Automatic reconstruction of pod after modifying resource object

1 background

User defined Kubernetes Resource object （ for example Deployment、Daemonset etc. ）, Profile to configmap Definition , adopt Volumemounts Mount To Pod in , After the configuration file is modified , The service can automatically reload Load update configuration .

2 Solution

• Limiting conditions ：Kubernetes Version in 1.9 And above
• Cluster installation reloader
• By adding comments annotation The way to achieve

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

overall situation configmap Trigger update

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: filebeat
  namespace: log 
  labels:
    k8s-app: filebeat
  annotations:
    reloader.stakater.com/auto: "true"

As specified configmap Changes automatically trigger configuration updates for resource objects

• single ConfigMap to update

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: filebeat
  namespace: log 
  labels:
    k8s-app: filebeat
  annotations:
    configmap.reloader.stakater.com/reload: "filebeat-config"

• many configmap, Multiple... With commas configmap In isolation

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: filebeat
  namespace: log 
  labels:
    k8s-app: filebeat
  annotations:
    configmap.reloader.stakater.com/reload: "filebeat-config,foo-config"