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

Monitoring Ceph clusters


In this recipe, we will learn commands that are used to monitor the overall Ceph cluster.

How to do it…

Here is how we go about monitoring the Ceph cluster. The steps are explained topic-wise as follows.

Checking the cluster's health

To check the health of your cluster, use the ceph command followed by health as the command option:

# ceph health

The output of this command would be divided into several sections separated by a semicolon:

The first section of the output shows that your cluster is in the warning state, HEALTH_WARN, as 64 placement groups (PGs) are degraded. The second section represents that 1408 PGs are not clean, and the third section of the output represents that cluster recovery is going on for 1 out of 5744 objects and the cluster is 0.017% degraded. If your cluster is healthy, you will receive the output as HEALTH_OK.

To find out more details of your cluster health, use the ceph health detail command. This command will tell you all the PGs that are...