Re: [ClusterLabs] Antw: OS Patching Process

2016-11-23 Thread Dmitri Maziuk 

On 2016-11-23 02:23, Ulrich Windl wrote:


I'd recommend making a backup of the DRBD data (you always should, anyway),
the shut down the cluster, upgrade all the needed components, then start the
cluster again. Do your basic tests. If you corrupted your data, re-create DRBD
from scratch. Then test again. If your data is currupted again, the new version
has a problem. Then you should go back to your old version (You have
desaster-suitable backups, right?).


Very funny: run a full backup a small 100TB live mail spool for a kernel 
upgrade. When the cluster fscks it up, run a full restore. While the 
mail spool is highly unavailable.


How about an easier solution: never install any patches. Or better yet 
don't use pacemaker. Hilarious.


Dima


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[ClusterLabs] Antw: OS Patching Process

2016-11-23 Thread Ulrich Windl 
>>> Jason A Ramsey  schrieb am 22.11.2016 um 17:35 in
Nachricht
<37447f13-a83e-455b-82df-933ec7eab...@eramsey.org>:
> Can anyone recommend a bulletproof process for OS patching a pacemaker 
> cluster that manages a drbd mirror (with LVM on top of the drbd and luns 
> defined for an iscsi target cluster if that matters)? Any time I’ve tried
to 
> mess with the cluster, it seems like I manage to corrupt my drbd filesystem,

> and now that I have actual data on the thing, that’s kind of a scary 
> proposition. Thanks in advance!

I'd recommend making a backup of the DRBD data (you always should, anyway),
the shut down the cluster, upgrade all the needed components, then start the
cluster again. Do your basic tests. If you corrupted your data, re-create DRBD
from scratch. Then test again. If your data is currupted again, the new version
has a problem. Then you should go back to your old version (You have
desaster-suitable backups, right?).

Ulrich

> 
> --
> 
> [ jR ]
> 
>   there is no path to greatness; greatness is the path




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