Nov 4 – 8, 2019
Adelaide Convention Centre
Australia/Adelaide timezone

Evolution of the load balancing server

Nov 5, 2019, 3:30 PM
Hall F (Adelaide Convention Centre)

Hall F

Adelaide Convention Centre

Poster Track 7 – Facilities, Clouds and Containers Posters


Pablo Saiz (CERN)


The Load Balance Service at CERN handles more that 400 aliases,
distributed over more than 2000 nodes. After being in production for
more than thirteen years, it has been going through a mayor redesign
over the last two years. Last year, the server part got reimplemented in
golang, taking advantage of the concurrency features offered by the
language to improve the scaling of the system. This year, the client
side and the communication between the client and the server have been
the main focus. First of all, the client part of the Load Balance Service has
been rewritten in golang. On top of that, it was evaluated to move from a model
where the server probes the clients, to a model where the clients
announce their states. This has a quite a lot of implications in the
frequency of the updates, the security model and the deployment of the
service. Finally, it was also evaluated to offer
'HAProxy as a Service', taking feedback on the client members using the same probes currently used for the DNS load balancing.

All the components used by the Load Balance Service are open source, and
they can be deployed at other places

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