[Fiware-lab-federation-nodes] [CESNET #134122] Re: experiences with HA

[Sean Murphy]

Hi all,

So the feedback so far is the following:
- Riwal says that running Juno/HA is not so problematic, but has not had a
specific failure
situation where HA could really be tested
- Fernando notes that Juno/HA exhibited stability problems for larger
numbers of users and
decided against it
- Fanis notes that Icehouse/HA was quite problematic in multiple respects

>From our pov, this is not painting a v positive picture regarding HA and
despite
our inclination to experiment with newer technologies we would prob opt not
to
use HA.

Does anyone in the project have Kilo/HA experience?

BR,
Seán.



On Fri, Nov 13, 2015 at 10:38 AM, Theofanis Katsiaounis <
th_katsiaounis at neuropublic.gr> wrote:

> Hi all,
> we had HA on Icehouse and it was a mess. Especially with the
> Networking/Neutron part. Namespaces were not transfered between nodes so if
> one went down vm's lost networking. Reboots were a lottery indeed,
> sometimes they worked sometimes they did not. And when we lost power once i
> had to rebuild the node.
> Of course the FIWARE lab handbook asks for an HA solution but i see in the
> case of Spain this has already been violated ;).
> My two cents is that the guys from Spain made the right choice. I do not
> think HA in openstack is ready for production especially with a big number
> of users.
>
> Regards,
> Fanis
>
> On 13/11/2015 11:33 πμ, Riwal KERHERVE wrote:
>
> Sean,
>
>
>
> In Grizzly, anytime we needed to restart processes handled by CRM, it was
> a lottery. Sometimes, everything went fine and sometimes the processes keep
> on rebooting and it take us hours to put back things in order.
>
> In Juno, we never experienced this kind of behavior. When we needed to
> restart processes trough CRM, all always went fine.
>
>
>
> To answer to your question:
>
> The only time, we played with HA, it was to take into account some
> modification in our configuration files. I do not recall exercising HA
> capabilities, like the need of putting one node down and switching all
> processes to the other node.
>
>
>
> BR
>
> Riwal
>
>
>
> *De :* sean at gopaddy.ch [mailto:sean at gopaddy.ch <sean at gopaddy.ch>] *De la
> part de* Sean Murphy
> *Envoyé :* jeudi 12 novembre 2015 17:01
> *À :* Riwal KERHERVE
> *Cc :* fiware-lab-federation-nodes at lists.fiware.org
> *Objet :* Re: [CESNET #134122] Re: [Fiware-lab-federation-nodes]
> experiences with HA
>
>
>
> Hi Riwal,
>
>
>
> Good feedback - thanks for that.
>
>
>
> As a matter of interest, have you ever needed to exercise any of the HA
>
> capabilities or have you tested it in anger?
>
>
>
> BR,
>
> Seán.
>
>
>
> On Thu, Nov 12, 2015 at 4:51 PM, Riwal KERHERVE via RT <
> xifi-support at rt.cesnet.cz> wrote:
>
> Sean,
>
> I do not have experience with Kilo in HA, but our node is in Juno and in
> HA. We installed it with fuel 6.0 (2 controllers and 1 Arbitrator). We
> never have any trouble until now: very stable, nothing to be with HA in
> grizzly.
>
> BR
> Riwal
>
> De : fiware-lab-federation-nodes-bounces at lists.fiware.org [mailto:
> fiware-lab-federation-nodes-bounces at lists.fiware.org] De la part de Sean
> Murphy
> Envoyé : jeudi 12 novembre 2015 16:33
> À : fiware-lab-federation-nodes at lists.fiware.org
> Objet : [Fiware-lab-federation-nodes] experiences with HA
>
>
> Hi all,
>
> We're looking at our upgrade strategy and we're curious to
> hear any experience with Kilo HA both from the deployment
> perspective as well as the operations perspective.
>
> From xifi, I remember Fanis reporting a split-brain scenario
> with HA and in the end he opted not to go with a HA solution;
> this gives me pause for thought when considering this
> deployment solution, even though it seems to be the
> preferred solution.
>
> Generally, we would be well disposed to a HA deployment
> as we would like to learn about it, but we do not want to
> end up deploying a technology that is too far from production
> readiness.
>
> Does anyone have any experience that they can share on this
> point?
>
> BR,
> Seán.
>
>
>
>
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