Specify Rook daemons placement

If you need to configure the placement of Rook daemons on nodes, you can set extra values to Pelagia Helm chart release.

The procedures in this section describe how to specify the placement of rook-ceph-operator, rook-discover, and Ceph CSI pods such as:

<rookNamespace>.cephfs.csi.ceph.com-ctrlplugin
<rookNamespace>.cephfs.csi.ceph.com-nodeplugin
<rookNamespace>.rbd.csi.ceph.com-ctrlplugin
<rookNamespace>.rbd.csi.ceph.com-nodeplugin

Where <rookNamespace> is the Rook namespace. For example, in the default rook-ceph namespace, the CephFS CSI controller plugin is named rook-ceph.cephfs.csi.ceph.com-ctrlplugin.

Specify rook-ceph-operator placement

Use the following Pelagia Helm chart values to specify rook-ceph-operator placement:

rook.rookConfig.rookOperatorPlacement.affinity is a key-value mapping that contains a valid Kubernetes affinity specification.
rook.rookConfig.rookOperatorPlacement.nodeSelector is a key-value mapping that contains a valid Kubernetes nodeSelector specification.
rook.rookConfig.rookOperatorPlacement.tolerations is a list that contains valid Kubernetes toleration items.

Upgrade Pelagia Helm release with the desired placement values by setting them directly to release:

helm upgrade --install pelagia-ceph oci://registry.mirantis.com/pelagia/pelagia-ceph --version ${PELAGIA_VERSION} -n ceph-lcm-mirantis \
  --set rook.rookConfig.rookOperatorPlacement.affinity=<rookOperatorAffinity>,\
        rook.rookConfig.rookOperatorPlacement.nodeSelector=<rookOperatorNodeSelector>,\
        rook.rookConfig.rookOperatorPlacement.tolerations=<rookOperatorTolerations>

After upgrading Pelagia Helm release, wait for some time and verify that the changes have applied:

kubectl -n rook-ceph get deploy rook-ceph-operator -o yaml

Specify Ceph CSI pods placement

Use the following Pelagia Helm chart values to specify Ceph CSI pods placement:

rook.rookConfig.csiPlacement.nodeAffinity.csiprovisioner is a valid Kubernetes label selector expression for the CSI controller plugin deployments.
rook.rookConfig.csiPlacement.nodeAffinity.csiplugin is a valid Kubernetes label selector expression for the CSI node plugin DaemonSets. Default is ceph-daemonset-available-node=true.
rook.rookConfig.csiPlacement.tolerations.csiplugin is a string which contains a valid list of Kubernetes toleration items for the CSI node plugin DaemonSets. For example:
```
csiplugin: |
  - effect: NoSchedule
    key: node-role.kubernetes.io/controlplane
    operator: Exists
```
rook.rookConfig.csiPlacement.tolerations.csiprovisioner is a string which contains a valid list of Kubernetes toleration items for the CSI controller plugin deployments. For example:
```
csiprovisioner: |
  - effect: NoSchedule
    key: node-role.kubernetes.io/controlplane
    operator: Exists
```

Upgrade Pelagia Helm release with the desired placement values by setting them directly to release:

helm upgrade --install pelagia-ceph oci://registry.mirantis.com/pelagia/pelagia-ceph --version ${PELAGIA_VERSION} -n ceph-lcm-mirantis \
  --set rook.rookConfig.csiPlacement.nodeAffinity.csiprovisioner="<nodeAffinityLabelSelector>"

After upgrading Pelagia Helm release, wait for some time and verify that the changes have applied:

kubectl -n <rookNamespace> get ds <rookNamespace>.rbd.csi.ceph.com-nodeplugin -o yaml
kubectl -n <rookNamespace> get ds <rookNamespace>.cephfs.csi.ceph.com-nodeplugin -o yaml
kubectl -n <rookNamespace> get deploy <rookNamespace>.rbd.csi.ceph.com-ctrlplugin -o yaml
kubectl -n <rookNamespace> get deploy <rookNamespace>.cephfs.csi.ceph.com-ctrlplugin -o yaml

Specify rook-discover placement

Use the following Pelagia Helm chart values to specify rook-discover placement:

rook.rookConfig.rookDiscoverPlacement.nodeAffinity is a valid Kubernetes label selector expression. Default is ceph-daemonset-available-node=true;ceph_role_osd=true.
rook.rookConfig.rookDiscoverPlacement.tolerations is a string which contains a valid list of Kubernetes toleration items. For example:
```
tolerations: |
  - effect: NoSchedule
    key: node-role.kubernetes.io/controlplane
    operator: Exists
```

Upgrade Pelagia Helm release with the desired placement values by setting them directly to release:

helm upgrade --install pelagia-ceph oci://registry.mirantis.com/pelagia/pelagia-ceph --version ${PELAGIA_VERSION} -n ceph-lcm-mirantis \
  --set rook.rookConfig.rookDiscoverPlacement.nodeAffinity="<nodeAffinityLabelSelector>"

After upgrading Pelagia Helm release, wait for some time and verify that the changes have applied:

kubectl -n rook-ceph get ds rook-discover -o yaml