Description of problem: On ovirt e2e tests we noticed errors on master/worker journal due to: dial tcp: lookup api-int.ovirt1X.gcp.devcluster.openshift.com on 192.168.21X.1:53: no such host" see: 1. https://bugzilla.redhat.com/show_bug.cgi?id=1846529#c18 2. ovirt17-kcphn-worker-0-c2rd4 journal on CI job https://prow.ci.openshift.org/view/gs/origin-ci-test/logs/release-openshift-ocp-installer-e2e-ovirt-4.6/1302427462155636736: cat journal|grep "api-int.*1:53: no such host"|wc -l 945 On ovirt CI 192.168.21X.1 is the upstream DNS, and api-int is resolveable only on CoreDNS. That means that at some points the coreDNS is not available and the node tries to use the Upstream DNS. Additional thoughts: The NetworkManager-resolve-prepender is responsible for adding the coredns to the resolv.conf. As we can see on https://bugzilla.redhat.com/show_bug.cgi?id=1846529#c28 """ by looking at ovirt11-wz8kt-worker-0-5686p workers journal [0]: during this lookup failure we can see : # cat workers-journal | grep nm-dispatcher | grep 'worker-0-5686p' | grep resolv-prepender Aug 16 02:45:15.570577 ovirt11-wz8kt-worker-0-5686p nm-dispatcher[302731]: <13>Aug 16 02:45:15 root: NM resolv-prepender triggered by ens3 dhcp4-change. Aug 16 02:45:17.726649 ovirt11-wz8kt-worker-0-5686p nm-dispatcher[302731]: <13>Aug 16 02:45:17 root: NM resolv-prepender: Prepending 'nameserver 192.168.211.118' to /etc/resolv.conf (other nameservers from /var/run/NetworkManager/resolv.conf) """ It takes 2s to finish, at the begining of the script we copy /var/run/NetworkManager/resolv.conf to /etc/resolv.conf that means that in those 2 seconds we have the wrong DNS and that will lead to unexpected problems.
*** This bug has been marked as a duplicate of bug 1876216 ***