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Learning Ceph

You're reading from Learning Ceph Unifed, scalable, and reliable open source storage solution

Product type Paperback

Published in Oct 2017

Publisher

ISBN-13 9781787127913

Length 340 pages

Edition 2nd Edition

Languages

C++

Tools

Ceph

Concepts

Distributed Computing

Authors (4):

Karan Singh

Bryan Stillwell

Anthony D'Atri

Vaibhav Bhembre

View More author details

Table of Contents (12) Chapters

Preface

1. Introducing Ceph Storage FREE CHAPTER

2. Ceph Components and Services

3. Hardware and Network Selection

4. Planning Your Deployment

5. Deploying a Virtual Sandbox Cluster

6. Operations and Maintenance

7. Monitoring Ceph

8. Ceph Architecture: Under the Hood

9. Storage Provisioning with Ceph

10. Integrating Ceph with OpenStack

11. Performance and Stability Tuning

Monitoring Ceph MONs

A proper Ceph cluster comprises three or more Monitor daemons, ideally situated on distinct physical servers. As discussed in Chapter 4, Planning your Deployment, multiple MONs are recommended to ensure fault tolerance and maintainability. If a cluster's MONs cannot form a quorum, which happens if not enough of the provisioned MONs are up, then new clients won't be able to connect to the system. Worse yet, existing clients will no longer be able to perform operations once their sessions expire. It is paramount for cluster health to have a majority of MONs up and able to fulfill their quorum duties.

MON status

We can retrieve basic information about all MONs in the cluster by running the ceph utility's mon stat subcommand. If our clusters contains MONs that are down or unavailable and thus have been temporarily kicked out of quorum, this command will alert us to the situation so that we can address it.

root@ceph-client0:~# ceph mon stat
e1: 1 mons at {ceph-mon0=192.168.42...

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Authors (4)

D'Atri

D'Atri

Anthony D'Atri's career in system administration spans from laptops to vector supercomputers. He has brought his passion for fleet management and server components to bear on a holistic yet, detailed approach to deployment and operations. His experience with architecture, operation, and troubleshooting of NetApp, ZFS, SVM, and other storage systems dovetailed neatly into Ceph. Anthony worked for three years at Cisco using Ceph as a petabyte-scale object and block backend to multiple OpenStack clouds. Now helping deliver awesome storage to droplet customers of DigitalOcean, Anthony aims to help the growing community build success with Ceph.

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Bhembre

Bhembre

Vaibhav Bhembre is a systems programmer working currently as a technical lead for cloud storage products at DigitalOcean. He holds a bachelor's degree in computer engineering from the University of Mumbai and a master's degree in computer science from the State University of New York in Buffalo. Before joining DigitalOcean, Vaibhav wore multiple hats and lead the backend engineering and reliability engineering teams at Sailthru Inc. From helping to scale dynamically generated campaign sends to over million users at a time, to architecting a cloud-scale compute and storage platform, Vaibhav has years of experience writing software across all layers of the stack. During his time as a student, Vaibhav co-published a novel graph algorithm that optimally computed closeness and betweenness in an incrementally updating social network. He also made changes to a highly available distributed file-system built on top of iRODs data management framework as his master's project. This system, that was actively used across more than 10+ educational institutions live, was his foray into large-scale distributed storage and his transition into using Ceph professionally was only natural.

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Bryan Stillwell

Bryan Stillwell

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Karan Singh

Karan Singh

Karan is an IT expert and passionate tech enthusiast living with his beautiful wife Monika in Finland. He holds Honours degree in Bachelor of Computer Science and a Master degree in System Engineering from BITS, Pilani. Apart from this, he is a certified professional for technologies like OpenStack, NetApp and Oracle Solaris. Karan is currently working as a System Specialist of Storage and Cloud Platform for CSC - IT Center for Science Ltd. focusing all his energies on providing IaaS cloud solutions based on OpenStack and Ceph and building economic multi-petabyte storage system using Ceph. Karan possesses a rich skill set and working experience of a variety of cloud technologies. He devotes a part of his time to R&D and learning technologies. He is also the author of the very first book on Ceph titled Learning Ceph, published in 2014. Karan possesses extensive system administration skills and has excellent working experience on a variety of Unix environments, backup, enterprise storage systems, and cloud platforms. When not working on Ceph and OpenStack, Karan can be found working with Configuration management, containers and devops related tools. He loves writing about technologies and is an avid blogger. You can reach him on Twitter.

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