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

Upgrading your Ceph cluster


One of the several reasons for the greatness of Ceph is that almost all the operations on a Ceph cluster can be performed online, which means that your Ceph cluster is in production and serving clients, and you can perform administrative tasks on the cluster without downtime. One of these operations is upgrading the Ceph cluster version.

Since the first chapter, we have been using the Jewel release of Ceph. We will be demonstrating upgrading the Ceph cluster version from Jewel to Kraken using the Ansible rolling_update.yml playbook located in the /usr/share/ceph-ansible/infrastructure-playbooks directory. The rolling_update.yml playbook fully automates the Ceph cluster upgrade process.

Ansible upgrades the Ceph nodes in the following order, one at a time:

  • Monitor nodes
  • OSD nodes
  • MDS nodes
  • Ceph RadosGW nodes
  • All other Ceph client nodes

During the upgrade, Ansible will also set the noout, noscrub, and nodeep-scrub flags on the cluster to prevent any unnecessary data movement...