Kustomize kubeadm.yaml config file (#193)

Signed-off-by: Rivera Gonzalez, Julio C <julio.c.rivera.gonzalez@intel.com>

clr-k8s-examples/create_stack.sh

@@ -43,23 +43,19 @@ function finish() {
 trap finish EXIT
 
 function cluster_init() {
+	# Config replacements
 	if ! [ -z ${TOKEN} ]; then
-		sed -i "/InitConfiguration/a bootstrapTokens:\\n- token: ${TOKEN}" ./kubeadm.yaml
+		sed -i "/InitConfiguration/a bootstrapTokens:\\n- token: ${TOKEN}" ./kubeadm/base/kubeadm.yaml
 	fi
 	if ! [ -z ${MASTER_IP} ]; then
-		sed -i "/InitConfiguration/a localAPIEndpoint:\\n  advertiseAddress: ${MASTER_IP}" ./kubeadm.yaml
+		sed -i "/InitConfiguration/a localAPIEndpoint:\\n  advertiseAddress: ${MASTER_IP}" ./kubeadm/base/kubeadm.yaml
 	fi
-
+	if [[ -n "$K8S_VER" && $(grep -c kubernetesVersion ./kubeadm/base/kubeadm.yaml) -eq 0 ]]; then
+		sed -i "s/ClusterConfiguration/ClusterConfiguration\nkubernetesVersion: ${K8S_VER}/g" ./kubeadm/base/kubeadm.yaml
+	fi
+	# Config patches
 	if [[ -n "${HIGH_POD_COUNT}" ]]; then
-		# increase limits in kubelet
-		sed -i "/KubeletConfiguration/a maxOpenFiles\: 1048576" ./kubeadm.yaml
-		sed -i "/KubeletConfiguration/a maxPods\: 5000" ./kubeadm.yaml
-		# increase the address range per node
-		sed -i "/ClusterConfiguration/a controllerManager:\\n  extraArgs:\\n    node-cidr-mask-size: \"20\"" ./kubeadm.yaml
-	fi
-
-	if [[ -n "$K8S_VER" && $(grep -c kubernetesVersion kubeadm.yaml) -eq 0 ]]; then
-		sed -i "s/ClusterConfiguration/ClusterConfiguration\nkubernetesVersion: ${K8S_VER}/g" kubeadm.yaml
+		echo "$(kubectl kustomize ./kubeadm/high-pod-count/)" > ./kubeadm/base/kubeadm.yaml
 	fi
 	#This only works with kubernetes 1.12+. The kubeadm.yaml is setup
 	#to enable the RuntimeClass featuregate
@@ -67,7 +63,7 @@ function cluster_init() {
 		echo "/var/lib/etcd exists! skipping init."
 		return
 	fi
-	sudo -E kubeadm init --config=./kubeadm.yaml
+	sudo -E kubeadm init --config=./kubeadm/base/kubeadm.yaml
 
 	rm -rf "${HOME}/.kube"
 	mkdir -p "${HOME}/.kube"

clr-k8s-examples/kubeadm/base/kubeadm.yaml

@@ -1,8 +1,12 @@
 apiVersion: kubeadm.k8s.io/v1beta1
 kind: InitConfiguration
+metadata:
+  name: init-config
 ---
 apiVersion: kubelet.config.k8s.io/v1beta1
 kind: KubeletConfiguration
+metadata:
+  name: kubelet-config
 cgroupDriver: systemd
 # Allowing for CPU pinning and isolation in case of guaranteed QoS class
 cpuManagerPolicy: static
@@ -15,6 +19,8 @@ kubeReserved:
 ---
 apiVersion: kubeadm.k8s.io/v1beta1
 kind: ClusterConfiguration
+metadata:
+  name: cluster-config
 networking:
   dnsDomain: cluster.local
   podSubnet: 10.244.0.0/16

clr-k8s-examples/kubeadm/base/kustomization.yaml

@@ -0,0 +1,2 @@
+resources:
+- kubeadm.yaml

clr-k8s-examples/kubeadm/high-pod-count/cluster-config.json

@@ -0,0 +1,3 @@
+[
+  {"op": "add", "path": "/controllerManager", "value": {"extraArgs": {"node-cidr-mask-size": "20"}}}
+]

clr-k8s-examples/kubeadm/high-pod-count/kubelet-config.json

@@ -0,0 +1,4 @@
+[
+  {"op": "add", "path": "/maxOpenFiles", "value": 1048576},
+  {"op": "add", "path": "/maxPods", "value": 5000}
+]

clr-k8s-examples/kubeadm/high-pod-count/kustomization.yaml

@@ -0,0 +1,17 @@
+bases:
+- ../base/
+patchesJson6902:
+# increase limits in kubelet
+- target:
+    group: kubelet.config.k8s.io
+    version: v1beta1
+    kind: KubeletConfiguration
+    name: kubelet-config
+  path: kubelet-config.json
+# increase the address range per node
+- target:
+    group: kubeadm.k8s.io
+    version: v1beta1
+    kind: ClusterConfiguration
+    name: cluster-config
+  path: cluster-config.json