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:
  pools:
  ...
  - default: false
    deviceClass: hdd
    name: volumes
    replicated:
      size: 3
    role: volumes
  - default: false
    deviceClass: hdd
    name: backup
    replicated:
      size: 3
    role: backup
  - default: false
    deviceClass: hdd
    name: vms
    replicated:
      size: 3
    role: vms
  - default: false
    deviceClass: hdd
    name: images
    replicated:
      size: 3
    role: images

As a result, Pelagia creates the following Ceph pools: volumes-hdd, backup-hdd, vms-hdd, and images-hdd. Target ratios will be automatically configured 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

Mirantis recommends adjusting these ratios according to your OpenStack deployment requirements using the parameters.target_size_ratio parameter located in the pools section.

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).