provision new worker nodes with ansible

ansible/templates/10-kubeadm.j2

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+# Note: This dropin only works with kubeadm and kubelet v1.11+
+[Service]
+Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
+Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
+# This is a file that "kubeadm init" and "kubeadm join" generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically
+EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
+# This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use
+# the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.
+EnvironmentFile=-/etc/default/kubelet
+ExecStart=
+ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS
+StandardOutput=null

ansible/templates/kubelet.j2

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+apiVersion: kubelet.config.k8s.io/v1beta1
+authentication:
+  anonymous:
+    enabled: false
+  webhook:
+    cacheTTL: 0s
+    enabled: true
+  x509:
+    clientCAFile: /etc/kubernetes/pki/ca.crt
+authorization:
+  mode: Webhook
+  webhook:
+    cacheAuthorizedTTL: 0s
+    cacheUnauthorizedTTL: 0s
+cgroupDriver: systemd
+clusterDNS:
+- 10.96.0.10
+clusterDomain: cluster.local
+cpuManagerReconcilePeriod: 0s
+evictionPressureTransitionPeriod: 0s
+fileCheckFrequency: 0s
+healthzBindAddress: 127.0.0.1
+healthzPort: 10248
+httpCheckFrequency: 0s
+imageMinimumGCAge: 0s
+kind: KubeletConfiguration
+logging:
+  flushFrequency: 0
+  options:
+    json:
+      infoBufferSize: "0"
+  verbosity: 0
+memorySwap: {}
+nodeStatusReportFrequency: 0s
+nodeStatusUpdateFrequency: 0s
+rotateCertificates: true
+runtimeRequestTimeout: 0s
+shutdownGracePeriod: 5m
+shutdownGracePeriodCriticalPods: 5m
+staticPodPath: /etc/kubernetes/manifests
+streamingConnectionIdleTimeout: 0s
+syncFrequency: 0s
+volumeStatsAggPeriod: 0s