[ovirt-users] Re: oVirt MAC Pool question

Hi Dominik, Thank you – please find the sql query output file attached. In addition, today, while spawning set of VMs, and we are mostly using Ansible (98% of the time), we got this message: An exception occurred during task execution. To see the full traceback, use -vvv. The error was: ovirtsdk4.Error: Fault reason is "Operation Failed". Fault detail is "[MAC Address 56:6f:ef:88:0b:23 is already in use by VM or snapshot: fred-appcloud.]". HTTP response code is 409. fatal: [suilen-th-scalernode3.avinity.tv -> localhost]: FAILED! => {"changed": false, "msg": "Fault reason is \"Operation Failed\". Fault detail is \"[MAC Address 56:6f:ef:88:0b:23 is already in use by VM or snapshot: fred-appcloud.]\". HTTP response code is 409."} The mac addresses are not defined in ovirt_vm or cloud_init_nics module, we always let oVirt assign mac address.

In addition, I have enabled “deny duplicates;” and “one-lease-per-client;” on our isc-dhcp for subnet, in order to try to prevent this. As mentioned in previous email, I have already switched last week to having unique pool per cluster and here are the ranges: [root@ovirt-engine ~]# /usr/share/ovirt-engine/dbscripts/engine-psql.sh -c "select from_mac, to_mac from mac_pools, mac_pool_ranges where id=mac_pool_id" from_mac | to_mac -------------------+------------------- 56:6f:ef:88:00:00 | 56:6f:ef:88:ff:ff 56:6f:ef:86:00:00 | 56:6f:ef:86:ff:ff 56:6f:ef:82:00:00 | 56:6f:ef:82:ff:ff 56:6f:ef:84:00:00 | 56:6f:ef:84:ff:ff Kindly awaiting your reply. If additional information is required, I will be happy to provide. ----- kind regards/met vriendelijke groeten Marko Vrgotic Sr. System Engineer @ System Administration ActiveVideo *o: *+31 (35) 6774131 *e:* m.vrgotic(a)activevideo.com *w: *www.activevideo.com ActiveVideo Networks BV. 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If you have received this message in error, please immediately notify the sender and/or ActiveVideo Networks, LLC by telephone at +1 408.931.9200 and delete or destroy any copy of this message. *From: *Dominik Holler <dholler(a)redhat.com&gt; *Date: *Monday, 3 February 2020 at 10:11 *To: *"Vrgotic, Marko" <M.Vrgotic(a)activevideo.com&gt; *Cc: *Yedidyah Bar David <didi(a)redhat.com&gt;, &quot;users(a)ovirt.org&quot; < users(a)ovirt.org&gt; *Subject: *Re: [ovirt-users] oVirt MAC Pool question On Fri, Jan 31, 2020 at 9:56 AM Vrgotic, Marko <M.Vrgotic(a)activevideo.com&gt; wrote: Dear Yedidyah, We are actually seeing collisions, which is why I reached out in first place. Strange is that is did not happen since few weeks ago, and since then I saw it multiple times. I am interested in reproducing this issue. Can you please describe how this situation was created? Are the related virtual NICs created in oVirt, or are they imported? Is it still possible to create duplicates, or do you have a backup of the db during this period? Can you please share the output of /usr/share/ovirt-engine/dbscripts/engine-psql.sh -c "select vm_interface.mac_addr,vm_interface.vm_guid,vm_interface.name,vm_static.cluster_id,cluster.mac_pool_id,mac_pools.allow_duplicate_mac_addresses,mac_pool_ranges.from_mac,mac_pool_ranges.to_mac from (((( vm_interface left join vm_static on vm_interface.vm_guid = vm_static.vm_guid) left join cluster on vm_static.cluster_id = cluster.cluster_id) left join mac_pools on cluster.mac_pool_id = mac_pools.id) left join mac_pool_ranges on mac_pools.id = mac_pool_ranges.mac_pool_id) order by vm_interface.mac_addr;" and point us to the virtual NICs or VMs which contained the duplicated MACs? For now I am simply going to create new mac pool for each of the clusters and switch to it, hoping it's not going to affect existing VMs. This will affect only newly created virtual NICs. Regarding planning, if I would have known, that same mac pool is created across datacenters/clusters, I would have taken it into account. Even the mac pool is shared, the mac addresses should be unique across all datacenters managed by a single oVirt Engine. Relying on common sense, I just did not expect this to be the case, but to my fault I should have applied trust-but-verify approach. ----- kind regards/met vriendelijke groeten Marko Vrgotic Sr. System Engineer ActiveVideo e: m.vrgotic(a)activevideo.com On 26/01/2020, 07:45, "Yedidyah Bar David" <didi(a)redhat.com&gt; wrote: On Thu, Jan 23, 2020 at 2:30 PM Vrgotic, Marko <M.Vrgotic(a)activevideo.com&gt; wrote: > > Hi Yedidyah, > > Thank you for you update. > > This platform started with 4.3 deployment. > The Default mac address pool, apparently on all Clusters (5) is: > from_mac | to_mac > -------------------+------------------- > 56:6f:ef:88:00:00 | 56:6f:ef:88:ff:ff > I think I misled you, or for some reason didn't understand your original post. The default pool is for "everything". I thought you refer to different setups - separate engines - and the bug I mentioned about changing the default was addressed at this scenario. Inside a single engine, there is only one default. You should not see collisions *inside* it. Do you? The engine should know no to allocated the same mac to two different NICs. > Interestingly enough, I am alos not able to add another mac pool to Default. I can only create new one, Correct. > let's say MacPool2 and also create only single pool inside. Option to add second mac range under same name is grayed out, whether I login as SuperUser or Admin to Aministration Portal. Indeed. You can only change it, not add a new one with the same name. > > Never mind, it is as so, but I am still not "happiest" with: > > Question2: Would there be an harming effect on existing VMs if the default mac pool would be changed? > => I am pretty certain it's harmless, but didn't try that myself. > Reason is that I have 600VMs on 5 cluster setup in production - If I make the change where currently required and we are wrong, its going to affect almost half of those existing VMs. I did test the change on the staging, and it did not seem to have any harmful effect but that one has like 5VMs atm. > > I will run some additional tests on staging to see if I can get more comfortable before making change in production, but if anyone else can contribute boosting the confidence, please let me know. Ccing Dominik from the network team. I am pretty certain that people do change/add pools live, but guess not often - I guess most people plan ahead and then don't touch. Groetjes, -- Didi