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Configurable Parallel Execution of System Tests within the Strimzi Project
Orsák, Maroš ; Rogalewicz, Adam (oponent) ; Češka, Milan (vedoucí práce)
In recent years, many companies have adopted Kubernetes and the microservices architec- ture it enables. This technology was opened up many new possibilities not just for large companies, but also for small software developers. Kubernetes is a container-orchestration system and recently a new concept has emerged arround how to orchestrate the containers more efficiently - the Operator pattern. One such operator is developed and maintained under an open-source project called Strimzi. The Strimzi project gathers together several tools, which take care of the deployment of Apache Kafka on Kubernetes. Since Kafka is a complex, horizontally scalable, distributed system, you can imagine that its installation is a relatively complex action. Therefore, one of the biggest challenges of using Kubernetes is how to effectively and quickly test projects such as Kafka and Strimzi and at the same time verify integration with other similar products. The resources needed by Kubernetes are much more demanding compared to the deployment of Kafka on virtual machines or typi- cal container instances. To tackle this problem, we adopt the principles of parallel execution and created a mechanism within Strimzi system tests, which runs tests in parallel against only a single Kubernetes cluster. Furthermore, we proposed a brand new architecture for the end-to-end tests. The improvements aim at scalability and reduction of execution time . Through several experiments, this paper shows that proposed mechanism with different configurations of the Kubernetes cluster (including number of Kubernetes nodes , number of tests and suites executed in parallel ) significantly accelerated execution of the tests.
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Knihovna pro práci se senzory umožňujícími distribuované výpočty v jazyce FORTH
Kudela, Kryštof ; Valach, Soběslav (oponent) ; Jirgl, Miroslav (vedoucí práce)
Tato bakalářská práce se věnuje programovacímu jazyku Forth, variantám operačních systémů Forth, rozboru mikrokontrolérů, definici chytrých senzorů a distribuovaným systémům a výpočtům. Cílem je čtenáře uvést do celé vývojové platformy Forth, kde se nejprve naučí ve Forthu programovat, poté se dozví o operačních systémech FlashForth a AmForth. V kapitole MCU je popsán jednočipový počítač, jeho rozdělení a použití. Následuje kapitola s definicí chytrých senzorů. Poté teoretický úvod do distribuovaných systémů a výpočtů, na něž navazuje řešení multitaskingu ve Forthu. V jazyce Forth je vytvořena síť, která umožňuje vzdálené ovládání za pomocí bezdrátového modulu.
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Dynamic Software Architectures for Distributed Embedded Control Systems
Richta, Tomáš ; Kavička, Antonín (oponent) ; Sawa, Zdeněk (oponent) ; Janoušek, Vladimír (vedoucí práce)
This thesis deals with dynamic reconfigurability of distributed control systems. Due to the characteristics of these systems, the Petri nets formalism is used to define their functionality. These are transformed into a interpretable form and then executed by specialized software installed on each system node. Thanks to the properties of used formalism, it is possible to replace the individual parts of the system with new variants. Similarly, it is possible to generate formal specifications for the system's parts from more abstract workflow models and descriptions in the form of domain specific languages.
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Biometric System Security Using Blockchain Technology
Žiška, Marek ; Drahanský, Martin (oponent) ; Malaník, Petr (vedoucí práce)
This work analyzes existing protocols used to reach consensus in blockchain technologies, describes the concepts of biometric systems, identifies their security threats, and presents existing solutions for securing the biometric systems. Based on these findings, designs a decentralized version of the biometric system that makes use of the weighted PBFT protocol and the blockchain to improve the security of feature extraction and matching module of the classical biometric system. Blockchain is characterized as a system of recording information that assures immutability. The direct use of blockchain to secure sensitive data, such as biometric data, is not expected to be the most appropriate use, but its integration within the processes of individual components of biometric systems appears to be a good option. The proposed system was implemented and tested with a variety of test scenarios. Evaluation has shown that our design managed to mitigate direct attacks on the focused components and attacks on the channels that connect them together and the channel that connects the matcher to the external application.
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Chaos Testing of the Strimzi Project Using the Litmus Platform
Zrnčík, Henrich ; Smrčka, Aleš (oponent) ; Vojnar, Tomáš (vedoucí práce)
The last decade in software engineering has seen a trend towards automation and abstraction with increasing use of micro-service architecture. The trend towards micro-service architecture has brought with it a need to rethink how we implement software quality assurance. Running micro-services in the cloud with multiple distributed components requires additional management of shared and inter dependent components. This in turn requires additional testing of the system's resilience. A possible answer is chaos engineering, which is often considered the next logical step after end-to-end and integration testing. This thesis will focus on the gaps in testing created by the move to micro-service architecture and how chaos engineering can fill them. In particular it will focus on Apache Kafka deployed onto a kubernetes platform (Strimzi) and how the Litmus framework can be used to implement Chaos testing against this deployment. As our use-case was to have long running Kafkas deployed on kubernetes we had to adapt and extend the Litmus framework and build experiments that could test both long running kafkas and long running kubernetes. This thesis will demonstrate how we did this.
