Node modules empty in kubernetes

Question

I used to create volume in docker-compose in the following manner:

volumes:
  - ./server:/home/app
  - /home/app/node_modules

I want to do the same on kubernetes

I've created the following config

  spec:
    containers:
    - env: []
      image: "image"
      volumeMounts:
      - mountPath: /home/app
        name: vol-app
      - mountPath: /home/app/node_modules
        name: vol-node-modules
      name: demo
    volumes:
    - name: vol-app
      hostPath:
        path: /Users/me/server
    - name: vol-node-modules
      emptyDir: {}

but it doesn't work. the node_modules is empty

Answer 1

The general idea is that init containers allow you to copy the node_modules directory from your image into an empty volume, then mount that volume in your application's pod.

kind: Deployment
apiVersion: apps/v1
metadata:
  ...
spec:
  ...
  template:
    ...
    spec:
      initContainers:
        - name: frontend-clone
          image: YOUR_REGISTRY/YOUR_IMAGE
          command:
            - cp
            - -a
            - /app/node_modules/.
            - /node_modules/
          volumeMounts:
            - name: node-modules-volume
              mountPath: /node_modules
      containers:
        - name: frontend
          image: YOUR_REGISTRY/YOUR_IMAGE
          volumeMounts:
            - name: source-volume
              mountPath: /app
            - name: node-modules-volume
              mountPath: /app/node_modules
      volumes:
        - name: source-volume
          hostPath:
            path: /YOUR_HOST_CODE_DIRECTORY/frontend
        - name: node-modules-volume
          emptyDir: {}