K8s 服务作为 DaemonSet

Question

Is there a possibility to have a service in all namespaces of k8s dynamically deployed?

Right now, glusterFS endpoint(ns dependent) is being deleted by k8s if the port is not in use anymore. Ex:

{
  "kind": "Endpoints",
  "apiVersion": "v1",
  "metadata": {
    "name": "glusterfs"
  },
  "subsets": [
    {
      "addresses": [
        {
          "ip": "172.0.0.1"
        }
      ],
      "ports": [
        {
          "port": 1
        }
      ]
    }
  ]
}

So I made a svc for port 1 to be used all the time, so I dont end up with a missing/deleted endpoint in any ns.

apiVersion: v1
kind: Service
metadata:
  name: glusterfs
spec:
  ports:
  - port: 1

It would be interesting to have the above service deployed dynamically every time someone creates a new namespace.

Answer 1

DaemonSet is used to deploy Exactly one replica per node.

coming to your question, why do you need to create same service across namespaces? It is not supported out of box though. However, you can create a custom script to achieve it.

Answer 2

K8s doesn't have any replication of services, pods, deployments, secrets, etc across namespaces... out of the box.

Introducing...The Kubernetes Controller/Operator Pattern.

Deploy a controller pod that has a read/list permissions on the namespaces resource. This controller will "watch" the namespaces and deploy whatever resources you want when they show up or change.

To get started building your own operator or controller please look at kubebuilder. https://book.kubebuilder.io/