[Openstack-operators] Cinder HA with zookeeper or redis?

Jay S Bryant jungleboyj at gmail.com
Mon Sep 10 21:32:07 UTC 2018


James,

Sorry, I forgot to include the link to our HA documentation in the 
earlier e-mail: 
https://docs.openstack.org/cinder/latest/contributor/high_availability.html

Jay


On 9/10/2018 3:39 PM, James Penick wrote:
> Ah ok so this is a case of no ones documented it, but it's do-able.
>
> If anyone out there has done it we'd be happy to take your notes! 
> Otherwise we'll figure it out and upstream the process.
>
> thanks!
> -James
>
> On Mon, Sep 10, 2018 at 2:18 PM Jay S Bryant <jungleboyj at gmail.com 
> <mailto:jungleboyj at gmail.com>> wrote:
>
>
>     On 9/9/2018 10:58 PM, Adam Spiers wrote:
>     > Hi James,
>     >
>     > James Penick <jpenick at gmail.com <mailto:jpenick at gmail.com>> wrote:
>     >> Hey folks,
>     >> Does anyone have experience using zookeeper or redis to handle HA
>     >> failover
>     >> in cinder clusters?
>     >
>     > I'm guessing you mean failover of an active/passive cinder-volume
>     > service?
>     >
>     >> I know there's docs on pacemaker, however we already
>     >> have the other two installed and don't want to add yet another
>     >> component to
>     >> package and maintain in our clusters.
>     >
>     > I'm afraid I don't, but if you make any progress on this, please let
>     > me know as it would be great to document:
>     >
>     >  - how this would work
>     >  - any pros and cons vs. Pacemaker
>     >
>     > and maybe I can help with that.
>     >
>     > One particular question: if the node running the service becomes
>     > unreachable, is it safe to fail it over straight away, or is fencing
>     > required first?  (I'm pretty sure I've asked this same question
>     > before, but I can't remember the answer - sorry!)
>     James,
>
>     I echo Adam's input.  I have only heard of people implementing with
>     pacemaker but there is no reason that this couldn't be tried with
>     other
>     HA solutions.
>
>     If you are able to try it and document it would be great to add
>     documentation here:  [1]
>
>     Also, Gorka Eguileor is a good contact as he has been doing much
>     of the
>     work on HA Cinder though his focus is on Active/Active HA.
>
>     Let us know if you have any further questions.
>
>     Thanks!
>     Jay
>

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