Kubernetes(K8s) 使用 reloader 实现配置热更新

kind: Deployment
metadata:
  annotations:
    configmap.reloader.stakater.com/reload: "foo-configmap,bar-configmap"
spec:
  ...

kind: Deployment
metadata:
  annotations:
    secret.reloader.stakater.com/reload: "foo-secret,bar-secret"
spec:
  ...

kubectl apply -f https://raw.githubusercontent.com/stakater/Reloader/master/deployments/kubernetes/reloader.yaml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: reloader-reloader
  namespace: default
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: reloader-reloader-role
rules:
- apiGroups:
  - ""
  resources:
  - secrets
  - configmaps
  verbs:
  - list
  - get
  - watch
- apiGroups:
  - apps
  resources:
  - deployments
  - daemonsets
  - statefulsets
  verbs:
  - list
  - get
  - update
  - patch
- apiGroups:
  - extensions
  resources:
  - deployments
  - daemonsets
  verbs:
  - list
  - get
  - update
  - patch
- apiGroups:
  - batch
  resources:
  - cronjobs
  verbs:
  - list
  - get
- apiGroups:
  - batch
  resources:
  - jobs
  verbs:
  - create
  - delete
  - list
  - get
- apiGroups:
  - ""
  resources:
  - events
  verbs:
  - create
  - patch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: reloader-reloader-role-binding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: reloader-reloader-role
subjects:
- kind: ServiceAccount
  name: reloader-reloader
  namespace: default
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: reloader-reloader
  namespace: default
spec:
  replicas: 1
  revisionHistoryLimit: 2
  selector:
    matchLabels:
      app: reloader-reloader
  template:
    metadata:
      labels:
        app: reloader-reloader
    spec:
      containers:
      - env:
        - name: GOMAXPROCS
          valueFrom:
            resourceFieldRef:
              divisor: "1"
              resource: limits.cpu
        - name: GOMEMLIMIT
          valueFrom:
            resourceFieldRef:
              divisor: "1"
              resource: limits.memory
        image: "ghcr.io/stakater/reloader:latest"
        imagePullPolicy: IfNotPresent
        livenessProbe:
          failureThreshold: 5
          httpGet:
            path: /live
            port: http
          initialDelaySeconds: 10
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 5
        name: reloader-reloader
        ports:
        - containerPort: 9090
          name: http
        readinessProbe:
          failureThreshold: 5
          httpGet:
            path: /metrics
            port: http
          initialDelaySeconds: 10
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 5
        resources:
          limits:
            cpu: "1"
            memory: 512Mi
          requests:
            cpu: 10m
            memory: 512Mi
        securityContext: {}
      securityContext:
        runAsNonRoot: true
        runAsUser: 65534
        seccompProfile:
          type: RuntimeDefault
      serviceAccountName: reloader-reloader