HorizontalPodAutoscaler overwrites volume when releasing a Pod-CodePudding

i have a question to ask you about kubernates. I need to configure a Horizontal Load Balancer on a service with Kubernates. Specifically in my yaml file I used the following kind: HorizontalPodAutoscaler; the problem arises on the logic of uploading files to the volume: in a nutshell, when a pod is released, the data inside is overwritten, so with a new pod the volume is emptied. Am I wrong in configurations? Specifically, I set the volume in the Dockerfile to build the corresponding image of the service launched with Kubernates.

CodePudding user response：

it's not good idea to store data in Dockerimage however still what you can do is,

Copy data to docker image
Inside the Kubernetes POD create the PVC volume
Attach POD to PVC and use the volume mount
Use the init container to copy data from the docker path to the volume mount file path

Dockerfile

FROM python:latest
COPY data.csv ./tmp/

Kubernetes YAML

apiVersion: apps/v1
kind: Deployment
metadata:
  name: POD-name
spec:
  replicas: 2
  selector:
    matchLabels:
      app: test
  template:
    metadata:
      labels:
        app: test
    spec:
      initContainers:
      - name: copy
        image: busybox:1.28
        command: ["/bin/sh", "-c", "cp /tmp/data.csv /data/data.csv"]
        volumeMounts:
        - name: pvc
          mountPath: /data/
      containers:
      - name: test
        image: image:tag
        ports:
        - containerPort: 8080
        env:
        - name: PORT
          value: "8080"
        volumeMounts:
        - mountPath: "/data/"
          name: pvc
      volumes:
      - name: pvc
        persistentVolumeClaim:
          claimName: pvc-claim