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====HA-Linux How-To For Testing And Educational Use====

References:
* [http://www.linux-ha.org/ HA-Linux Project Homepage]
* [http://greenbeedigital.com.au/content/howto-highly-available-zimbra-cluster-using-heartbeat-and-drbd Howto: Highly available Zimbra cluster using Heartbeat and DRBD]
* [http://www.drbd.org/ DRBD Homepage]
** DRBD currently unsupported at this time.
*** 1. "disaster recovery through server to server sync (beta)"
**** a. http://bugzilla.zimbra.com/show_bug.cgi?id=11423
*** 2. "add active-active support to zcs" , marked as a dup of the above.
**** b. http://bugzilla.zimbra.com/show_bug.cgi?id=28150

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=====Actual HA-Linux How-To For Testing And Educational Use Homepage=====

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Please see [[Ajcody-Notes-HA-Linux-How-To]]

=====Motive Behind How-To=====

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I hope this gives an easy way to setup through some clustering concepts for an administrator to gain some real-world experience when they currently have none. I plan on walking through each "function" that is behind clustering rather than jumping to an end setup (Linux-HA, Shared Storage, And Zimbra). 

The structure will be:
* Setup two machines (physical or virtual)
** Emphasis physical hostname / ip vs. the hostname and ip address that will be for HA.
* Setup virtual hostname and ip address for HA.
** Explain and do ip failover between the two machines.
* Setup a disk mount, we'll use probably use a nfs export from a third machine.
** This will give us an example of expanding the HA conf files to move beyond the ip address failover.
** Adjust HA conf's to now export via nfs a local directory from each server. This will not be a shared physical disk of course.
* Setup a shared disk between the two servers and include it in the HA conf files.
** Can use drbd or maybe figure out a way to share a virtual disk between the two vm's.
* Setup a very simple application to include between the two machines. Something like apache or cups.
* Go back and now readjust all variables between monitoring type (automatic) failover and simple manually initiated.

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[[Category: Community Sandbox]]
[[Category:Cluster]]
[[Category: Author:Ajcody]]
[[Category: Zeta Alliance]]