Automatic merge from submit-queue. 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: Set the kubelet `--resolv-conf` flag conditionally on init **What this PR does / why we need it**: `kubeadm init` detects if systemd-resolved is running and configures the kubelet to use a working resolv.conf. This patch also removes the warning message prompting manual user action for this configuration. /area kubeadm /area kubelet /area dns /kind bug /priority important-soon /sig cluster-lifecycle /assign @timothysc **Which issue(s) this PR fixes** Fixes https://github.com/kubernetes/kubeadm/issues/845 **Special notes for your reviewer**: See the difference in `KUBELET_KUBEADM_ARGS` when running with this build and enabling the resolved daemon on Ubuntu 17.10: ```bash root@vagrant:/vagrant/bin# bash << EOF systemctl start systemd-resolved ./845_kubeadm init |& tail -n5 cat /var/lib/kubelet/kubeadm-flags.env ./845_kubeadm reset --force |& tail -n2 systemctl stop systemd-resolved echo nameserver 8.8.8.8 > /etc/resolv.conf ./845_kubeadm init |& tail -n5 cat /var/lib/kubelet/kubeadm-flags.env EOF You can now join any number of machines by running the following on each node as root: kubeadm join 10.0.2.15:6443 --token 77q84j.0342evur7rrfrwwx --discovery-token-ca-cert-hash sha256:190040f9c3adf8410bc6766dac79f8679870190564e15e8f8d1704fafa03f678 KUBELET_KUBEADM_ARGS=--cgroup-driver=cgroupfs --cni-bin-dir=/opt/cni/bin --cni-conf-dir=/etc/cni/net.d --network-plugin=cni --resolv-conf=/run/systemd/resolve/resolv.conf I0603 06:49:16.592482 14106 reset.go:276] [reset] deleting contents of config directories: [/etc/kubernetes/manifests /etc/kubernetes/pki] I0603 06:49:16.592858 14106 reset.go:290] [reset] deleting files: [/etc/kubernetes/admin.conf /etc/kubernetes/kubelet.conf /etc/kubernetes/bootstrap-kubelet.conf /etc/kubernetes/controller-manager.conf /etc/kubernetes/scheduler.conf] You can now join any number of machines by running the following on each node as root: kubeadm join 10.0.2.15:6443 --token 8mdart.gp67vq3nh9urq4z5 --discovery-token-ca-cert-hash sha256:da6b2e5841546eae134524b045e782f0dd91a6b53becc8d69c15d9eab9c88758 KUBELET_KUBEADM_ARGS=--cgroup-driver=cgroupfs --cni-bin-dir=/opt/cni/bin --cni-conf-dir=/etc/cni/net.d --network-plugin=cni ``` **Release note**: ```release-note `kubeadm init` detects if systemd-resolved is running and configures the kubelet to use a working resolv.conf. ``` |
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WORKSPACE |
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