SpringBoot配置文件引用环境变量，利用K8S注入环境变量

利用K8S可以给容器注入环境变量，因此需要将数据库等一些可能与环境有关的抽离出来，利用k8s的configmap注入（Dockerfile也可以注入环境变量）。

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利用${}读取环境变量如果不存在则引用:后面的本地配置
K8s &example

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hpmd-auth
  namespace: dev
spec:
  selector:
    matchLabels:
      app: hpmd-auth
  replicas: 1 # tells deployment to run 4 pods matching the template
  template: # create pods using pod definition in this template
    metadata:
      labels:
        app: hpmd-auth
    spec:
      containers:
        - name: hpmd-auth
          image: ${CICD_IMAGE}:${CICD_EXECUTION_ID}
          ports:
            - containerPort: 9000
              name: server
          imagePullPolicy: Always
          envFrom:
            - configMapRef:
                name: config-map
      imagePullSecrets:
        - name: docker-secret

在k8s里面创建ConfigMap

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