Why High Availability Clustering is awesome

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Clustering is Awesome Pacemakers, Death by Storage, and Shooting Servers in the Head Richard Brown - QA Engineer @ SUSE [email protected]

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2 About Me • QA Engineer at SUSE since November 2013 ‒ High Availability Clustering ‒ openQA • SysAdmin at a UK College since 2002 ‒ Early adopter of HA technologies • openSUSE contributor since 2005 ‒ Chairman of the Board

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3 Topics • Why do we need High Availability? • How it works • How to install it on openSUSE

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Why do we need HA?

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5 What is HA? High Availability

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6 What is HA? “The definition of availability is Ao = up time / total time. This equation is not practical, but if (total time - down time) is substituted for up time then you have Ao = (total time - down time) / total time.” - Wikipedia (CC-BY-SA)

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8 But Linux is already stable!

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9 But Linux is already stable! “Linux has never been about quality. There are so many parts of the system that are just these cheap little hacks, and it happens to run.” - Theo de Raadt

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12 It's not just software or hardware that can let you down...

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15 Servers fail, no one else can help

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16 Servers don't really matter

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17 Services Matter, not Servers

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How HA Works

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21 Server 1 Server 2

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22 Server 1 Server 2 Web Server Apache File Server Samba

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23 Server 1 Server 2 Web Server Apache File Server Samba

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24 Server 1 Server 2 Web Server Apache File Server Samba

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25 Server 1 Server 2 Web Server Apache File Server Samba Um, I still need my files

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26 Server 1 Server 2 Web Server Apache File Server Samba Local Disk Local Disk

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27 Server 1 Server 2 Web Server Apache File Server Samba Local Disk Local Disk RSYNC

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28 Server 1 Server 2 Web Server Apache File Server Samba Local Disk Local Disk DRBD

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29 Server 1 Server 2 Web Server Apache File Server Samba Shared Disk eg. FC/iSCSI

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30 Server 1 Server 2 Web Server Apache File Server Samba Shared Disk eg. FC/iSCSI Server 3 DB Server MariaDB

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31 Odd Number of servers = better

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32 Odd Number of servers = better

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33 Server 1 Server 2 Web Server Apache File Server Samba Shared Disk eg. FC/iSCSI Server 3 DB Server MariaDB

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34 Server 1 Server 2 Web Server Apache File Server Samba Local Disk Local Disk DRBD

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Installation on openSUSE

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36 Installation • openSUSE Tumbleweed or 13.2 zypper in ha-cluster-bootstrap • On first server ha-cluster-init Wizard will ask you all the important questions • On other servers ha-cluster-join -c

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37 Further Reading & Community • Documentation https://www.suse.com/documentation/sle-ha-12/ • DRBD http://drbd.linbit.com/ • IRC #ha-devel on Freenode • Mailing List [email protected]

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38 Have a Lot of Fun, and Join Us At: www.opensuse.org

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General Disclaimer This document is not to be construed as a promise by any participating organisation to develop, deliver, or market a product. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. openSUSE makes no representations or warranties with respect to the contents of this document, and specifically disclaims any express or implied warranties of merchantability or fitness for any particular purpose. The development, release, and timing of features or functionality described for openSUSE products remains at the sole discretion of openSUSE. Further, openSUSE reserves the right to revise this document and to make changes to its content, at any time, without obligation to notify any person or entity of such revisions or changes. All openSUSE marks referenced in this presentation are trademarks or registered trademarks of SUSE LLC, in the United States and other countries. All third-party trademarks are the property of their respective owners. License This slide deck is licensed under the Creative Commons Attribution-ShareAlike 4.0 International license. It can be shared and adapted for any purpose (even commercially) as long as Attribution is given and any derivative work is distributed under the same license. Details can be found at https://creativecommons.org/licenses/by-sa/4.0/ Credits Template Richard Brown [email protected] Design & Inspiration openSUSE Design Team http://opensuse.github.io/branding- guidelines/