Integrate Pelagia with Rockoon

This document describes how to integrate Pelagia with the Rockoon OpenStack Controller. As Ceph supports integration with OpenStack, Pelagia provides a way to integrate Rook Ceph cluster with Rockoon OpenStack inside the Kubernetes cluster.

How to integrate Pelagia with Rockoon

In the CephDeployment custom resource, create the following Ceph pools required for Rockoon OpenStack and ensure that the role parameter is explicitly set:

volumes for the OpenStack Block Storage service (cinder)
backup for the OpenStack Block Storage service (cinder)
vms for the OpenStack Compute service (nova)

images for the OpenStack Image service (glance)

For example:

spec:
  blockStorage:
    pools:
    ...
    - name: volumes
      role: volumes
      spec:
        deviceClass: hdd
        replicated:
          size: 3
    - name: backup
      role: backup
      spec:
        deviceClass: hdd
        replicated:
          size: 3
    - name: vms
      role: vms
      spec:
        deviceClass: hdd
        replicated:
          size: 3
    - name: images
      role: images
      spec:
        deviceClass: hdd
        replicated:
          size: 3

As a result, Pelagia creates the following Ceph pools: volumes-hdd, backup-hdd, vms-hdd, and images-hdd. We recommend the following target ratios for these pools to match the default OpenStack requirements:

Volumes pool: 0.4
Backup pool: 0.1
VMs pool: 0.2
Images pool: 0.1

We recommend adjusting these ratios according to your OpenStack deployment requirements using the parameters.target_size_ratio parameter located in the pools section. For reference, see Rook documentation: CephBlockPool CRD Spec. For details on how to set correct values, see Calculate target ratios for Ceph pools for Rockoon.

After Ceph pools are created, Pelagia Deployment Controller creates a secret in the openstack-ceph-shared namespace with all necessary information for Rockoon OpenStack services to be configured with the Ceph cluster. Rockoon Controller watches this namespace and transforms the secret into the data structures expected by OpenStack Helm charts. After that, OpenStack services will be connected to the desired Ceph cluster.

If CephDeployment contains the objectStorage section and Ceph Object Storage is deployed, then Pelagia and Rockoon enable Ceph RADOS Gateway integration with OpenStack Object Storage service (swift).