Book Image

Ceph Cookbook - Second Edition

By : Vikhyat Umrao, Karan Singh, Michael Hackett
Book Image

Ceph Cookbook - Second Edition

By: Vikhyat Umrao, Karan Singh, Michael Hackett

Overview of this book

Ceph is a unified distributed storage system designed for reliability and scalability. This technology has been transforming the software-defined storage industry and is evolving rapidly as a leader with its wide range of support for popular cloud platforms such as OpenStack, and CloudStack, and also for virtualized platforms. Ceph is backed by Red Hat and has been developed by community of developers which has gained immense traction in recent years. This book will guide you right from the basics of Ceph , such as creating blocks, object storage, and filesystem access, to advanced concepts such as cloud integration solutions. The book will also cover practical and easy to implement recipes on CephFS, RGW, and RBD with respect to the major stable release of Ceph Jewel. Towards the end of the book, recipes based on troubleshooting and best practices will help you get to grips with managing Ceph storage in a production environment. By the end of this book, you will have practical, hands-on experience of using Ceph efficiently for your storage requirements.
Table of Contents (15 chapters)

Troubleshooting placement groups

As with the Ceph daemons issues, placement group issues will usually first be seen in the ceph health detail or status commands. They are usually accompanied by OSDs that are in a down state or a clock skew issue on the monitors. Prior to moving forward with troubleshooting, placement groups validate that all of your Ceph monitors are up and in quorum and that all Ceph OSDs are in the up/in state. The upcoming recipes will show you how to troubleshoot some of the more common Ceph placement group issues you may come across in your Ceph cluster.

How to do it...

Before you begin troubleshooting PG states, validate that the Ceph monitors are all up and in quorum and that any available OSDs are...