Book Image

Ceph Cookbook

Book Image

Ceph Cookbook

Overview of this book

Ceph is a unified, distributed storage system designed for excellent performance, reliability, and scalability. This cutting-edge technology has been transforming the storage industry, and is evolving rapidly as a leader in software-defined storage space, extending full support to cloud platforms such as Openstack and Cloudstack, including virtualization platforms. It is the most popular storage backend for Openstack, public, and private clouds, so is the first choice for a storage solution. Ceph is backed by RedHat and is developed by a thriving open source community of individual developers as well as several companies across the globe. This book takes you from a basic knowledge of Ceph to an expert understanding of the most advanced features, walking you through building up a production-grade Ceph storage cluster and helping you develop all the skills you need to plan, deploy, and effectively manage your Ceph cluster. Beginning with the basics, you’ll create a Ceph cluster, followed by block, object, and file storage provisioning. Next, you’ll get a step-by-step tutorial on integrating it with OpenStack and building a Dropbox-like object storage solution. We’ll also take a look at federated architecture and CephFS, and you’ll dive into Calamari and VSM for monitoring the Ceph environment. You’ll develop expert knowledge on troubleshooting and benchmarking your Ceph storage cluster. Finally, you’ll get to grips with the best practices to operate Ceph in a production environment.
Table of Contents (18 chapters)
Ceph Cookbook
Credits
Foreword
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Maintaining a Ceph cluster


Being a Ceph storage admin, maintaining your Ceph cluster would be one of your top priorities. Ceph is a distributed system that is designed to grow from tens of OSDs to several thousands of them. One of the key things required to maintain a Ceph cluster is to manage its OSDs. In this recipe, we will cover Ceph sub commands for OSDs and PGs that will help you during cluster maintenance and troubleshooting.

How to do it…

To understand the need for these commands better, let's assume a scenario where you want to add a new node to your production Ceph cluster. One way is to simply add the new node with several disks to the Ceph cluster, and the cluster will start backfilling and shuffling the data on to the new node. This is fine for a test cluster.

However, the situation becomes very critical when it comes to the production setup, where you should use some of the ceph osd sub commands/flags, which are mentioned as follows, before adding a new node to the cluster, such...