[hobbit] HA-Hobbit with Linux HA 2

[Martin Flemming]

Great !

.. thanks a lot, i will testet it immediately,
if the time will be there ..

thanks & cheers

 	martin


On Mon, 30 Mar 2009, Husemann, Harald wrote:

> Hi folks,
>
> as written to the list a few days ago, we're running Hobbit on a Linux HA-2 
> cluster with DRBD. Runs very nice, and the setup is not very complicated, so 
> as promised, here are some notes if you like to make your Hobbit high 
> available:
> (This is more or less a summary of our installation, and not tested but 
> written from memory - maybe someone can test it and write a real step-by-step 
> guide)
>
> 1. Install Linux-HA on both nodes
> 2. Build a DRBD resource for the Hobbit files, as described in 
> http://www.drbd.org/docs/about/
> 3. Setup a Hobbit group
> 4. Setup a failover IP resource in the Hobbit group, with a DNS entry if you 
> have DNS
> 5. Install apache, and setup an apache failover resource in the Hobbit group 
> for it
> 6. Setup a colocation constraint, and bind the Hobbit group to the DRBD 
> resource
> 7. Setup an order constraint, to have DRBD started before Hobbit starts
> 8. Setup a Hobbit user as usual, and link its home directory to the DRBD 
> resource. This way, all Hobbit config files, datafiles, etc. are on DRBD , 
> and you don't have to fiddle around with syncing the configs etc.
> 9. Configure Hobbit sources as usual, with some notes:
>
> - Use the failover IP as Hobbit's server IP
> - Everywhere you would enter the Hobbitserver's name, enter the name of the 
> failover IP (e.g., for the web-based stuff)
>
> 10. Try to start Hobbit: It should run as normal.
> 11. Stop it, switch everything to the other node, and try to start Hobbit 
> again. If everything's okay, stop it, and you're ready for the final step:
>
> 12. Copy the attached script "hobbit" to /usr/lib/ocf/resource.d/heartbeat/ 
> ON BOTH NODES
>
> 13. Setup a Hobbit resource (e.g. by using the hb_gui and selecting "hobbit", 
> which should be visible after a restart of the GUI).
>
> 14. Start the Hobbit resource
>
> That's it, now, your Hobbit should be redundant and monitored by the OCF
>  system.
>
> Some final notes:
>
> - Be sure to use the failover IP as BBDISPLAY on all your clients
> - NEVER start/stop/restart Hobbit with hobbit.sh, since you could end up with 
> two running Hobbit instances (the cluster will see that hobbitd is down, and 
> start it itself). reload is (obviously) okay, since it will not restart the 
> process.
> - If you like to monitor your Hobbit nodes themselves, install a second 
> Hobbit (client) instance under a different user (e.g. hobbitmon), which is 
> not under cluster control. Without this, only the active node will be 
> monitored, since the server (and the client) runs only on this node.
>
> HTH,
>
> hh
>
> -- 
> Harald Husemann
> Netzwerk- und Systemadministrator
> Operation Management Center (OMC)
> MATERNA GmbH
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