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

learn/learn-kubernetes-master/kiamol/ch14/lab/README.md

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+# Ch14 lab
+
+## Setup
+
+Deploy the monitoring subsystem:
+
+```
+kubectl apply -f lab/monitoring/
+```
+
+> Browse to the Prometheus UI - there are no targets
+
+## Sample Solution
+
+This is the background info:
+
+- Prometheus is [configured](./monitoring/prometheus-config.yaml) to find targets in the namespace `kiamol-ch14-lab`
+
+- all exporters are listed on the [Prometheus docs](https://prometheus.io/docs/instrumenting/exporters/)
+
+- the [Elasticsearch exporter](https://github.com/justwatchcom/elasticsearch_exporter) exposes metrics on port 9114.
+
+My solution is in [elasticsearch.yaml](./solution/elasticsearch.yaml).
+
+Create the namespace and deploy the app:
+
+```
+kubectl create ns kiamol-ch14-lab
+
+kubectl apply -f lab/elasticsearch.yml -n kiamol-ch14-lab
+```
+
+> Back in Prometheus you'll see the target added, with about 300 new metrics
+
+`elasticsearch_cluster_health_up` is the most basic, it should return `1` and show the version info in the labels:
+
+![Prometheus metrics from the Elasticsearch exporter](./docs/prometheus.png)
+
+## Teardown
+
+Remove the namespaces and that removes everything:
+
+```
+kubectl delete ns kiamol-ch14-lab
+
+kubectl delete ns kiamol-ch14-lab-monitoring
+```

learn/learn-kubernetes-master/kiamol/ch14/lab/elasticsearch.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: elasticsearch
+spec:
+  selector:
+    matchLabels:
+      app: elasticsearch
+  template:
+    metadata:
+      labels:
+        app: elasticsearch
+    spec:
+      containers:
+      - image: kiamol/ch13-elasticsearch
+        name: elasticsearch

learn/learn-kubernetes-master/kiamol/ch14/lab/monitoring/namespace.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: kiamol-ch14-lab-monitoring
+  labels:
+    kiamol: ch14

learn/learn-kubernetes-master/kiamol/ch14/lab/monitoring/prometheus-config.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: prometheus-config
+  namespace: kiamol-ch14-lab-monitoring
+data:
+  prometheus.yml: |-
+    global:
+      scrape_interval: 30s
+     
+    scrape_configs:
+      - job_name: 'lab-pods'
+        kubernetes_sd_configs:
+        - role: pod 
+        relabel_configs:
+        - source_labels: 
+            - __meta_kubernetes_namespace
+          action: keep
+          regex: kiamol-ch14-lab
+        - source_labels: 
+            - __meta_kubernetes_pod_annotationpresent_prometheus_io_port
+            - __address__
+            - __meta_kubernetes_pod_annotation_prometheus_io_port
+          action: replace
+          regex: true;([^:]+)(?::\d+)?;(\d+)
+          replacement: $1:$2
+          target_label: __address__
+        - source_labels: 
+            - __meta_kubernetes_pod_labelpresent_app
+            - __meta_kubernetes_pod_label_app
+          regex: true;(.*)
+          target_label: job
+        - source_labels: 
+            - __meta_kubernetes_pod_name
+          target_label: instance
+        - source_labels: 
+            - __meta_kubernetes_pod_labelpresent_version
+            - __meta_kubernetes_pod_label_version
+          regex: true;(.*)
+          target_label: version

learn/learn-kubernetes-master/kiamol/ch14/lab/monitoring/prometheus-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: prometheus
+  namespace: kiamol-ch14-lab-monitoring
+spec:
+  selector: 
+    app: prometheus
+  type: LoadBalancer  
+  ports:
+    - port: 9090
+      targetPort: 9090

learn/learn-kubernetes-master/kiamol/ch14/lab/monitoring/prometheus.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: prometheus
+  namespace: kiamol-ch14-lab-monitoring
+spec:
+  selector:
+    matchLabels:
+      app: prometheus
+  template:
+    metadata:
+      labels:
+        app: prometheus
+    spec:
+      serviceAccountName: prometheus
+      containers:
+        - name: prometheus
+          image: prom/prometheus:v2.19.2
+          args:
+            - "--config.file=/config/prometheus.yml"
+            - "--web.enable-lifecycle"
+          ports:
+            - containerPort: 9090
+          volumeMounts:
+            - name: prometheus-config
+              mountPath: /config/
+      volumes:
+        - name: prometheus-config
+          configMap:
+            name: prometheus-config
+---
+# RBAC configuration - ignore this until we get to chapter 17 :)
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: prometheus
+  namespace: kiamol-ch14-lab-monitoring
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRole
+metadata:
+  name: prometheus
+  labels:
+    kiamol: ch14
+rules:
+- apiGroups: [""]
+  resources:
+  - nodes
+  - services
+  - endpoints
+  - pods
+  verbs: ["get", "list", "watch"]
+- apiGroups: [""]
+  resources:
+  - configmaps
+  verbs: ["get"]
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRoleBinding
+metadata:
+  name: prometheus
+  labels:
+    kiamol: ch14
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: prometheus
+subjects:
+- kind: ServiceAccount
+  name: prometheus
+  namespace: kiamol-ch14-lab-monitoring

learn/learn-kubernetes-master/kiamol/ch14/lab/solution/elasticsearch.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: elasticsearch
+spec:
+  selector:
+    matchLabels:
+      app: elasticsearch
+  template:
+    metadata:
+      labels:
+        app: elasticsearch
+        version: "6.8.10"
+      annotations:
+        prometheus.io/port: "9114"
+    spec:
+      containers:
+      - name: elasticsearch
+        image: kiamol/ch13-elasticsearch
+      - name: exporter
+        image: justwatch/elasticsearch_exporter:1.1.0
+        ports:
+          - name: metrics
+            containerPort: 9114