How to bring a docker data container to Kubernetes?

Question

I have an application that relies on 4 docker data containers for the data it needs to run some tests. At the moment I have their docker-compose file and their images but I don't have access to the data containers Dockerfile or actual data.

How this application works in docker-compose is as below: The application is called rtsp_server and it loads different volumes from the data containers such as st-andries4(I just wrote one of them).

This is their docker-compose:

# The application
rtsp_server:
  image: rtsp_server_image
  volumes_from:
    - rtsp_data_st_andries4:ro
  ports:
    - "8554:8554"
  command: python ./rtsp-server.py /rtsp_data/st-andries-4 st_andries_4

# Data container
rtsp_data_st_andries4:
  image: st_andries_4:1
  volumes:
    - /rtsp_data/st-andries-4
  command: /bin/true
  mem_limit: 10000000000

I already brought the application, rtsp_server, to Kubernetes and it works fine but I need to also bring the data containers to k8s but I don't know how to do it.

Answer 1

You'll want to look through the Kubernetes Volume documentation to see what options are available.

In particular look into the PersistentVolumeClaim. This allows you to setup a shared data volume for your pods. Here's an example snippet from a k8s deployment YAML using a volume:

spec:
      containers:
      - image: **yourdbcontainer**
        name: mysql-db
        env:
        - name: example
          value: example_value
        ports:
        - containerPort: 3306
          name: mysql-db
        volumeMounts:
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: mysql-pv-claim