openstack team mailing list archive

[Steven Dake <sdake@xxxxxxxxxx>]

On 07/24/2012 10:08 AM, Alessandro Tagliapietra wrote:
> But i don't see any part (except the future plans) talking about HA at instance level, that seems more to an application level
> 

Currently heat's healthchecking is application only, but we do intend to
improve instance healthchecking in v6.  We are currently in our v5
development which concludes on July 30th.  We have 4-5 week development
windows.  I'll make certain vm healthchecking is solid for v6 around
August.  However, we may be able to fit into v5 - I'll have to check
with the main author of the HA feature (Angus Salkeld).

The HA feature HOWTO is described a bit here:

https://github.com/heat-api/heat/wiki/Using-HA

An example HA application template is here:

https://github.com/heat-api/heat/blob/master/templates/WordPress_Single_Instance_With_HA.template

This template launches a wordpress cloud application.  If httpd or mysql
fail, they are restarted.  If they fail 3 times in 5 minutes, the entire
VM is restarted (this is called escalation) under the assumption that
the VM container is defective in some way.

Regards
-steve

> Il giorno 24/lug/2012, alle ore 18:56, Jay Pipes ha scritto:
> 
>> On 07/24/2012 12:52 PM, Alessandro Tagliapietra wrote:
>>> Thank you Jay, never read about that.
>>> Seems something like scalr/chef? WHich handles application and keeps a minimum number of vm running?
>>
>> Yeah, kinda.. just one more way of doing things... :)
>> -jay
> 
> 
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