Book Image

Ceph: Designing and Implementing Scalable Storage Systems

By : Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk, Anthony D'Atri, Vaibhav Bhembre
Book Image

Ceph: Designing and Implementing Scalable Storage Systems

By: Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk, Anthony D'Atri, Vaibhav Bhembre

Overview of this book

This Learning Path takes you through the basics of Ceph all the way to gaining in-depth understanding of its advanced features. You’ll gather skills to plan, deploy, and manage your Ceph cluster. After an introduction to the Ceph architecture and its core projects, you’ll be able to set up a Ceph cluster and learn how to monitor its health, improve its performance, and troubleshoot any issues. By following the step-by-step approach of this Learning Path, you’ll learn how Ceph integrates with OpenStack, Glance, Manila, Swift, and Cinder. With knowledge of federated architecture and CephFS, you’ll use Calamari and VSM to monitor the Ceph environment. In the upcoming chapters, you’ll study the key areas of Ceph, including BlueStore, erasure coding, and cache tiering. More specifically, you’ll discover what they can do for your storage system. In the concluding chapters, you will develop applications that use Librados and distributed computations with shared object classes, and see how Ceph and its supporting infrastructure can be optimized. By the end of this Learning Path, you'll have the practical knowledge of operating Ceph in a production environment. This Learning Path includes content from the following Packt products: • Ceph Cookbook by Michael Hackett, Vikhyat Umrao and Karan Singh • Mastering Ceph by Nick Fisk • Learning Ceph, Second Edition by Anthony D'Atri, Vaibhav Bhembre and Karan Singh
Table of Contents (27 chapters)
Title Page
About Packt
Contributors
Preface
Index

Configuring two-way mirroring


Two-way mirroring requires a rbd-mirror daemon running on both clusters, the primary and the secondary. With two way mirroring it is possible to mirror data or images from the primary site to a secondary site, and the secondary site can mirror data or images back to the primary site. 

We will not be demoing this configuration in this book at it is very similar to the one-way configuration, but we will highlight the changes needed for two way replication at the pool level, these steps are covered in the one-way replication recipe.

How to do it...

  1. Both clients must have the rbd-mirror installed and running:
        # yum install rbd-mirror
        # systemctl enable ceph-rbd-mirror.target
        # systemctl enable ceph-rbd-mirror@<client-id>
        # systemctl start ceph-rbd-mirror@<client-id>
  1. As with one way mirroring, both clients must have copies of the respective cluster configuration files and keyrings for client users for the mirrored pools.
  2. The...