CODEWITHSUNDEEP
kubernetes
Mar Teen
Mar Teen

Reputation: 117

Different configuration for each kubernetes pod

I have Kubernetes Deployment with 10 pods.

And I have 10 directories path in my database table (path_table) as follow:

path,id
c:\dir1, 1
c:\dir2, 2
...
c:\dir10, 10

I want to configure each pod to look on different path from DB. Means - pod1 will monitor c:\dir1, pod2 will monitor c:\dir2,etc..

How can I make each pod start with different query from db to take it's path, example:

pod1 start with select path from path_table where id=1

pod2 start with select path from path_table where id=2

...

Upvotes: 1

Views: 3010

Answers (1)

Krishna Chaurasia
Krishna Chaurasia

Reputation: 9590

As mentioned in the comments, I don't think it is possible with Deployment as the pods in a Deployment are independent replicas of the same application with no state.

You might want to look at StatefulSets where each pod has a unique name that can be used to work on a specific directory as you require.

You can pass the pod name as the environment variable to the pods which has a unique id in case of Statefulset:

env:
      - name: MY_POD_NAME
        valueFrom:
          fieldRef:
            fieldPath: metadata.name

So, if you have ten replicas of a Statefulset with name myapp then the pods will have the names as myapp-0, myapp-1 and so on.

You can then internally use these names to work on specific directories based on the env value of MY_POD_NAME.

Upvotes: 2

Related Questions