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

Managing the cluster configuration file


If you are managing a large cluster, it's good practice to keep your cluster configuration file (/etc/ceph/ceph.conf) updated with information about cluster MONs, OSDs, MDSs, and RGW nodes. With these entries in place, you can manage all your cluster services from a single node.

How to do it...

ceph-ansible manages all aspects of the ceph configuration file that we will be using to update our cluster configuration. In order to achieve this, we will be updating the Ceph configuration file using the ceph_conf_overrides section of the /etc/ansible/group_vars/all.yml file and will be adding the details of all MON, OSD, and MDS nodes. Ansible supports the same sections as the Ceph configuration file: [global], [mon], [osd], [mds], [rgw], and so on.

Adding monitor nodes to the Ceph configuration file

Since we have three monitor nodes, add their details to the ceph_conf_overrides section of the all.yml file:

  1. In ceph-node1 in the /usr/share/ceph-ansible/group_vars...