9-13 July 2018
Sofia, Bulgaria
Europe/Sofia timezone

Notifications workflows using the CERN IT central messaging infrastructure

10 Jul 2018, 15:00
Hall 10 (National Palace of Culture)

Hall 10

National Palace of Culture

presentation Track 8 – Networks and facilities T8 - Networks and facilities


Zhechka Toteva (CERN)


In the CERN IT agile infrastructure, Puppet, CERN IT central messaging infrastructure and the roger application are the key constituents handling the configuration of the machines of the computer centre. The machine configuration at any given moment depends on its declared state in roger and Puppet ensures the actual implementation of the desired configuration by running the puppet agent on the machine at regular intervals, typically every 90 minutes. Sometimes it is preferable that the configuration change is propagated immediately to the targeted machine, ahead of the next scheduled puppet agent run on this machine.
The particular need of handling notifications in a highly scalable manner for a large scale infrastructure has been satisfied with the implementation of the CERN Megabus architecture, based on the ActiveMQ messaging system.
The design and implementation of the CERN Megabus architecture are introduced, followed by the implementation of the roger notification workflow. The choice of ActiveMQ is analysed and the message flow between the roger notification producer and the CASTOR, EOS, BATCH and Load Balancing consumers are presented. The employment of predefined consumer modules in order to speed up the on-boarding of new CERN Megabus use cases are also described.

Primary authors

Zhechka Toteva (CERN) Lionel Cons (CERN) Mr Darko Lukic (University of Novi Sad (RS))

Presentation Materials