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fc28923e71
Automatic merge from submit-queue (batch tested with PRs 63673, 63712, 63691, 63684). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. kubeadm - add preflight warning when using systemd-resolved **What this PR does / why we need it**: This PR adds a preflight warning when the host is running systemd-resolved. Newer Ubuntu releases (artful and bionic in particular) run systemd-resolved by default and in the dfeault configuration have an /etc/resolv.conf file that references 127.0.0.53 which is not accessible from containers running on the host. We will now provide a warning to the user to tell them that the kubelet args should include `--resolv-conf=/run/systemd/resolve/resolv.conf`. `/run/systemd/resolve/resolv.conf`. **Which issue(s) this PR fixes**: This does not resolve the following issues, but it does provide better output to the users affected by the issues: https://github.com/kubernetes/kubeadm/issues/273 https://github.com/kubernetes/kubeadm/issues/787 **Release note**: ```release-note NONE ```