How to share and keep synced code inside /app/public between php fpm and nginx container in k8s ?

[kconde2]

I made this deployment.
I created a k8s cluster with one node locally on my computer.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: backend
  labels:
    app: backend
spec:
  revisionHistoryLimit: 2
  selector:
    matchLabels:
      app: backend
  template:
    metadata:
      labels:
        app: backend
    spec:
      containers:
        - name: backend-nginx
          image: my-backend_nginx
          imagePullPolicy: Always
          ports:
            - name: nginx
              containerPort: 8080
          env:
            - name: PHP_FPM_HOST
              value: 127.0.0.1
        - name: backend-php-fpm
          image: my-backend_php-fpm
          imagePullPolicy: Always
          ports:
            - name: php-fpm
              containerPort: 9000
          envFrom:
            - configMapRef:
                name: backend-configmap

When user upload files, they are stored into /app/public/media (not empty) under php-fpm container
My problem is that those files are not replicated inside nginx container under same path /app/public/media (empty).

Thanks in advance.

[sherifabdlnaby]

@kconde2 In Kubernetes, most of the time your code needs to be stateless. So you're not expected to serve user-uploaded media from the webserver/pod that you uploaded it to. Instead use some block store like S3, etc.

If you're dealing with a legacy application that you can't control, then you'll need to mount a volume at /app/public/media in both the Web & App container. If you want your application to horizontally scale and have replicas > 1, then this volume needs to be a ReadWriteMany volume, like AWS' EFS K8S Volumes using aws efs csi driver.

If you don't care if these media are lost at the even of Pod Restart, you can then use an EmptyDir volume in K8S.

[kconde2]

I decided to use minio. Thanks for you explanations.