Bart Van Brabant

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Every organization with more than a few system administrators has policies in place. These policies define who is allowed to change what aspects of the configuration of a computer infrastructure. Although many system configuration tools are available for automating configuration changes in an infrastructure, very little work has been done to enforce the(More)
System configuration tools automate the configuration and management of IT infrastructures. However these tools fail to provide decent authorisation on configuration input. In this paper we apply fine-grained authorisation of individual changes on a complex input language of an existing tool. We developed a prototype that extracts meaningful changes from(More)
We believe that informed choices are better choices. When you adopt a system configuration tool, it implies a significant investment in time and/or money. Before making such an investment, you want to pick the right tool for your environment. Therefore, you want to compare tools with each other before making a decision. To help you make an informed choice,(More)
IT infrastructures just needs to work and at the same time adapt to changing requirements. A significant amount of their downtime is caused by configuration errors and because all other subsystems depend on the network, network errors there have a big impact. Configuration errors are often caused by parameters that are inconsistent because changing one(More)
The deployment of applications in hybrid and multi-cloud environments avoids vendor lock-in and reliance on a single cloud provider. The virtual compute infrastructures of IaaS provides enables enterprises to build large scale, geo-graphically distributed applications. Each IaaS provider offers virtual machines that can communicate with each other over a(More)
The manual configuration and management of a modern network infrastructure is an increasingly complex task. This complexity is caused by factors including heterogeneity, a high degree of change and dependencies between configuration parameters. Due to increasing complexity, manual configuration has become time consuming and error prone. This paper proposes(More)
SaaS providers typically adopt a multi-tenant architecture to leverage economies of scale. By maximizing the sharing of resources among multiple customer organizations, called tenants, operational costs are reduced. However, this high degree of resource sharing complicates performance isolation between tenants: different tenants have different requirements(More)
All security and non-security equipment in a IT infrastructure has to be consistent with the configuration of the entire IT infrastructure. System management tools are used to manage contemporary IT infrastructures in an efficient and secure manner, and ensure its configuration is consistent and correct. System configuration tools achieve this by using a(More)
IT infrastructure management is becoming increasingly complex due to the increasing size and complexity of IT infrastructures. This complexity leads to errors and subsequently to failure. Configuration errors caused by operator errors are a significant contributor to downtime. These errors are often introduced by failing to update all dependent(More)
Providing elementary resources to research institutes, storing a part of the world's biodiversity and carrying out essential research, biological resource centers (BRCs) fulfil an important role in contemporary life sciences. There are currently over 500 BRCs registered at the World Data Center for Microorganisms. All of these institutes offer information(More)
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