[ubuntu-cloud] UEC Single Point of failure

[Björn Böttcher]

Thanks for your replies so far. Based on your experience, are there any
recommended open source load balancer available?

2010/11/4 Zeeshan Ali Shah <zashah at pdc.kth.se>

> I assume Amazon has same kind of notion "CLC" , how they managed to get
> the load balance so effictevely ?
>
> Zeeshan
>
> On 11/04/2010 09:23 AM, Torsten Spindler wrote:
> > On Thu, 2010-11-04 at 09:13 +0100, Björn Böttcher wrote:
> > ...
> >
> >
> >> Still open question:
> >> But do the multiple CC/SC machines synchronize automatically?
> >>
> > Nope, the cluster controllers (CC) manage different clusters and do not
> > synchronize any state between them. Same for the storage controllers
> > (SC) that are attached to different clusters.
> >
> > Instead your payload on UEC (e.g. a webapp) needs to be tailored for
> > fault tolerance, when a cluster fails. For example, a load balancer
> > outside of UEC may direct requests to either cluster in your UEC. If one
> > fails, the load balancer learns about it (maybe through a heartbeat?)
> > and directs any requests to the remaining cluster(s).
> >
> > On your original question, the cloud controller (CLC) is indeed a single
> > point of failure. Putting it on hardware that provides some resilience
> > towards failures is best practice there.
> >
> > Torsten
> >
> >
> >
> >
>
>
> --
> Regards
>
> Zeeshan Ali Shah
> System Administrator
> PDC-Center for High Performance Computing
> KTH-Royal Institute of Technology , Sweden
> +46 8 790 9115
>
>
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