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)

Understanding Ceph service management

Every component of Ceph, whether it's MON, OSD, MDS, or RGW, runs as a service on top of an underlying operating system. As a Ceph storage administrator, you should know about the Ceph services and how to operate them. As per Red Hat based distributions, Ceph daemons are managed as a traditional systemd manager service. Each time you start, restart, and stop Ceph daemons (or your entire cluster), you must specify at least one option and one command. You may also specify a daemon type or a daemon instance. The general syntax for this is as follows:

systemctl [options...] command [service name...]

The systemctl options include:

  • --help or -h: Prints a short help text
  • --all or -a: When listing units, show all loaded units, regardless of their state
  • --signal or -s: When used will kill, choose which signal to send to the selected process
  • ...