[ClusterLabs] About fencing stonith

Klaus Wenninger kwenning at redhat.com
Fri Sep 7 06:03:03 EDT 2018

On 09/07/2018 11:41 AM, Klaus Wenninger wrote:
> On 09/06/2018 10:47 PM, Digimer wrote:
>> On 2018-09-06 04:33 PM, Marcos Renato da Silva Junior wrote:
>>> Hi,
>>> I created a testing environment based on Raspberry Pi (attached
>>> diagram), in my tests it has worked well, but I did not implement
>>> anything about fencing and stonith, what is the need and how to implement?
>>> Thanks,
>>> Marcos.
>> It depends on the hardware you have available. In your case, RPi has no
>> IPMI or similar feature, so you'll need something external, like a
>> switched PDU. I like the APC AP7900 (or your countries variant), which
>> you can often get used for a decent price if this isn't a production system.
>> http://www.apc.com/shop/us/en/products/Rack-PDU-Switched-1U-15A-100-120V-85-15/P-AP7900
> For a test-environment switching mains might be an overkill.
> And it makes the nice and tiny test-environment a lot less
> nice and tiny ;-)
> Anyway the scenario made me google a little bit.
> e.g.: https://www.yepkit.com/products/ykush

Some code and a list of alternative devices:

> is what I stumbled over.
> Add a RPi to it and you have IP-controlled USB-power.
> (Guess I have to order one to play with ;-) )
> On the other hand iirc the Broadcom-SOC found in the RPi
> has a hardware-watchdog the linux-kernel has a driver
> for. So you might consider going for SBD (no shared disk)
> with watchdog-fencing as well.
> But that would require you to add a 3rd node (or some
> kind of shared disk).
> Andrew's blog article is a nice introduction:
> http://blog.clusterlabs.org/blog/2015/sbd-fun-and-profit
> Klaus
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