Construction of real-time monitoring system for Grid services based on log analysis at the Tokyo Tier-2 center

The Tokyo Tier-2 center, which is located in the International Center for Elementary ParticlePhysics at the University of Tokyo, is providing computer resourcesfor the ATLAS experimentin the Worldwide LHC Computing Grid. Logs produced by the Grid services provide useful information to determine whether the services are working properly. Therefore, a new real-time monitoring system based on log analysis has been constructed using the ELK stack. This paper reports the configuration of the new monitoring system at the Tokyo Tier-2 center, and discusses improvements in terms of stability and flexibility of the site operation by introducing the new monitoring system.