[one-dev] Live migration / recovery

[Gareth Bult]

Ok, this almost seems too easy ... :) 

What I was trying to avoid was more tweaking of ON files when installing VDC. 

The issue I see is that each time someone upgraded ON, they will potentially have a chain of 
small patches to apply ... if I supply a few small patches based on "if <vdc installed> - do something extra" 
would you include these in the stock scripts?? 

Gareth. 

-- 
	
Gareth Bult 
“The odds of hitting your target go up dramatically when you aim at it.” 
See the status of my current project at http://vdc-store.com 


----- Original Message -----

From: "Ruben S. Montero" <rsmontero at opennebula.org> 
To: "Gareth Bult" <gareth at linux.co.uk> 
Cc: dev at lists.opennebula.org 
Sent: Sunday, 12 January, 2014 10:36:30 PM 
Subject: Re: [one-dev] Live migration / recovery 

Hi Gareth 

As the migrate script can be easily updated we do not provide any hook for that. I'd go to kvm/migrate, and do a simple if [ $? ... after the virsh command to kill the cache on the target host. 

Cheers 

Ruben 


On Thu, Dec 19, 2013 at 12:54 PM, Gareth Bult < gareth at linux.co.uk > wrote: 



Hi, 

I implemented live migration for the VDC driver a few weeks back and on the whole it seems to work 
quite well. The "premigrate" script creates a cache instance on the target server and puts the source 
cache into proxy mode, then the "postmigrate" script kills the original cache instance. 

Problem :: if the migration fails, I'm left with a running cache on both the source and target servers, with 
the source cache in proxy mode. I have a 1-line CLI command to revert the issue, but I need to hook into 
the system in order to call it. 

How to do I do this, I guess effectively I need something like "postmigrate_fail" .. ??? 

tia 
Gareth. 

-- 
	Gareth Bult 
“The odds of hitting your target go up dramatically when you aim at it.” 




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-- 
-- 
Ruben S. Montero, PhD 
Project co-Lead and Chief Architect 
OpenNebula - Flexible Enterprise Cloud Made Simple 
www.OpenNebula.org | rsmontero at opennebula.org | @OpenNebula 




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