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

Troubleshooting Calamari


Troubleshooting Calamari is sometimes very tricky. In this recipe, I have collected some recipes that will help you troubleshoot your Calamari environment.

How to do it…

  1. Check if the Calamari server, that is, the salt-master, could reach salt-minions:

    # salt '*' test.ping
    
  2. Check if salt-master can query the Ceph cluster and get cluster information:

    # salt '*' ceph.get_heartbeats output
    
  3. Check if the salt-minion node (Ceph cluster node) could reach the salt-master:

    # salt-minion -l debug
    
  4. Salt-minion throws an error, The Salt Master server's public key did not authenticate!, under the salt-minion log file, that is, /var/log/salt.

  5. To solve this problem, we need to delete the minion salt-key as well as the master public key and recreate both of them using the following commands:

    # rm -rf /etc/salt/pki/minion/minion_master.pub
    # systemctl stop salt-minion
    

    Now, perform the following set of steps:

    1. On salt-master, delete the minion key:

      # salt-key -L
      # slat-key -D <minion name...