Jakub Pavlik

Statistics and analysis of service availability in cloud computing

This paper focuses on solving the problem of measuring and monitoring service availability in Cloud Computing. It introduces existing Service-Level Agreement (SLA) monitoring approaches and frameworks. On this basis, it presents a new approach which monitors cloud service availability from the client-centric point of view. This approach was designed, implemented and tested on a sample cloud environment. The measured data is statistically analyzed to obtain results which are as accurate as possible. The entire process of monitoring and statistical analysis is automated so that it can be incorporated in further research to create a complete solution for managing SLA in Cloud Computing from a client-centric perspective.

Gateway redundancy protocols

This paper covers how to increase the availability of data networks. Issue of high available services is very actual today. Redundancy is usually solved by the Spanning Tree Protocol on the 2nd layer of ISO/OSI model. This paper is dedicated to redundancy on 3rd layer of ISO/OSI model. The goal of paper is to explore possible solutions for the default gateway redundancy to increase availability of external networks. The survey is focused on FHRP (First Hop Redundancy Protocol) protocols, description of their functionality, network communication, and basic configuration. Next aim of the paper is comparison of these protocols and real time measurements of protocol performance. Outcome of the paper is functional description of HSRP, VRRP and GLBP protocols. Meaning of parameters in communication messages of HSRP and VRRP protocols is explained further. Paper contains basic configuration for every protocol with brief explanation of configuration commands. Measurements delay of choosing new active gateway has been performed on physical topology with physical devices. Latest version of FHRP was used during these measurements. The measured results indicate that performance of tested FHRP protocols is almost equivalent.

Security information and event management in the cloud computing infrastructure

Security of information systems is a current topic. In the case of cloud environment it is even a critical factor. In large environments like the cloud computing systems, it can be difficult to maintain a comprehensive view of the safety of the individual elements. For this reason, the utilization of technology that would allow central monitoring and that would help to maintain this awareness. Such technology is precisely Security Information and Event Management (SIEM). The main objective of this paper is to analyze the possibilities and approaches of SIEM in terms of technical requirements, logic and legal framework of the Czech Republic. On the analytical basis, the framework, which is bounding the utilization of SIEM in a cloud computing environment is proposed.

Enterprise ICT Transformation to Agile Environment

This paper describes how modern configuration management tools change the rate of change of enterprise processes. Enterprise rely on standard frameworks like ITIL, TOGAF or COBIT to cope with change. These frameworks define process flows how to model, deploy and run complex systems in predictable way. Using these frameworks enterprise can archive predictable outcomes in given time. The speed of required changes has grown and traditional configuration tools like IBM Tivoli Configuration and Change Management Database and IBM SmartCloud Control Desk soft cannot cope.

Network Visualization Survey

This paper compares modern approaches to draw complex graph data that create create compelling visualizations. Graphs are used to represent more and more complex systems that are used across various scientific domains. Some graph visualizations are used to model network topologies or service architectures in information service fields, model genomes in biomedicine or complex molecules in chemistry. Visualizations of graph data play important role in interpreting the meaning of graphed data. The adage “A picture is worth a thousand words” generally refers to the notion that a complex idea can be conveyed with just a single still image and that is actually the main reason for creating visualisations of any kind. Graph drawings from all domains follow the same rules covered by the graph theory. This work outlines different layout strategies used for drawing graph data. Tested graph drawing layouts are compared by standard quality measures to determine their suitability for various areas of usage.

Utilization of Cloud Computing in Education with Focus on Open-Source Technologies

Cloud Computing uses possibilities of remote and instantly unlimited access to informational system sources. It accesses server systems using data networks like LAN, WAN, and World Wide Web with protocols HTTP, HTTPS, etc. Users, then, can access Cloud and its mediated server services through commonly available technological devices like laptops, desktop computers, smart phones, and tablets. Applications and necessary data are provided and administered in Cloud Computing by Cloud server that becomes remotely available without any physical or time limit. These aspects predetermine Cloud Computing among others for effective application in teaching. This chapter presents the implementation of OpenStack Cloud Computing platform and the results of integration in the educational process.

High Level Models for IaaS Cloud Architectures

This paper explains how ontology can be used to model various IaaS architectures. OpenStack is the largest open source cloud computing IaaS platform. It has been gaining wide spread popularity among users as well as software and hardware vendors over past few years. It’s a very flexible system that can support a wide range of virtualization scenarios at scale. In our work we propose a formalization of OpenStack architectural model that can be automatically validated and provide suitable meta-data to configuration management tools. The OWL-DL based ontology defines service components and their relations and provides foundation for further reasoning. Model defined architectures can support simple all-in-one architecture as as well as large architectures with clustered service components to achieve High Availability.

Herding Algorithm in a Large Scale Multi-agent Simulation

This research is focused on creation of a herding algorithm suitable for a large map area which will be used in an agent-based simulation of an ancient Celtic society development. Algorithm is designed in order to find suitable place for grazing of animals in a satisfactory time on a map composed of more than 700 000 cells. Parameters of the algorithm are adjusted due to the results of a statistical research. Simulation is created in the AnyLogic multimethod simulation modeling tool. Virtualized server is used for experiments because of a complexity of the simulation.

The Comparison of Container Orchestrators

Nowadays, rapid scaling and growth of requirements is a very important dynamic which was bring by virtualization in past years. One of the newest technologies are containers, which are used as new version of virtualization. The main difference between containers and classical virtualization is resource consumption. The container virtualization shares system resources with host operating system. For containers, because there is a prerequisite for running many containers, manual work should be eliminated and orchestration is needed and very important for successful adoption of containers in environment. This paper compares most commonly used orchestrator for containers, which has been implemented and tested. There is a few orchestrators, and most used of them are part of this paper. These orchestrators include Docker Compose, Fleet, Docker Swarm, Apache Mesos, and Kubernetes.

Hardware Layer of Ambient Intelligence Environment Implementation

Ambient Intelligence is growing phenomena caused by advances of speed and size of computational hardware. It is possible to collect data from various sensors, devices or services and react to evaluated event and start the predefined process. These systems are closely connected with Cloud based services as they provide publicly available interface for management and visualization, computational and storage capabilities for forecasts and other advanced data processing to create ambient intelligence environment. The true ambient environments react to the presence of people and the sensors and actuators have become part of the environment.