M. Litmaath
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View article: WLCG transition from X.509 to Tokens: Progress and Outlook
WLCG transition from X.509 to Tokens: Progress and Outlook Open
Since 2017, the Worldwide LHC Computing Grid (WLCG) has been working towards enabling token-based authentication and authorization throughout its entire middleware stack. Taking guidance from the WLCG Token Transition Timeline, published i…
View article: Preliminary findings and recommendations from the Token Trust and Traceability Working Group
Preliminary findings and recommendations from the Token Trust and Traceability Working Group Open
Created in 2023, the Token Trust and Traceability Working Group (TTT) was formed in order to answer questions of policy and best practice with the ongoing move from X.509 and VOMS proxy certificates to token-based solutions as the primary …
View article: WLCG Operations: Evolution and Challenges on the Way to HL-LHC
WLCG Operations: Evolution and Challenges on the Way to HL-LHC Open
The WLCG[1] infrastructure is quickly evolving thanks to technology evolution in all areas of LHC computing: storage, network, alternative processor architectures, new authentication & authorization mechanisms, etc. This evolution also has…
View article: Unified Experiment Monitoring
Unified Experiment Monitoring Open
The Unified Experiment Monitoring (UEM) is the project in WLCG with the objective to harmonize the WLCG job accounting reports across the LHC experiments, in order to provide aggregated reports of the compute capacity used by WLCG as a fun…
View article: Site Sonar-A Flexible and Extensible Infrastructure Monitoring Tool for ALICE Computing Grid
Site Sonar-A Flexible and Extensible Infrastructure Monitoring Tool for ALICE Computing Grid Open
The ALICE experiment at the CERN Large Hadron Collider relies on a massive, distributed Computing Grid for its data processing. The ALICE Computing Grid is built by combining a large number of individual computing sites distributed globall…
View article: WLCG Transition from X.509 to Tokens. Status, Plans, and Timeline
WLCG Transition from X.509 to Tokens. Status, Plans, and Timeline Open
Since 2017, the Worldwide LHC Computing Grid (WLCG) has been working towards enabling token-based authentication and authorization throughout its entire middleware stack. Following the initial publication of the WLCG Token Schema v1.0 in 2…
View article: WLCG Token Usage and Discovery
WLCG Token Usage and Discovery Open
Since 2017, the Worldwide LHC Computing Grid (WLCG) has been working towards enabling token based authentication and authorisation throughout its entire middleware stack. Following the publication of the WLCG Common JSON Web Token (JWT) Sc…
View article: The SIMPLE Framework for deploying containerized grid services
The SIMPLE Framework for deploying containerized grid services Open
The Worldwide LHC Computing Grid (WLCG) currently has about 170 sites. In order to support WLCG workloads, each site has to deploy and maintain a number of possibly complex grid services. Quite often, site managers require assistance of WL…
View article: WLCG Authorisation; from X.509 to Tokens
WLCG Authorisation; from X.509 to Tokens Open
The WLCG Authorisation Working Group formed in July 2017 with the objective to understand and meet the needs of a future-looking Authentication and Authorisation Infrastructure (AAI) for WLCG experiments. Much has changed since the early 2…
View article: Proceedings, 23rd International Conference on Computing in High Energy and Nuclear Physics (CHEP 2018)
Proceedings, 23rd International Conference on Computing in High Energy and Nuclear Physics (CHEP 2018) Open
View article: WLCG Common JWT Profiles
WLCG Common JWT Profiles Open
This document describes how WLCG users may use the available geographically distributed resources without X.509 credentials. In this model, clients are issued with bearer tokens; these tokens are subsequently used to interact with resource…
View article: Lightweight WLCG Sites
Lightweight WLCG Sites Open
This article describes a new framework, called SIMPLE, for settingup and maintaining classic WLCG sites with minimal operational efforts and insights needed into the WLCG middleware. The framework provides a single common interface to inst…
View article: CHEP 2018: Preface to the Proceedings
CHEP 2018: Preface to the Proceedings Open
The 23 rd International Conference on Computing in High Energy and Nuclear Physics (CHEP) took place in the National Palace of Culture, Sofia, Bulgaria from 9 th to 13 th of July 2018. 575 participants joined the plenary and the eight para…
View article: Grid services in a box: container management in ALICE
Grid services in a box: container management in ALICE Open
Virtualization and containers are established tools for providing simplified deployment, elasticity and workflow isolation. These benefits are especially advantageous in containers, which dispense with the resource overhead associated with…
View article: New strategies of the LHC experiments to meet the computing requirements of the HL-LHC era
New strategies of the LHC experiments to meet the computing requirements of the HL-LHC era Open
The performance of the Large Hadron Collider (LHC) during the ongoing Run 2 is above expectations both concerning the delivered luminosity and the LHC live time. This resulted in a volume of data much larger than originally anticipated. Ba…
View article: Consolidating WLCG topology and configuration in the Computing Resource Information Catalogue
Consolidating WLCG topology and configuration in the Computing Resource Information Catalogue Open
The Worldwide LHC Computing Grid infrastructure links about 200 participating computing centres affiliated with several partner projects. It is built by integrating heterogeneous computer and storage resources in diverse data centres all o…
View article: Computing for the LHC: operations during Run2 and getting ready for Run 3
Computing for the LHC: operations during Run2 and getting ready for Run 3 Open
The computing infrastructure for the LHC data handling (Worldwide LHC Computing Grid- WLCG) was well prepared for Run 2 and delivered a steady data processing since the first colli- sions. Over the past years including the Run 1 period of …
View article: WLCG Monitoring Consolidation and further evolution
WLCG Monitoring Consolidation and further evolution Open
The WLCG monitoring system solves a challenging task of keeping track of the LHC computing activities on the WLCG infrastructure, ensuring health and performance of the distributed services at more than 170 sites. The challenge consists of…
View article: gLExec Integration with the ATLAS PanDA Workload Management System
gLExec Integration with the ATLAS PanDA Workload Management System Open
ATLAS user jobs are executed on Worker Nodes (WNs) by pilots sent to sites by pilot factories. This paradigm serves to allow a high job reliability and although it has clear advantages, such as making the working environment homogeneous, t…