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Showing entries 1 to 20

Displaying posts with tag: linux-ha (reset)

High Availability MySQL Cookbook , the review
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When I read on the internetz that Alex Davies was about the publish a Packt book on MySQL HA I pinged my contacts at Packt and suggested that I'd review the book .

I've ran into Alex at some UKUUG conferences before and he's got a solid background on MySQL Cluster and other HA alternatives so I was looking forward to reading the book.

Alex starts of with a couple of indepth chapters on MySQL Cluster, he does mention that it's not a fit for all problems, but I'd hoped he did it a bit more prominently ... an upfront chapter outlining the different approaches and when which approach is a match could have been better. The avid reader now might be 80 pages into MySQL cluster before he realizes it's not going to be a match

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Upstart support coming to Pacemaker
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Thanks primarily to the efforts of Senko Rašić and Ante Karamatić, the Pacemaker cluster stack is being augmented with support for Upstart services. This is in addition to support for OCF resource agents and LSB/SysV init scripts, both of which have been supported in Pacemaker for years.

This is functionality now present in the upstream Mercurial trees, and we need testers to get in shape for release. Yes, that means you can help!

This is primarily relevant to you if you use a distribution with upstart as its default init daemon. This includes Ubuntu lucid, OpenSuSE 11.3, recent

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Upcoming High Availability Clustering miniconf at Linux Plumbers Conference
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This year’s Linux Plumbers Conference is taking place November 3-5, in Cambridge, MA, United States. The CfP is already closed and the program is due any day now, but the co-located miniconference on high availability clustering is still accepting proposals. This is your chance to get involved!

So if you plan to attend Plumbers or just happen to be in the area, please submit your talk! Miniconference talks are not expected to be full-blown

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Automating MySQL replication with Pacemaker
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A little while back we did a webinar on using Pacemaker to fully automate MySQL replication. We now have a recording of that webinar available from our web site.


New webinar recordings available
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A couple of new webinar recordings are available from our web site:

Like our live webinars, the recordings are of course free of charge. Enjoy!



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In case you haven’t noticed, we no longer manage clusters with XML
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While Yves presents a valid approach for managing NDB with Pacemaker and the anything Linux-HA resource agent (a generic wrapper for any daemon based application), the XML configuration shown is likely to have people running away screaming. This is how we had to do things back in the Heartbeat 2 days, which meant that as a cluster admin you would permanently run around with a loaded cocked shotgun with the muzzle pressed firmly against your foot.

Those days are long gone. Please don’t do this anymore. You also no longer need to use the low-level tools such as cibadmin or crm_attribute.

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Ubuntu 10.04 with full cluster stack support
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Just in case you haven’t noticed, Ubuntu 10.04 “Lucid Lynx” has arrived. I upgraded my personal box over the weekend, and am happy to report that things went pretty flawlessly for me. So I’m now a happy lucid user.

What’s more important for the ever-growing cluster community is the fact that this LTS release comes with built-in support for the Pacemaker cluster stack — and indeed, it’s the first commercially-supported distribution that comes with support for both the Heartbeat and the Corosync cluster messaging layer. And it’s easy, too!

Here’s how I install the Pacemaker stack with Heartbeat

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MySQL master/slave support merged into Linux-HA
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MySQL replication support for the Pacemaker cluster manager (the stuff that we explained in this webinar) has made it into the Linux-HA resource agents default branch. If you are interested in testing — and you should! — please read the extended announcement. Feedback is extremely welcome on the linux-ha-dev mailing list.

We are expecting to release this as part of resource-agents 1.0.4, in late May/early

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Upcoming webinar: Oracle high availability with DRBD and Pacemaker
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We’re sticking with databases for our current round of webinars. Up next is an overview of Oracle high availability clustering on Linux.

In this 45-minute presentation, we will show you how to quickly and easily configure an Oracle database with an associated TNS Listener in a failover configuration, how to monitor both your database and your listener for failures, and how to have Pacemaker automatically intervene and recover from outages.

Brought to you in association with our friends over at Novell, we’ll showcase Oracle in combination with SUSE Linux Enterprise High Availability Extension.

This webinar is scheduled for April 28, 2010 at 1500 UTC.

As all of our

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See you at LinuxTag 2010
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I just got word that a talk about iSCSI High Availability with Pacemaker and DRBD, which I submitted for LinuxTag 2010, has been accepted by the selection committee.

The presentation is entitled Storage Done Right: Building a Resilient, Distributed, Highly Available Open Source iSCSI SAN and I will talk in the Storage track, in English. Questions in German, of course, won’t be a problem.

