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

learn/learn-kubernetes-master/kiamol/ch21/todo-list/msgq/todo-message-queue.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: nats-config
+  labels:
+    kiamol: ch21
+data:
+  nats.conf: |
+    pid_file: "/var/run/nats/nats.pid"
+    http: 8222
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: message-queue
+  labels:
+    app: nats
+    kiamol: ch21
+spec:
+  selector:
+    app: nats
+  clusterIP: None
+  ports:
+  - name: client
+    port: 4222
+  - name: cluster
+    port: 6222
+  - name: monitor
+    port: 8222
+  - name: metrics
+    port: 7777
+  - name: leafnodes
+    port: 7422
+  - name: gateways
+    port: 7522
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: nats
+  labels:
+    app: nats
+    kiamol: ch21
+spec:
+  selector:
+    matchLabels:
+      app: nats
+  replicas: 1
+  serviceName: "nats"
+  template:
+    metadata:
+      labels:
+        app: nats
+    spec:
+      # Common volumes for the containers
+      volumes:
+      - name: config-volume
+        configMap:
+          name: nats-config
+      - name: pid
+        emptyDir: {}
+
+      # Required to be able to HUP signal and apply config reload
+      # to the server without restarting the pod.
+      shareProcessNamespace: true
+
+      #################
+      #               #
+      #  NATS Server  #
+      #               #
+      #################
+      terminationGracePeriodSeconds: 60
+      containers:
+      - name: nats
+        image: nats:2.1.0-alpine3.10
+        ports:
+        - containerPort: 4222
+          name: client
+          hostPort: 4222
+        - containerPort: 7422
+          name: leafnodes
+          hostPort: 7422
+        - containerPort: 6222
+          name: cluster
+        - containerPort: 8222
+          name: monitor
+        - containerPort: 7777
+          name: metrics
+        command:
+         - "nats-server"
+         - "--config"
+         - "/etc/nats-config/nats.conf"
+
+        # Required to be able to define an environment variable
+        # that refers to other environment variables.  This env var
+        # is later used as part of the configuration file.
+        env:
+        - name: POD_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.name
+        - name: POD_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
+        - name: CLUSTER_ADVERTISE
+          value: $(POD_NAME).nats.$(POD_NAMESPACE).svc
+        volumeMounts:
+          - name: config-volume
+            mountPath: /etc/nats-config
+          - name: pid
+            mountPath: /var/run/nats
+
+        # Liveness/Readiness probes against the monitoring
+        #
+        livenessProbe:
+          httpGet:
+            path: /
+            port: 8222
+          initialDelaySeconds: 10
+          timeoutSeconds: 5
+        readinessProbe:
+          httpGet:
+            path: /
+            port: 8222
+          initialDelaySeconds: 10
+          timeoutSeconds: 5
+
+        # Gracefully stop NATS Server on pod deletion or image upgrade.
+        #
+        lifecycle:
+          preStop:
+            exec:
+              # Using the alpine based NATS image, we add an extra sleep that is
+              # the same amount as the terminationGracePeriodSeconds to allow
+              # the NATS Server to gracefully terminate the client connections.
+              #
+              command: ["/bin/sh", "-c", "/nats-server -sl=ldm=/var/run/nats/nats.pid && /bin/sleep 60"]