How to use storage at Master Node?

[Engin Güngör]

Hello, I have a cluster which is contains 3 master and 3 worker node. I want to create my OSD  from my master node volume. Is it possible with rock?

I have already tried with nodeSelector part in cluster.yaml file but it didn't work.

Thanks.

[Alexander Trost]

If you want to add your Kubernetes master node(s) to as eligible nodes for your Rook Ceph Cluster, you need to add the tolerations to the sections of your CephCluster CR that you want to run on the master node(s).

Basic toleration example which might work depending on your K8S master nodes setup:

```
tolerations:
      - key: node-role.kubernetes.io/master
        operator: Exists
        effect: NoSchedule
```

If you want to consume Rook Ceph storage, you need to add tolerations to the Ceph CSI DaemonSets using the environment variables on the Rook Ceph operator, see https://github.com/rook/rook/blob/master/cluster/examples/kubernetes/ceph/operator.yaml#L108-L116

The Rook Ceph operator.yaml env var I linked to is also serving as an example for how the toleration might look like for allowing Pods / components to run on the K8S master nodes, https://github.com/rook/rook/blob/master/cluster/examples/kubernetes/ceph/operator.yaml#L108-L116

Rook Ceph Cluster CR docs: https://rook.io/docs/rook/v1.5/ceph-cluster-crd.html#placement-configuration-settings

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