Book Image

Mastering Ceph

By : Nick Fisk
Book Image

Mastering Ceph

By: Nick Fisk

Overview of this book

Mastering Ceph covers all that you need to know to use Ceph effectively. Starting with design goals and planning steps that should be undertaken to ensure successful deployments, you will be guided through to setting up and deploying the Ceph cluster, with the help of orchestration tools. Key areas of Ceph including Bluestore, Erasure coding and cache tiering will be covered with help of examples. Development of applications which use Librados and Distributed computations with shared object classes are also covered. A section on tuning will take you through the process of optimisizing both Ceph and its supporting infrastructure. Finally, you will learn to troubleshoot issues and handle various scenarios where Ceph is likely not to recover on its own. By the end of the book, you will be able to successfully deploy and operate a resilient high performance Ceph cluster.

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Table of Contents (12 chapters)
Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
Planning for Ceph
Planning for Ceph
What is Ceph?
How Ceph works?
Ceph use cases
Specific use cases
Infrastructure design
Network design
How to plan a successful Ceph implementation
Summary
2
Deploying Ceph
Deploying Ceph
Preparing your environment with Vagrant and VirtualBox
Orchestration
Ansible
A very simple playbook
Adding the Ceph Ansible modules
Change and configuration management
Summary
3
BlueStore
BlueStore
What is BlueStore?
Why was it needed?
How BlueStore works
How to use BlueStore
Summary
4
Erasure Coding for Better Storage Efficiency
Erasure Coding for Better Storage Efficiency
What is erasurecoding?
How does erasure coding work in Ceph?
Algorithms and profiles
Where can I use erasure coding?
Creating an erasure-coded pool
Summary
5
Developing with Librados
Developing with Librados
What is librados?
How to use librados?
Example librados application
Summary
6
Distributed Computation with Ceph RADOS Classes
Distributed Computation with Ceph RADOS Classes
Example applications and the benefits of using RADOS classes
Writing a simple RADOS class in Lua
Writing a RADOS class that simulates distributed computing
RADOS class caveats
Summary
7
Monitoring Ceph
Monitoring Ceph
Why it is important to monitor Ceph
What should be monitored
PG states -the good, the bad, and the ugly
Monitoring Ceph with collectd
Summary
8
Tiering with Ceph
Tiering with Ceph
Tiering versus caching
What is a bloom filter
Tiering modes
Uses cases
Creating tiers in Ceph
Tuning tiering
Promotion throttling
Summary
9
Tuning Ceph
Tuning Ceph
Latency
Benchmarking
Recommended tunings
Summary
10
Troubleshooting
Troubleshooting
Repairing inconsistent objects
Full OSDs
Ceph logging
Slow performance
Extremely slow performance or no IO
Investigating PGs in a down state
Large monitor databases
Summary
11
Disaster Recovery
Disaster Recovery
What is a disaster?
Avoiding data loss
What can cause an outage or data loss?
RBD mirroring
RBD recovery
Lost objects and inactive PGs
Recovering from a complete monitor failure
Using the Cephs object store tool
Investigating asserts
Summary

BlueStore

In this chapter, you will learn about BlueStore, the new object store in Ceph designed to replace the existing filestore. Its increased performance and enhanced feature set are designed to allow Ceph to continue to grow and provide a resilient high-performance distributed storage system for the future.

You will learn the following topics:

  • What is BlueStore?
  • The limitations with filestore
  • What problems BlueStore overcomes
  • The components of BlueStore and how it works
  • How to deploy BlueStore OSDs
Previous Section
End of Section 1
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