Hello, Network configuration for an ovirt host is managed by VDSM. If you try to make changes manually, such as through calling nmcli or manually editing the network scripts via an ssh session on each host, VDSM will just reset everything back to the configuration it had before. (It's on a timer, and it will also happen if VDSM / the host restarts.) To make permanent changes to the network configuration, you'll need to configure the IP addresses / VLANs through the web admin interface for each host. The steps to do this safely are: Go to web admin, Main menu -> Compute -> Hosts. For each host, 1. Migrate or power off all running VMs. (You can see and control each VM running on a host by clicking on the host's name and selecting the "Virtual Machines" tab.) 2. Put the host into maintenance. 3. Click on the host's name and then go to the Network Interfaces tab. 4. Click on the "Setup Host Networks" button. For each interface listed on the dialog, there is a pencil icon on the far right. Click on that pencil to edit the configuration for that interface. 5. Make your changes as desired. A couple things to note: Be careful about where you define a gateway, it will effect the host's routing table and can prevent the engine from being able to contact that host. The engine will not validate the IP configuration on the UI screen. I.e. You can set any IP address / subnet mask even if it doesn't match the network address / subnet mask of any other host on the same logical network. Nor will the engine protect against reusing an IP of an existing host on the network. (Regardless if said host is registered with the engine.) Be careful when you type in those addresses. They are functionally just a text box. 6. Once your changes are done make sure that the "Verify connectivity between Host and Engine" and "Save network configuration" check boxes are checked then, click on the OK button. 7. Wait a few minutes. The engine will update the interfaces and the display in the host list. If the engine cannot complete the network changes, it should revert them back to what they were originally. As a side note because the engine doesn't make this very clear in the UI: If you want to change the network used for the various roles, (storage, VM, console, management, default gateway, migration) you do so at the cluster level. (Main menu-> Compute -> Clusters -> Cluster name -> Logical Networks) The roles are assigned to virtual networks, not the interfaces on each host. - Patrick Hibbs On Sat, 2022-02-19 at 01:09 +0000, Abe E wrote:

I had to do this for a number of hosts last year. I put the host into maintenance, and then removed it. I used 'nmtui' to change the hostname. (Changing hostname suffix from two digits to three digits) (Probably could have used hostnamectl) I change directory to /var/lib/vdsm/persistence/netconf/nets/ and edited the appropriate files. I rebooted the host. I logged back in, and checked the results. I re-added the host to the datacenter. -----Original Message----- From: Abe E <aellahib(a)gmail.com&gt; Sent: Friday, February 18, 2022 7:09 PM To: users(a)ovirt.org Subject: [ovirt-users] ovirtmgmt VLAN and IP Change Hello All, So due to some issues with provisioning new networks in our lab, I have to use a different VLAN in for my ovirt cluster. Cluster -> 3 Hosts (Hyperconverged) What I want to do is essentially change the Ovirtmgmt interface to another vlan but also change the IP Schemes, I wont be needing to change the storage network vlans. I am just wondering how this is done safely. Can I through the engine, put the host 1 by 1 into maint mode and manually adjust the IPs and apply and reconfigure the switch port? What about the IP that the engine has set or would I change that manually through console once I change the ovirtmgmt vlan on all the nodes? _______________________________________________ Users mailing list -- users(a)ovirt.org To unsubscribe send an email to users-leave(a)ovirt.org Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/5JTGYJ6K5CD...