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

Configuration


Ceph's behavior is highly configurable and tunable via settings, which allow us to control Ceph's behavior and performance. Ceph daemons and clients at startup read /etc/ceph/ceph.conf to load configuration settings and other cluster information for the cluster named ceph. There are hundreds of values that can be set, but fortunately, we mostly need to concern ourselves with only a much smaller subset.

Cluster naming and configuration

The startup configuration file defines values that Ceph components need to start up and find each other. Many Ceph admins think of the file as always being named /etc/ceph/ceph.conf, but other names are possible. The directory /etc/ceph is the default location, but the filename's base is actually the name of a given cluster, which itself defaults to Ceph. Many installations, especially those with a single cluster, leave this defaulted, but custom names are becoming increasingly popular.

Throughout this book, we write in terms of the default cluster...