Bind coredns containers to linux nodes to avoid Windows scheduling

cluster/addons/dns/coredns/coredns.yaml.base

@@ -112,6 +112,8 @@ spec:
           effect: NoSchedule
         - key: "CriticalAddonsOnly"
           operator: "Exists"
+      nodeSelector:
+        beta.kubernetes.io/os: linux
       containers:
       - name: coredns
         image: k8s.gcr.io/coredns:1.2.4

cluster/addons/dns/coredns/coredns.yaml.in

@@ -112,6 +112,8 @@ spec:
           effect: NoSchedule
         - key: "CriticalAddonsOnly"
           operator: "Exists"
+      nodeSelector:
+        beta.kubernetes.io/os: linux
       containers:
       - name: coredns
         image: k8s.gcr.io/coredns:1.2.4

cluster/addons/dns/coredns/coredns.yaml.sed

@@ -112,6 +112,8 @@ spec:
           effect: NoSchedule
         - key: "CriticalAddonsOnly"
           operator: "Exists"
+      nodeSelector:
+        beta.kubernetes.io/os: linux
       containers:
       - name: coredns
         image: k8s.gcr.io/coredns:1.2.4

cmd/kubeadm/app/phases/addons/dns/manifests.go

@@ -237,6 +237,8 @@ spec:
         operator: Exists
       - key: {{ .MasterTaintKey }}
         effect: NoSchedule
+      nodeSelector:
+        beta.kubernetes.io/os: linux
       containers:
       - name: coredns
         image: {{ .ImageRepository }}/coredns:{{ .Version }}