Storage

There are two things that are known to be difficult with Kubernetes.

There are multiple types of volumes and we'll get started with two of them.

Shared volume

emptyDir

apiVersion: apps/v1
kind: Deployment
metadata:
  name: images
spec:
  replicas: 1
  selector:
    matchLabels:
      app: images
  template:
    metadata:
      labels:
        app: images
    spec:
      volumes: # Define volume
        - name: shared-image
          emptyDir: {}
      containers:
        - name: image-finder
          image: jakousa/dwk-app3-image-finder:b7fc18de2376da80ff0cfc72cf581a9f94d10e64
          volumeMounts: # Mount volume
          - name: shared-image
            mountPath: /usr/src/app/files
        - name: image-response
          image: jakousa/dwk-app3-image-response:b7fc18de2376da80ff0cfc72cf581a9f94d10e64
          volumeMounts: # Mount volume
          - name: shared-image
            mountPath: /usr/src/app/files

Persistent Volumes

One volume mounted by one pod

ReadWriteOnce

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: images
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

deployment.yaml

# ...
    spec:
      volumes:
        - name: shared-image
          persistentVolumeClaim:
            claimName: images
      containers:
        - name: image-finder
          image: jakousa/dwk-app3-image-finder:b7fc18de2376da80ff0cfc72cf581a9f94d10e64
          volumeMounts:
          - name: shared-image
            mountPath: /usr/src/app/files
        - name: image-response
          image: jakousa/dwk-app3-image-response:b7fc18de2376da80ff0cfc72cf581a9f94d10e64
          volumeMounts:
          - name: shared-image
            mountPath: /usr/src/app/files

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2. Tools