Open Stack

On Thu, 2021-04-22 at 06:01 +0000, Eugen Block wrote:
> Yeah, the column "node" has the FQDN in my DB, too, only "host" is the  
> short name. The question is how did the short name get into the "node"  
> column, but it will probably be difficult to get to the bottom of that.
well by default we do not expect to have FQDNs in either filed.
novas default  for both is the hostname of the host which will be the short name not the fqdn
unless you set an fqdn in /etc/hostname which is not generally the recommended pratice.

nova in general does nto support changing the hostname(/etc/hostname) of a host and you should avoid
changeing the "host" value in the nova.conf too.

changing these values can result in the creation fo addtional placment RP, compute service records and
compute nodes and that can result in hard to fix situation wehre old vms are using one set of resouce and
new vms are using the updated ones.

so you should not modify either value in the db.

did you perhaps specify a host when live migrating and just pass the wrong value or was the host selected by the
scheduler.
> 
> 
> Zitat von "Szabo, Istvan (Agoda)" <Istvan.Szabo at agoda.com>:
> 
> > I think I found the issue, in the instances nova db in the node  
> > column the compute node name somehow changed to short hostname. It  
> > works fith FQDN but it doesn't work with short ☹ I hope I didn't  
> > mess-up anything if I change to FQDN to make it work.
> > 
> > Istvan Szabo
> > Senior Infrastructure Engineer
> > ---------------------------------------------------
> > Agoda Services Co., Ltd.
> > e: istvan.szabo at agoda.com
> > ---------------------------------------------------
> > 
> > -----Original Message-----
> > From: Szabo, Istvan (Agoda) <Istvan.Szabo at agoda.com>
> > Sent: Thursday, April 22, 2021 11:19 AM
> > To: Eugen Block <eblock at nde.ag>
> > Cc: openstack-discuss at lists.openstack.org
> > Subject: RE: Live migration fails
> > 
> > Sorry, in the log I haven't commented out the servername ☹ it is  
> > xy-osfecn-40250
> > 
> > Istvan Szabo
> > Senior Infrastructure Engineer
> > ---------------------------------------------------
> > Agoda Services Co., Ltd.
> > e: istvan.szabo at agoda.com
> > ---------------------------------------------------
> > 
> > -----Original Message-----
> > From: Eugen Block <eblock at nde.ag>
> > Sent: Wednesday, April 21, 2021 5:37 PM
> > To: Szabo, Istvan (Agoda) <Istvan.Szabo at agoda.com>
> > Cc: openstack-discuss at lists.openstack.org
> > Subject: Re: Live migration fails
> > 
> > The error message seems correct, I can't find am-osfecn-4025 either  
> > in the list of compute nodes. Can you check in the database if  
> > there's an active instance (or several) allocated to that compute  
> > node? In that case you would need to correct the allocation in order  
> > for the migration to work.
> > 
> > 
> > Zitat von "Szabo, Istvan (Agoda)" <Istvan.Szabo at agoda.com>:
> > 
> > > Sure:
> > > 
> > > https://jpst.it/2u3uh
> > > 
> > > These are the one where can't live migrate:
> > > xy-osfecn-40250
> > > xy-osfecn-40281
> > > xy-osfecn-40290
> > > xy-osbecn-40073
> > > xy-osfecn-40238
> > > 
> > > The compute service are disabled on these because we don't want
> > > anybody spawn a vm on these anymore so want to evacuate all vms.
> > > 
> > > Istvan Szabo
> > > Senior Infrastructure Engineer
> > > ---------------------------------------------------
> > > Agoda Services Co., Ltd.
> > > e: istvan.szabo at agoda.com
> > > ---------------------------------------------------
> > > 
> > > -----Original Message-----
> > > From: Eugen Block <eblock at nde.ag>
> > > Sent: Wednesday, April 21, 2021 3:26 PM
> > > To: openstack-discuss at lists.openstack.org
> > > Subject: Re: Live migration fails
> > > 
> > > Hi,
> > > 
> > > can you share the output of these commands?
> > > 
> > > nova-manage cell_v2 list_hosts
> > > openstack compute service list
> > > 
> > > 
> > > Zitat von "Szabo, Istvan (Agoda)" <Istvan.Szabo at agoda.com>:
> > > 
> > > > Hi,
> > > > 
> > > > I have couple of compute nodes where the live migration fails with
> > > > existing vms.
> > > > When I quickly spawn a vm and try live migration it works so I assume
> > > > shouldn't be a big problem with the compute node.
> > > > However I have many existing vms where it fails with a servername  
> > > > not found.
> > > > 
