Is possible to connect a DO K8s cluster with a DO Droplet private network?

Works for me!

Your database server must be in same region (eg. NYC1) as your kubernetes cluster.

Make sure your database server only listening to the private IP address of your droplet (not public IP).

---
kind: Service
apiVersion: v1
metadata:
  name: mysql
spec:
  ports:
    - name: mysql
      port: 3306
      targetPort: 3306

---
kind: Endpoints
apiVersion: v1
metadata:
  name: mysql
subsets:
  - addresses:
      - ip: PRIVATE.IP.OF.DATABASE.DROPLET
    ports:
      - name: mysql
        port: 3306

I just made this this weekend. We don’t need any extra stuff here, for connecting pods to a droplet database.

Ensure the k8s cluster is in the same region of the droplets you want to connect.

Ensure that the firewall of the DB droplet is well configured.

The issue i was having was because, the pool of nodes for k8s cluster was not having the tag it should have to pass the firewall.

Once i added the tag to the pool, all nodes of that pool inherit the tag, and the private connections started to work.

DO support replied me:

Kubernetes clusters use their own overlay network so it wouldn’t be possible to connect other Droplets to the cluster; you would have to expose a service on the cluster, through a Load Balancer typically, to be able to access the service from outside the cluster.

So I think that answers the question.