Book Image

Ceph: Designing and Implementing Scalable Storage Systems

By : Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk, Anthony D'Atri, Vaibhav Bhembre
Book Image

Ceph: Designing and Implementing Scalable Storage Systems

By: Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk, Anthony D'Atri, Vaibhav Bhembre

Overview of this book

This Learning Path takes you through the basics of Ceph all the way to gaining in-depth understanding of its advanced features. You’ll gather skills to plan, deploy, and manage your Ceph cluster. After an introduction to the Ceph architecture and its core projects, you’ll be able to set up a Ceph cluster and learn how to monitor its health, improve its performance, and troubleshoot any issues. By following the step-by-step approach of this Learning Path, you’ll learn how Ceph integrates with OpenStack, Glance, Manila, Swift, and Cinder. With knowledge of federated architecture and CephFS, you’ll use Calamari and VSM to monitor the Ceph environment. In the upcoming chapters, you’ll study the key areas of Ceph, including BlueStore, erasure coding, and cache tiering. More specifically, you’ll discover what they can do for your storage system. In the concluding chapters, you will develop applications that use Librados and distributed computations with shared object classes, and see how Ceph and its supporting infrastructure can be optimized. By the end of this Learning Path, you'll have the practical knowledge of operating Ceph in a production environment. This Learning Path includes content from the following Packt products: • Ceph Cookbook by Michael Hackett, Vikhyat Umrao and Karan Singh • Mastering Ceph by Nick Fisk • Learning Ceph, Second Edition by Anthony D'Atri, Vaibhav Bhembre and Karan Singh
Table of Contents (27 chapters)
Title Page
About Packt
Contributors
Preface
Index

Running Ceph with systemd


Ceph process management is done through the systemd service. Systemd is a replacement for the UNIX System V systems (SYSVINIT). The general syntax for managing Ceph daemons using systemd is systemctl [options] {command} {service/target}.

How to do it...

Let's have a detailed look at managing Ceph daemons using systemd:

Starting and stopping all daemons

To start or stop all Ceph daemons, perform the following set of commands.

Let's see how to start and stop all Ceph daemons:

  1. To start all Ceph services on a particular node, execute the systemd manager for the Ceph unit with the start command. This command will start all Ceph services that you have deployed for this node:
# systemctl start ceph.target
  1. To stop all Ceph services on one particular node, execute the systemd manager for the Ceph unit using the stop command. This command will stop all Ceph services that you have deployed for this node:
# systemctl stop ceph\*.service ceph\*.target
  1. To start/stop all Ceph services on...