Connect external storage cluster to NSP

Purpose

Perform this procedure to connect an external storage cluster to NSP.

In this procedure, the following terms are used:

  • External storage cluster—Ceph configured that is managed outside an NSP cluster.

  • Source cluster—Ceph cluster that is providing data to the NSP cluster in the external configuration. This is the external source cluster.

  • Consumer cluster—NSP Kubernetes cluster that is consuming data from the external source cluster in the external configuration

The examples in the following procedure include sample names.

Steps
 
1 

Log in as the root user on the NSP cluster host.

2 

Open a console window.

On the source cluster
 
3 

Ensure the volumes are attached to the source cluster.

4 

Deploy the Rook operator and Ceph source cluster; see https://rook.io/docs/rook/latest/Getting-Started/quickstart/ for detailed procedures.

5 

Execute the commands in "Commands on the source Ceph cluster" section of the following document:

https://www.rook.io/docs/rook/v1.12/CRDs/Cluster/external-cluster/

Note: Set the hostNetwork: true line in the network section of rook-ceph-cluster values.yaml to configure the Ceph pods to use the host network namespace instead of creating their own isolated network.

# Network configuration, see: https://github.com/rook/rook/blob/master/Documentation/CRDs/Cluster/ceph-cluster-crd.md#network-configuration-settings network:

  hostNetwork: true

On the consumer cluster
 
6 

Execute the commands in "Commands on the source Ceph cluster" section of the following document:

https://www.rook.io/docs/rook/v1.12/CRDs/Cluster/external-cluster/

7 

Configure storage classes from Step 6 in nsp-config.yaml file before installing NSP:

  1. Open the following file using a plain-text editor such as vi:

    /opt/nsp/NSP-CN-DEP-old-release-ID/NSP-CN-old-release-ID/config/nsp-config.yml

  2. Edit the following line in the platform section, kubernetes subsection to read:

    kubernetes:

      storage:

        readWriteOnceLowIOPSClass: "ceph-rbd"

        readWriteOnceHighIOPSClass: "ceph-rbd"

        readWriteOnceClassForDatabases: "ceph-rbd"

        readWriteManyLowIOPSClass: "cephfs"

        readWriteManyHighIOPSClass: "cephfs"

    where

    ceph-rbd is the storage class created in Step 6

    cephfs is the storage class created in Step 6

  3. Save and close the file.

8 

Check PVC and PV creation using storage classes in Step 7:

# cat fs_pvc.yaml

kind: PersistentVolumeClaim

apiVersion: v1

metadata:

  name: test-rwx-cephfs-pvc

spec:

  accessModes:

    - ReadWriteMany

  storageClassName: cephfs

  resources:

    requests:

      storage: 10Gi

# kubectl create -f fs_pvc.yaml

persistentvolumeclaim/test-rwx-cephfs-pvc created

# kubectl get pvc -A

NAMESPACE   NAME   STATUS   VOLUME      CAPACITY   ACCESS MODES   STORAGECLASS   AGE

default     name   Bound    volume_id   size       RWX            cephfs         4s

End of steps