Book Image

Ceph Cookbook - Second Edition

By : Karan Singh, Hackett, Umrao
Book Image

Ceph Cookbook - Second Edition

By: Karan Singh, Hackett, Umrao

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 monitors

Ceph monitor issues can usually be seen in the ceph status or ceph health detail command outputs, and they identify which monitor is reporting the issue. Ceph monitor logs are located at /var/log/ceph/ceph-mon.<node-name>.log, and this log can be investigated to determine the root cause of monitor failures or errors. The upcoming recipes will cover some common issues that can be seen in your Ceph cluster with monitors.

How to do it...

Let's take a look at some of the most common monitor errors and some steps on how to resolve these issues:

  1. Ceph monitor is reporting a clock skew:
    • Clock skew can be reported in the monitor log file as well as in the ceph status command.
    • This error indicates...