[ovirt-users] Re: Host deploy failure: Configure OVN for oVirt

I had this same issue on oVirt Node 4.5.5, however, I did not see the same code in /usr/share/ovirt-engine/ansible-runner-service-project/project/roles/ovirt-provider-ovn-driver/tasks/configure.yml on the hosted engine. On my version 4.5.5, I have two blocks: one installs ovs and ensures Open vSwitch is started, the second block installs the ovirt-provider-ovn-driver and configures OVN (as well as some other steps).

For the first block, my when statement shows as: when: - cluster_switch == "ovs" or (ovn_central is defined)

For the second block, it shows: when: - ovn_central is defined In Ansible, inside a when: statement, multiple lines beginning with "-" are equivalent to AND conditions. For example: when: - this == true - that == true This would be equivalent to when: (this == true) and (that == true).

I didn't want to toy with the control logic, but I realized that this was a non-issue. The error in this occurs in the Configuring OVN step, which in my configure.yml is near the end of the second block. The when statements are working fine, otherwise it wouldn't be executing those steps. I dug in further, and the issue comes about when the installer attempts to run: vdsm-tool config-ovn <IP-Central> <FQDN> ! I tried this on my own system: [root@b-drone11 ~]# vdsm-tool ovn-config 10.99.8.31 b-drone11.arcc.uwyo.edu Traceback (most recent call last): File "/usr/lib/python3.9/site-packages/vdsm/tool/ovn_config.py", line 117, in get_network return networks[net_name] KeyError: 'b-drone11.arcc.uwyo.edu' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/usr/bin/vdsm-tool", line 195, in main return tool_command[cmd]["command"](*args) File "/usr/lib/python3.9/site-packages/vdsm/tool/ovn_config.py", line 63, in ovn_config ip_address = get_ip_addr(get_network(network_caps(), net_name)) File "/usr/lib/python3.9/site-packages/vdsm/tool/ovn_config.py", line 119, in get_network raise NetworkNotFoundError(net_name) vdsm.tool.ovn_config.NetworkNotFoundError: b-drone11.arcc.uwyo.edu It's the same error as in the host-deploy logs. If you dig in a bit more, you'll find in the ovn_config.py script referred to by the above output, there's a function get_networks() that is throwing the error: def get_network(net_caps, net_name): networks = net_caps['networks'] try: return networks[net_name] except KeyError: raise NetworkNotFoundError(net_name) Digging in EVEN further, if you look at where the function is called and how the "net_name" variable comes in, you'll find that it's only run when a FQDN is given as an argument to vdsm-tool ovn-config instead of an IP: if is_ipaddress(args[2]): ip_address = args[2] else: net_name = args[2] ip_address = get_ip_addr(get_network(network_caps(), net_name)) if not ip_address: raise IpAddressNotFoundError(net_name)

Now, this is as far I got. As far as WHY the get_network() function isn't working, I haven't looked further into the ovirt code and can't say. But it appears somehow this function fails when attempting to resolve FQDN's. Which brings me to the WORKAROUND!

Since the error lies in translating a FQDN to an IP, if you instead provide an IP address in the first place, it completely bypasses the buggy get_networks() function, and lets you add a host.

So, when you run the host deploy, if you add the host using it's IP address vs. its FQDN, it goes through fine, and I've tested this on my cluster and it worked beautifully. The only caveat is you can't add with the FQDN, but for now, our cluster is up and working.

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