MON Operation Overview

K8s 기반의 Node.js API Front-End System Overview

K8s Deployment Current Status

# kubectl get pods -o wide |grep monitor-nodejs
monitor-nodejs-f68967947-qz7bm           1/1     Running   0          5d23h   10.244.4.6     tb3-docker   <none>           <none>
monitor-nodejs-f68967947-vrchl           1/1     Running   0          5d23h   10.244.4.5     tb3-docker   <none>           <none>

Node.js Deployment yaml

역할 : Node.js API POD를 배포하는 Deployment를 작성한다.

# cat mon_nodejs.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nodejs
  name: monitor-nodejs
spec:
  replicas: 2
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  selector:
    matchLabels:
      app: nodejs
  template:
    metadata:
      labels:
        app: nodejs
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: servertype
                operator: NotIn
                values:
                - master
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - nodejs
            topologyKey: "kubernetes.io/hostname"
      volumes:
      - name: mon-home-volume
        persistentVolumeClaim:
          claimName: mon-home-volume-pvc
      dnsPolicy: "None"
      dnsConfig:
        nameservers:
         - 8.8.8.8
         - 61.100.0.136
         - 61.100.0.252
      containers:
      - image: harbor.hongsnet.net/monitor/monitoring-nodejs:20220801_24
        imagePullPolicy: IfNotPresent
        name: monitor-nodejs
        volumeMounts:
         - mountPath: /home
           name: mon-home-volume
      imagePullSecrets:
        - name: harbor-login

Node.js API HPA Scale yaml

역할 : AutoScaling 정책을 작성한다.

# cat mon_scale_nodejs.yaml
apiVersion: autoscaling/v1
kind: HorizontalPodAutoscaler
metadata:
  name: nodejs-hpa
  namespace: default
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: monitor-nodejs
  minReplicas: 2
  maxReplicas: 3
  targetCPUUtilizationPercentage: 50

Node.js API Service yaml

역할 : Node.js API Service를 작성한다. 여기서는 NodePort 방식을 통해 배포한다.

# cat mon_service_nodejs.yaml
apiVersion: v1
kind: Service
metadata:
  name: monitor-nodejs
spec:
  externalTrafficPolicy: Local
  type: NodePort
  selector:
    app: nodejs
  ports:
    - name: nodejs
      port: 8081
      targetPort: 8081
      nodePort: 32001

실행

배포 및 관리는 여러 가지 방법이 있지만, 여기서는 kubectl 을 사용하여 실행한다.

• 시작 스크립트

# cat start-mon_nodejs.sh
#!/bin/bash

kubectl create -f mon_nodejs.yaml
kubectl create -f mon_scale_nodejs.yaml
kubectl create -f mon_service_nodejs.yaml

실행결과는 다음과 같다.

# ./start-mon_nodejs.sh
deployment.apps/monitor-nodejs created
horizontalpodautoscaler.autoscaling/nodejs-hpa created
service/monitor-nodejs created

• 중지 스크립트

# cat stop-mon_nodejs.sh
#!/bin/bash

kubectl delete -f mon_service_nodejs.yaml
kubectl delete -f mon_scale_nodejs.yaml
kubectl delete -f mon_nodejs.yaml

실행결과는 다음과 같다.

# ./stop-mon_nodejs.sh
service "monitor-nodejs" deleted
horizontalpodautoscaler.autoscaling "nodejs-hpa" deleted
deployment.apps "monitor-nodejs" deleted