[Openstack] VM High Availability and Floating IP

Angus Salkeld asalkeld at redhat.com
Thu Jul 26 02:59:33 UTC 2012


On 24/07/12 12:12 -0700, Steven Dake wrote:
>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).

I have just added a template demonstating an instance sending
healthchecks and getting restarted if it fails to send a healthcheck
within a specified period.

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

(just to give you another option).

-Angus

>
>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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