add more examples

module11/drain-node/drain.MD

@@ -9,13 +9,13 @@ kubectl uncordon
 ```
 
 ```
-curl -v -H 'Content-type: application/json' --key admin.key --cert admin.crt https://192.168.34.2:6443/api/v1/namespaces/default/pods/nginx-deployment-9b44bf4b5-x4xc4/eviction -d @eviction.json
+curl -v -H 'Content-type: application/json' --key client.key --cert client.crt https://192.168.34.2:6443/api/v1/namespaces/default/pods/httpserver-5b5fc75b98-rc2kf/eviction -d @eviction.json
 
 {
   "apiVersion": "policy/v1",
   "kind": "Eviction",
   "metadata": {
-    "name": "nginx-deployment-9b44bf4b5-x4xc4",
+    "name": "httpserver-5b5fc75b98-rc2kf",
     "namespace": "default"
   }
 }

module11/drain-node/pdb.yaml

@@ -3,7 +3,7 @@ kind: PodDisruptionBudget
 metadata:
   name: nginx-deployment
 spec:
-  minAvailable: 0
+  minAvailable: 1
   selector:
     matchLabels:
       app: nginx

module11/hpa/readme.MD

@@ -1,3 +1,6 @@
 ```
-kubectl autoscale deployment php-apache --cpu-percent=50 --min=1 --max=10
+kubectl create -f php-apache.yaml
+kubectl create -f hpav2.yaml
+kubectl run -i --tty load-generator --rm --image=busybox --restart=Never -- /bin/sh -c "while sleep 0.01; do wget -q -O- http://php-apache; done"
+watch kubectl top pods
 ```

module11/operator/kubebuilder.md

@@ -0,0 +1,81 @@
+### create a kubebuilder project, it requires an empty folder
+```
+kubebuilder init --domain cncamp.io
+```
+
+### check project layout
+```
+cat PROJECT
+domain: cncamp.io
+layout:
+- go.kubebuilder.io/v3
+projectName: mysts
+repo: github.com/cncamp/mysts
+version: "3"
+```
+### create API, create resource[Y], create controller[Y]
+```
+kubebuilder create api --group apps --version v1alpha1 --kind SimpleStatefulset
+```
+### open project by IDE and edit api/v1alpha1/simplestatefulset_types.go
+```
+// SimpleStatefulsetSpec defines the desired state of SimpleStatefulset
+type SimpleStatefulsetSpec struct {
+	// INSERT ADDITIONAL SPEC FIELDS - desired state of cluster
+	// Important: Run "make" to regenerate code after modifying this file
+
+	// Foo is an example field of SimpleStatefulset. Edit simplestatefulset_types.go to remove/update
+	Image string `json:"image,omitempty"`
+	Replicas int32 `json:"replicas,omitempty"`
+}
+
+// SimpleStatefulsetStatus defines the observed state of SimpleStatefulset
+type SimpleStatefulsetStatus struct {
+	AvailableReplicas string `json:"availableReplicas,omitempty"`
+	// INSERT ADDITIONAL STATUS FIELD - define observed state of cluster
+	// Important: Run "make" to regenerate code after modifying this file
+}
+```
+### check Makefile
+```
+Build targets:
+    ### create code skeletion
+    manifests: generate crd
+    generate: generate api functions, like deepCopy
+    
+    ### generate crd and install
+    run: Run a controller from your host.
+    install: Install CRDs into the K8s cluster specified in ~/.kube/config.
+    
+    ### docker build and deploy
+    docker-build: Build docker image with the manager.
+    docker-push: Push docker image with the manager.
+    deploy: Deploy controller to the K8s cluster specified in ~/.kube/config.
+
+```
+### generate crd
+```
+make manifests
+```
+### build & install
+```
+make build
+make docker-build
+make docker-push
+make deploy
+```
+## enable webhooks
+### install cert-manager
+```
+kubectl apply -f https://github.com/jetstack/cert-manager/releases/download/v1.6.1/cert-manager.yaml
+```
+### create webhooks
+```
+kubebuilder create webhook --group apps --version v1alpha1 --kind SimpleStatefulset --defaulting --programmatic-validation
+```
+### change code
+### enable webhook in
+```
+config/default/kustomization.yaml
+```
+### redeploy

module11/qos-pods/deployment-min-ready.yaml

@@ -0,0 +1,43 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: centos-qos
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: centos
+  template:
+    metadata:
+      labels:
+        app: centos
+    spec:
+      containers:
+      - command:
+        - tail
+        - -f
+        - /dev/null
+        image: centos
+        name: centos
+        resources:
+          requests:
+            cpu: 250m
+            memory: 1Gi
+          limits:
+            cpu: 250m
+            memory: 1Gi
+        env:
+          - name: SYSTEM_NAMESPACE_ENV
+            valueFrom:
+              fieldRef:
+                fieldPath: metadata.namespace
+          - name: PODIP
+            valueFrom:
+              fieldRef:
+                fieldPath: status.podIP
+          - name: CPU_LIMIT
+            valueFrom:
+              resourceFieldRef:
+                containerName: centos
+                resource: limits.cpu
+                divisor: 1m

module11/vpa/readme.MD

@@ -3,5 +3,24 @@
 git clone https://github.com/kubernetes/autoscaler.git
 ```
 ### install vpa
+```
 cd vertical-pod-autoscaler
 ./hack/vpa-up.sh
+```
+### test vpa
+```
+kubectl apply -f vpa.yaml
+```
+### recommmender run once per min, updater run once per min
+### check updater parameter for rate limit config
+### updater flows
+```
+1. get all pods-> 
+2. get live pods-> 
+3. get pods managed by vpa-> 
+4. add to updater queue-> 
+5. if (within recommend range && no oom) || (oom but resourcediff==0) -->no update
+else pods enqueue with priority-> 
+6. sort by priority -> 
+7. kill with ratelimit configured in command line parameter
+```