新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch20/lab/README.md

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+# Ch20 lab
+
+## Setup
+
+Deploy the custom controller:
+
+```
+kubectl apply -f lab/timecheck-controller/
+```
+
+Try to create custom resource:
+
+```
+kubectl apply -f lab/timecheck-test.yaml
+```
+
+Check the controller logs:
+
+```
+kubectl logs -l app=timecheck-controller --tail 100
+```
+
+> This controller doesn't handle the situation where the CRD doesn't exist, so the container exits and the Pod will keep restarting
+
+## Sample Solution
+
+The [CRD](./solution/timecheck-crd.yaml) specifies the structure of the custom timecheck resource.
+
+```
+kubectl apply -f lab/solution/timecheck-crd.yaml
+```
+
+Restart the controller - it will be in CrashLoopBackOff status by now:
+
+```
+kubectl delete pods -l app=timecheck-controller
+```
+
+Now you can create the custom resource:
+
+```
+kubectl apply -f lab/timecheck-test.yaml
+```
+
+Check the controller has created a Deployment:
+
+```
+kubectl logs -l app=timecheck-controller --tail 4
+```
+
+List the timecheck resources:
+
+```
+kubectl get tc
+```
+
+And check the logs from the timecheck app:
+
+```
+kubectl logs -l app=timecheck -c logger
+```
+
+## Teardown
+
+Delete the CRD:
+
+```
+kubectl delete crd timechecks.ch20.kiamol.net
+```
+
+And the controller:
+
+```
+kubectl delete -f lab/timecheck-controller/
+```

learn/learn-kubernetes-master/kiamol/ch20/lab/solution/timecheck-crd.yaml

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+apiVersion: apiextensions.k8s.io/v1  # minimum 1.16
+kind: CustomResourceDefinition
+metadata:
+  name: timechecks.ch20.kiamol.net
+  labels:
+    kiamol: ch20
+spec:
+  group: ch20.kiamol.net
+  scope: Namespaced
+  names:
+    plural: timechecks
+    singular: timecheck
+    kind: TimeCheck
+    shortNames:
+    - tc
+  versions:
+    - name: v1
+      served: true
+      storage: true
+      schema:
+        openAPIV3Schema:
+          type: object
+          properties:
+            spec:
+              type: object
+              properties:
+                environment:
+                  type: string
+                interval:
+                  type: integer 
+      additionalPrinterColumns:
+        - name: Environment
+          type: string
+          description: Environment
+          jsonPath: .spec.environment
+        - name: Interval
+          type: string
+          description: Interval
+          jsonPath: .spec.interval

learn/learn-kubernetes-master/kiamol/ch20/lab/timecheck-controller/01-service-account.yaml

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+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: timecheck-controller
+  labels:
+    kiamol: ch20-lab
+automountServiceAccountToken: false

learn/learn-kubernetes-master/kiamol/ch20/lab/timecheck-controller/02-rbac.yaml

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+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: timecheck-controller
+  labels:
+    kiamol: ch20-lab
+rules:
+- apiGroups: ["apps"] 
+  resources: ["deployments"]
+  verbs: ["list", "create", "delete"]
+- apiGroups: ["ch20.kiamol.net"] 
+  resources: ["timechecks"]
+  verbs: ["list", "watch"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: timecheck-controller
+  labels:
+    kiamol: ch20-lab
+subjects:
+- kind: ServiceAccount
+  name: timecheck-controller
+  namespace: default
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: timecheck-controller

learn/learn-kubernetes-master/kiamol/ch20/lab/timecheck-controller/03-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: timecheck-controller
+  labels:
+    kiamol: ch20-lab
+spec:
+  selector:
+    matchLabels:
+      app: timecheck-controller
+  template:
+    metadata:
+      labels:
+        app: timecheck-controller
+    spec:
+      serviceAccountName: timecheck-controller
+      automountServiceAccountToken: true
+      containers:
+        - image: kiamol/ch20-timecheck-controller
+          name: controller

learn/learn-kubernetes-master/kiamol/ch20/lab/timecheck-test.yaml

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+apiVersion: "ch20.kiamol.net/v1"
+kind: TimeCheck
+metadata:
+  name: test
+  labels:
+    kiamol: ch20-lab
+spec:
+  environment: TEST
+  interval: 10