terms of migrating the VMs but possibly even their networking configs (tunnels etc). 


The VM migration like XEN-HA or KVM cluster seem to require 1+1 HA, I have read a few places about celiometer+heat templates to launch VMs for an N+1 backup scenario, but these all seem like one-off setups. 



This issue seems to be very much important for legacy enterprises to move their "pets" --- not sure if we can simply wish away that mindset!





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