Open Stack

Hi yongiman:

I wander what’s the difference between your ‘auto HA’ API and ‘evacuate’

------------------------------------------------------------
Lingxian Kong
Huawei Technologies Co.,LTD.
IT Product Line CloudOS PDU
China, Xi'an
Mobile: +86-18602962792
Email: konglingxian at huawei.com

From: yongiman at gmail.com [mailto:yongiman at gmail.com]
Sent: Tuesday, August 13, 2013 9:12 PM
To: OpenStack Development Mailing List
Cc: OpenStack Development Mailing List
Subject: Re: [openstack-dev] 答复: Proposal for approving Auto HA development blueprint.

For realizing auto HA function, we need monitoring service like ceilometer.


Ceilometer monitors status of compute nodes ( network interface..connection, healthcheck,,etc,,)


What I focus on is that this operation goes on automatically.


Nova expose auto ha API. When nova received a auto api call. VMs automatically migrate to auto ha host.( which is extra compute node for only auto ha)


All of information of auto ha is stored in auto_ha_hosts table.



In this tables, used column of auto ha hosts is changed to true


Administrator check broken compute node and fix( or replace ) the compute node.


After fixing the compute node, VMs is migrating to operating compute nodes. Now auto ha host is empty again.



When the number of runnning VMs in the auto ha host is zero, used column is replaced to false for using again by periodic task.


Combination with monitoring service is important. Howerver in this blueprint, I want to realize nova's auto ha operation.


My wiki page is still building now, I will fill out as soon as possbile.


I am expecting your advices . Thank you very much~!




Sent from my iPad

On 2013. 8. 13., at 오후 8:01, balaji patnala <patnala003 at gmail.com<mailto:patnala003 at gmail.com>> wrote:
Potential candidate as new service like Ceilometer, Heat etc for OpenStack and provide High Availability of VMs. Good topic to discuss at Summit for implementation post Havana Release.
On Tue, Aug 13, 2013 at 12:03 PM, Alex Glikson <GLIKSON at il.ibm.com<mailto:GLIKSON at il.ibm.com>> wrote:
Agree. Some enhancements to Nova might be still required (e.g., to handle resource reservations, so that there is enough capacity), but the end-to-end framework probably should be outside of existing services, probably talking to Nova, Ceilometer and potentially other components (maybe Cinder, Neutron, Ironic), and 'orchestrating' failure detection, fencing and recovery.
Probably worth a discussion at the upcoming summit.


Regards,
Alex



From:        Konglingxian <konglingxian at huawei.com<mailto:konglingxian at huawei.com>>
To:        OpenStack Development Mailing List <openstack-dev at lists.openstack.org<mailto:openstack-dev at lists.openstack.org>>,
Date:        13/08/2013 07:07 AM
Subject:        [openstack-dev] 答复:  Proposal for approving Auto HA development        blueprint.
________________________________



Hi yongiman:

Your idea is good, but I think the auto HA operation is not OpenStack’s business. IMO, Ceilometer offers ‘monitoring’, Nova  offers ‘evacuation’, and you can combine them to realize HA operation.

So, I’m afraid I can’t understand the specific implementation details very well.

Any different opinions?

发件人: yongiman at gmail.com<mailto:yongiman at gmail.com> [mailto:yongiman at gmail.com]
发送时间: 2013年8月12日 20:52
收件人: openstack-dev at lists.openstack.org<mailto:openstack-dev at lists.openstack.org>
主题: Re: [openstack-dev] Proposal for approving Auto HA development blueprint.



Hi,

Now, I am developing auto ha operation for vm high availability.

This function is all progress automatically.

It needs other service like ceilometer.

ceilometer monitors compute nodes.

When ceilometer detects broken compute node, it send a api call to Nova,
nova exposes for auto ha API.

When received auto ha call, nova progress auto ha operation.

All auto ha enabled VM where are running on broken host are all migrated to auto ha Host which is extra compute node for using only Auto-HA function.

Below is my blueprint and wiki page.

Wiki page is not yet completed. Now I am adding lots of information for this function.

Thanks

https://blueprints.launchpad.net/nova/+spec/vm-auto-ha-when-host-broken

https://wiki.openstack.org/wiki/Autoha_______________________________________________
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