Book Image

Ceph Cookbook

Book Image

Ceph Cookbook

Overview of this book

Ceph is a unified, distributed storage system designed for excellent performance, reliability, and scalability. This cutting-edge technology has been transforming the storage industry, and is evolving rapidly as a leader in software-defined storage space, extending full support to cloud platforms such as Openstack and Cloudstack, including virtualization platforms. It is the most popular storage backend for Openstack, public, and private clouds, so is the first choice for a storage solution. Ceph is backed by RedHat and is developed by a thriving open source community of individual developers as well as several companies across the globe. This book takes you from a basic knowledge of Ceph to an expert understanding of the most advanced features, walking you through building up a production-grade Ceph storage cluster and helping you develop all the skills you need to plan, deploy, and effectively manage your Ceph cluster. Beginning with the basics, you’ll create a Ceph cluster, followed by block, object, and file storage provisioning. Next, you’ll get a step-by-step tutorial on integrating it with OpenStack and building a Dropbox-like object storage solution. We’ll also take a look at federated architecture and CephFS, and you’ll dive into Calamari and VSM for monitoring the Ceph environment. You’ll develop expert knowledge on troubleshooting and benchmarking your Ceph storage cluster. Finally, you’ll get to grips with the best practices to operate Ceph in a production environment.
Table of Contents (18 chapters)
Ceph Cookbook
Credits
Foreword
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Configuring Nova to boot instances from Ceph RBD


In order to boot all OpenStack instances into Ceph, that is, for the boot-from-volume feature, we should configure an ephemeral backend for nova. To do this, edit /etc/nova/nova.conf on the OpenStack node and perform the following changes.

How to do it…

This recipe deals with configuring Nova to store entire virtual machines on the Ceph RBD:

  1. Navigate to the [libvirt] section and add the following:

    inject_partition=-2
    images_type=rbd
    images_rbd_pool=vms
    images_rbd_ceph_conf=/etc/ceph/ceph.conf
  2. Verify your changes:

    # cat /etc/nova/nova.conf|egrep "rbd|partition" | grep -v "#"
    
  3. Restart the OpenStack nova services:

    # service openstack-nova-compute restart
    
  4. To boot a virtual machine in Ceph, the glance image format must be RAW. We will use the same cirros image that we downloaded earlier in this chapter and convert this image from the QCOW to RAW format (this is important). You can also use any other image, as long as it's in the RAW format:

    # qemu-img...