> > > > /var/log/nova/nova-conductor.log:2021-04-21 14:47:12.605 227612 ERROR
> > > > nova.conductor.tasks.migrate
> > > > [req-f4067a26-a233-4673-8c07-9a8a290980b0
> > > > dce35e6eceea4312bb0baa0510cef363 ca7e35079f4440c78bd9870724b9638b -
> > > > default default] [instance: 1517a2ac-3b51-4d8d-80b3-89a5614d1ae0]
> > > > Unable to find record for source node servername on servername:
> > > > ComputeHostNotFound: Compute host servername could not be found.
> > > > /var/log/nova/nova-conductor.log:2021-04-21 14:47:12.605 227612
> > > > WARNING nova.scheduler.utils
> > > > [req-f4067a26-a233-4673-8c07-9a8a290980b0
> > > > dce35e6eceea4312bb0baa0510cef363 ca7e35079f4440c78bd9870724b9638b -
> > > > default default] Failed to compute_task_migrate_server: Compute host
> > > > servername could not be found.: ComputeHostNotFound: Compute host
> > > > servername could not be found.
> > > > /var/log/nova/nova-conductor.log:2021-04-21 14:47:12.605 227612
> > > > WARNING nova.scheduler.utils
> > > > [req-f4067a26-a233-4673-8c07-9a8a290980b0
> > > > dce35e6eceea4312bb0baa0510cef363 ca7e35079f4440c78bd9870724b9638b -
> > > > default default] [instance: 1517a2ac-3b51-4d8d-80b3-89a5614d1ae0]
> > > > Setting instance to ACTIVE state.: ComputeHostNotFound: Compute host
> > > > servername could not be found.
> > > > /var/log/nova/nova-conductor.log:2021-04-21 14:47:12.672 227612 ERROR
> > > > oslo_messaging.rpc.server
> > > > [req-f4067a26-a233-4673-8c07-9a8a290980b0
> > > > dce35e6eceea4312bb0baa0510cef363 ca7e35079f4440c78bd9870724b9638b -
> > > > default default] Exception during message handling:
> > > > ComputeHostNotFound: Compute host am-osfecn-4025
> > > > 
> > > > Tried with this command:
> > > > 
> > > > nova live-migration --block-migrate id.
> > > > 
> > > > Any idea?
> > > > 
> > > > Thank you.
> > > > 
> > > > ________________________________
> > > > This message is confidential and is for the sole use of the intended
> > > > recipient(s). It may also be privileged or otherwise protected by
> > > > copyright or other legal rules. If you have received it by mistake
> > > > please let us know by reply email and delete it from your system. It
> > > > is prohibited to copy this message or disclose its content to anyone.
> > > > Any confidentiality or privilege is not waived or lost by any
> > > > mistaken delivery or unauthorized disclosure of the message. All
> > > > messages sent to and from Agoda may be monitored to ensure compliance
> > > > with company policies, to protect the company's interests and to
> > > > remove potential malware. Electronic messages may be intercepted,
> > > > amended, lost or deleted, or contain viruses.
> > > 
> > > 
> > > 
> > > 
> > > 
> > > ________________________________
> > > This message is confidential and is for the sole use of the intended
> > > recipient(s). It may also be privileged or otherwise protected by
> > > copyright or other legal rules. If you have received it by mistake
> > > please let us know by reply email and delete it from your system. It
> > > is prohibited to copy this message or disclose its content to anyone.
> > > Any confidentiality or privilege is not waived or lost by any mistaken
> > > delivery or unauthorized disclosure of the message. All messages sent
> > > to and from Agoda may be monitored to ensure compliance with company
> > > policies, to protect the company's interests and to remove potential
> > > malware. Electronic messages may be intercepted, amended, lost or
> > > deleted, or contain viruses.
> > 
> > 
> > 
> > 
> > 
> > ________________________________
> > This message is confidential and is for the sole use of the intended  
> > recipient(s). It may also be privileged or otherwise protected by  
> > copyright or other legal rules. If you have received it by mistake  
> > please let us know by reply email and delete it from your system. It  
> > is prohibited to copy this message or disclose its content to  
> > anyone. Any confidentiality or privilege is not waived or lost by  
> > any mistaken delivery or unauthorized disclosure of the message. All  
> > messages sent to and from Agoda may be monitored to ensure  
> > compliance with company policies, to protect the company's interests  
> > and to remove potential malware. Electronic messages may be  
> > intercepted, amended, lost or deleted, or contain viruses.
> 
> 
> 
>