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

[Cristian Cristelotti]

Hi Sean,

Our experience with Grizzly (HA) was very bad. IceHouse (HA) was better but not stable . Now we are with JUNO on single-node and we haven't faced any problem .
We are working on the migration to KILO (HA + murano + ceilometer ).

KILO seems to have solved the problems mentioned by Fanis.
If you'll not deploy the node with HA you'll not have containers functionality or better you have to install swift manually after fuel deployment.



Regards

Cristian

----- Messaggio originale -----
Da: "Sean Murphy" <murp at zhaw.ch>
A: "Theofanis Katsiaounis" <th_katsiaounis at neuropublic.gr>
Cc: fiware-lab-federation-nodes at lists.fiware.org
Inviato: Venerdì, 13 novembre 2015 11:40:13
Oggetto: Re: [Fiware-lab-federation-nodes] [CESNET #134122] Re: experiences with HA



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 ] 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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Cristian Cristelotti

Collaboratore di Trentino Network Srl