Message: 7
Date: Thu, 3 Nov 2016 16:50:54 +0000
From: Jay Faulkner <j...@jvf.cc <mailto:j...@jvf.cc>>
To: "OpenStack Development Mailing List (not for usage questions)"
<openstack-dev@lists.openstack.org
<mailto:openstack-dev@lists.openstack.org>>
Subject: Re: [openstack-dev] [nova][ironic] Instance can "migrate" to
another node?
Message-ID: <1417f96d-bea5-457a-ba27-96511cbcb...@jvf.cc
<mailto:1417f96d-bea5-457a-ba27-96511cbcb...@jvf.cc>>
Content-Type: text/plain; charset="utf-8”
Thanks a lot, this very helpful for me.
⌘
> Hey,
>
> This is all detailed in the release notes for nova here:
> http://docs.openstack.org/releasenotes/nova/newton.html#new-features
> <http://docs.openstack.org/releasenotes/nova/newton.html#new-features> ? just
> search for ?Ironic?.
>
> Here is the relevant section:
> "Note that instances will still be owned by the same nova-compute service for
> the entire life of the instance, and so the ironic node that instance is on
> will also be managed by the same nova-compute service until the node is
> deleted. This also means that removing a nova-compute service will leave
> instances managed by that service orphaned, and as such most instance actions
> will not work until a nova-compute service with the same hostname is brought
> (back) online.
>
> When nova-compute services are brought up or down, the ring will eventually
> re-balance (when the resource tracker runs on each compute). This may result
> in duplicate compute_node entries for ironic nodes while the nova-compute
> service pool is re-balancing. However, because any nova-compute service
> running the ironic virt driver can manage any ironic node, if a build request
> goes to the compute service not currently managing the node the build request
> is for, it will still succeed.?
>
> So essentially what this means is that for provisioned instances, there?s no
> way to migrate them off of a failed compute host, but unprovisioned node
> capacity will rebalance automatically between compute hosts when you
> provision a new one. Essentially if you have a nova compute host fail but
> want to be able to continue managing instances deployed by it, you?ll have to
> build another nova-compute host with the same hostname (or CONF.host setting)
> in order to do anything beyond deleting it.
>
> Hope this helps,
> Jay Faulkner
> OSIC
>
>> On Nov 3, 2016, at 3:12 AM, c1 <c1...@yahoo.com <mailto:c1...@yahoo.com>>
>> wrote:
>>
>> Hi al,
>>
>> Now, nova?s ironic driver can allow multiple compute services.
>>
>> I am not sure that, when a compute node is down.
>>
>> The instances running in it, whether can ?migrate? to another compute
>> node(use ironic driver)?
>>
>>
>>
>> Thanks
>>
>> C1dx
>>
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