Zimbra on Pacemaker + DRBD howto

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Originally Posted by Taer

Hi Folks!

Just wanted to say that I tried the bTactic Zimbra OCF script with Zimbra 8 OSE & Ubuntu 12.04 x64, and all is working fine.

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That's a great piece of news.

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Originally Posted by Taer

If it can help, this is how I integrated the Zimbra script (invented nothing, that's what the spanish doc is saying) :

On each VM of the cluster, do the following :

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mkdir /usr/lib/ocf/resource.d/btactic

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- Put the script in this folder.

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chmod +x /usr/lib/ocf/resource.d/btactic/*

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On one of the VMs enter:

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crm configure

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, and inject the config :

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primitive ZMServer ocf:btactic:zimbra \
op monitor interval="120s" timeout="40s" \
op start interval="0" timeout="360s" \
op stop interval="0" timeout="360s"

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Thank you! These small pieces of code where you explain how you have done things yourself are very meaningful for people that try to understand how all this stuff it goes.

And, of course, it clarifies that the script works for someone else than the original writer.

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Originally Posted by Taer

Thank you for this wonderfull tool Adrian. :D It made me save a lot of time.

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You're welcome. If you ever document your work don't hesitate to share a link here.

It would be nice to know if the zimbra mysql gets corrupted somehow when one of the active/pasive cluster machines dies. This first version of the howto does not replicate mysql as a normal mysql replication but with files thanks to DRBD as you might know.

As a part of my University thesis is highly probable that this howto is:

• Translated into English
• Improved to be accepted as a University thesis paper
• to be added mysql replication (not sure about that)
• Adapted (if needed) to Ubuntu 12.04 and Zimbra 8
• Use more common network setups (not sure about that)

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Just in case anyone wanted to translate the whole howto into English. I will do myself in the next six months.

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Originally Posted by adrian.gibanel.btactic

That's a great piece of news.


Thank you! These small pieces of code where you explain how you have done things yourself are very meaningful for people that try to understand how all this stuff it goes.

And, of course, it clarifies that the script works for someone else than the original writer.

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You're welcome, I'm glad to help.

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Originally Posted by adrian.gibanel.btactic

If you ever document your work don't hesitate to share a link here.

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I am indeed curently writing a modus operandi for the archives of the IT Department, when it'll be finished I will be happy to translate it in english for sharing with the community. :)

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Originally Posted by adrian.gibanel.btactic

It would be nice to know if the zimbra mysql gets corrupted somehow when one of the active/pasive cluster machines dies. This first version of the howto does not replicate mysql as a normal mysql replication but with files thanks to DRBD as you might know.

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So far I got no problems with a single dead machine. I started reading and working about HA something like 2 weeks ago, but if I understood correctly the working of DRBD it keeps all the modifications in memory so when the other node is alive and ready for sync again, it sends them. And until now, this was confirmed by all my tests. But I'll try to lost my Master during a serie of zmprov operations. (Wouldn't be surprised if Zimbra's devs put a COMMIT in all LDAP provisioning tools thought.)
And I'm a little concerned about split brain issues too, anyway I'll keep you update of that all.


Ho, and good luck for your University thesis.

Hello everyone!

Got some news today, I made a little how-to explaining how I built my Zimbra cluster:

https://www.dropbox.com/s/8w4f7koz9y...HA_Zimbra8.pdf

A few words about it, to catch on:
This how-to explains the HA installation of Zimbra 8 on an Ubuntu server 12.04 LTS x64, the HA will be made between two VM named fangorn (preferred master) and
sylvebarbe (slave).
Two different storage technics were tried: DRBD (for all Zimbra files: /opt/zimbra), and virtual bus sharing by VMware on a SAN (for index and mails, which are by default on /opt/zimbra/index and /opt/zimbra/mail).

And I made some tests, all my results are included on the above PDF, I already can say here that I haven't noticed any corruption of Zimbra's database. But it would be nice if someone else could try and confirm... or not. :)

Congratulations!

It seems I missed your message. Zimbra 8 HA in Ubuntu 12.04 seems not as different as my original howto finally.
I'm going to update my howto as a University thesis paper anyways, probably in 6 months time.
Your howto will help me a lot.

Adrián Gibanel