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)

Disaster recovery replication using RBD mirroring

RBD mirroring is an asynchronous replication of RBD images between multiple Ceph clusters. RBD mirroring validates a point-in-time consistent replica of any change to an RBD image, including snapshots, clones, read and write IOPS and block device resizing. RBD mirroring can run in an active+active setup or an active+passive setup. RBD mirroring utilizes the RBD journaling and exclusive lock features which enables the RBD image to record all changes to the image in order of which they occur. These features validate that a crash-consistent copy of the remote image is available locally. Before mirroring can be enabled on a Ceph cluster the journaling feature must be enabled on the RBD image.

The daemon responsible for ensuring point-in-time consistency from one Ceph cluster to the other is the rbd-mirror daemon. Depending on your...