As the conference organizers have asked speakers not to publicize the temporary schedule (for obvious reasons — hey it’s temporary), I can’t give the exact time and location yet. But if you want to hear about how you can replace your six-figure SAN with something much more open, much less locked-in and much less

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MySQL/Pacemaker scaleout webinar recording available
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Yesterday’s webcast is now available for playback.

If you want a PDF of the slides, please leave a note on our web site.

Update, July 19, 2010: We have switched our webinar service provider. The webinar recordings are still available, albeit under a different URL, see

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UKUUG Spring Conference 2010
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Last week I was in Manchester for the 2010 UKUUG Spring Conference, right .. make that 2 weeks ago , :)

The UKUUG usually hosts the more interesting conferences around ... , it's not just the schedule that attrackts me , yes there's the strong focus towards Larger Scale Unix (and mostly Linux) deployments and how to manage them, but there's also the opportunity to chat in real life with the Devops from across the chunnel.

Spending time with R.I.Pienaar, Julian Simpson, Simon Wilkinson , Alex Davies , Simon Riggs , Josette, and many others is always fun .

As I was in town early I went to

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Complete Pacemaker cluster stack now in Debian
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Thanks to the efforts of the Debian HA Maintainers team, the complete Pacemaker cluster stack is now available in Debian GNU/Linux. Packages are currently included only in Debian unstable (“sid“), but we expect them to make their way into squeeze (and lenny, via backports.org) relatively soon.

See the following links in the Debian package database for details:

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Reminder: MySQL/Pacemaker scaleout webinar Wednesday 1500 UTC
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As announced previously, our MySQL/Replication/Pacemaker webinar is on tomorrow (Wednesday April 7) at 1500 UTC. A few seats are still left; you may want to register quickly.



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April Fool
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Relax. There is no DRBD Windows port.

And of course, deploying Windows machines in a highly available, synchronously replicated enterprise cloud is something you can do today. Heartbeat, Pacemaker, DRBD, libvirt and KVM make an excellent, fully integrated HA virtualization stack.



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MySQL scale-out with replication and Pacemaker
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It seems that the MySQL Conference selection committee didn’t seem to like the talk (and tutorial) I submitted about integrating MySQL Replication with the Pacemaker cluster stack, enabling full MySQL scale-out in an environment you previously knew only for its synchronous-replication High Availability (http://www.mysql.com/drbd) features. But — fear not, my fellow HA geeks! — we are instead making the talk available for free, over the web, one week ahead of the conference.

In this 45-minute presentation, we will give an overview about

  • the Pacemaker cluster stack and the Linux-HA project it evolved out of;
  • the current state of MySQL integration in Pacemaker, and of course
  • leveraging Pacemaker’s built-in clone infrastructure for MySQL Replication.
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Contributing resource agent patches to Linux-HA
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If you contribute a resource agent to the Linux-HA repository, we love you. If you contribute a patch to an existing resource agent, and fix an bug or add functionality, we love you too. If you persist through the constructive criticism by nitpicks like myself on the linux-ha-dev mailing list, we love you even more.

And here’s a couple of ideas for making the process easy:

  • Please please please send patches. Working in a Mercurial checkout and then using hg export or hg email makes reviewing and merging your patch a breeze.
  • If you really do not want to familiarize yourself with Mercurial, then please take your version of the RA,
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Got Interviewed
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by @botchagalupe
on Virtualization, Open Source tools and DNS Problems

Technorati Tags: dnsproblem drupal ha heartbeat linux-ha mysql pacemaker puppet virtualization xen
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Nines , Damn Nines and More Nines
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Funny how different experiences lead to different evaluations of tools. The MySQL HA solutions the MySQL Performanceblog list, are almost listed in the complete opposited order of what my impressions are.

Ok agreed, I should probably not put my MySQL NDB experiences from 2-3 years ago with multiple Query of deaths and more problems than you into account anymore , but back then went in the list Less stable than a single node. I've had NDB POC setups going down for much more than 05:16 minutes
Ndb comes with a lot of restrictions, there are

As for MySQL on DRBD, I've said this before , I love DRBD, but having to wait for a long InnoDB recovery after a failover


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DRBD Management Console
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Wow, check out what just came out from Linbit: The DRBD Management Console. Written in Java (so it runs anywhere), completely open source (GPLv3), and allows you to manage DRBD and Heartbeat based clusters. You can install, configure, see your systems graphically, and a lot more. I’m interested to try the beta out, as soon as I get back to my lab (sitting in the airport now). If you know how to use DRBD/Heartbeat, and use it in production for your MySQL setup, it might be a good application to test out, and improve if need be.

From the screenshots, I’m surprised this isn’t a value added extra that Linbit would like to charge for. Kudos, Linbit, for keeping it GPLv3!

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Showing entries 1 to 20

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