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Configurable Parallel Execution of System Tests within the Strimzi Project
Orsák, Maroš ; Rogalewicz, Adam (oponent) ; Češka, Milan (vedoucí práce)
In recent years, many companies have adopted Kubernetes and the microservices architec- ture it enables. This technology was opened up many new possibilities not just for large companies, but also for small software developers. Kubernetes is a container-orchestration system and recently a new concept has emerged arround how to orchestrate the containers more efficiently - the Operator pattern. One such operator is developed and maintained under an open-source project called Strimzi. The Strimzi project gathers together several tools, which take care of the deployment of Apache Kafka on Kubernetes. Since Kafka is a complex, horizontally scalable, distributed system, you can imagine that its installation is a relatively complex action. Therefore, one of the biggest challenges of using Kubernetes is how to effectively and quickly test projects such as Kafka and Strimzi and at the same time verify integration with other similar products. The resources needed by Kubernetes are much more demanding compared to the deployment of Kafka on virtual machines or typi- cal container instances. To tackle this problem, we adopt the principles of parallel execution and created a mechanism within Strimzi system tests, which runs tests in parallel against only a single Kubernetes cluster. Furthermore, we proposed a brand new architecture for the end-to-end tests. The improvements aim at scalability and reduction of execution time . Through several experiments, this paper shows that proposed mechanism with different configurations of the Kubernetes cluster (including number of Kubernetes nodes , number of tests and suites executed in parallel ) significantly accelerated execution of the tests.
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Application for Demonstration of Synchronization Mechanisms in Distributed Systems
Klimčíková, Lenka ; Veigend, Petr (oponent) ; Zbořil, František (vedoucí práce)
The aim of this thesis is to design and create a web application for the demonstration of selected synchronization mechanisms in distributed systems. The algorithms communicate by means of message-passing to ensure mutual exclusion of the processes in an effort to access the critical section. Implemented are Lamport's algorithm, Maekawa's algorithm, Raymond's algorithm and Suzuki-Kasami broadcasting algorithm. The application is implemented in Java programming language with the use of Spring Boot framework for listening on different endpoints. Thymeleaf template engine is used to exchange the necessary data between backend and frontend of the application. HTML + JavaScript language are used for dynamic rendering of sent messages to the screen. The algorithms are implemented in separate libraries, which are then used by the web application. The application illustratively demonstrates function of each algorithm with loads of different examples for the best possible understanding. It's primarily intended for students of Faculty of Information Technology, Brno University of Technology
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Dynamic reconfiguration in SOFA 2 component system
Babka, David ; Bureš, Tomáš (vedoucí práce) ; Pop, Tomáš (oponent)
SOFA2 je komponentový systém založený na vytváření a uchovávání komponent v distribuovaném prostředí. Tento systém podporuje komponentovou hierarchii, což znamená, že lze několik komponent sloučit do jedné komponenty. Součástí tohoto systému jsou koncepty, které popisují návrh možných dynamických rekonfigurací architektury, které jsou nezbytné pro běh jakékoliv reálné složitější aplikace. Tyto koncepty jsou výjimečné hlavně tím, že návrh jednotlivých dynamických rekonfigurací je vytvářen už v době návrhu architektury aplikace a tedy se jimi běh aplikace musí řídit. Tyto dynamické rekonfigurace spočívají ve vytváření/ničení dynamických komponent a vytváření/ničení propojení mezi jednotlivými komponentami, díky čemuž se aplikace mohou lépe adaptovat nově vzniklým situacím. Cílem této teze je ověřit návrh těchto konceptů pomocí implementace prototypu pro SOFA2 a ověřit jejich korektnost a použitelnost na testovacích aplikacích.
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SOFAnet 2
Papež, Michal ; Bureš, Tomáš (vedoucí práce) ; Malohlava, Michal (oponent)
SOFAnet 2 DIPLOMOVÁ PRÁCE Michal Papež Katedra distribuovaných a spolehlivých systémů, 2011 Abstrakt: Cílem SOFAnet 2 jakožto síťového prostředí komponentového systému SOFA 2 je jednoduchá a rozumná výměna komponent mezi jednotlivými uzly. Sou- časné požadavky uživatelů SOFA 2 na distribuci software jsou analyzovány a disku- továny. Protože koncepty SOFA 2 nejsou navrženy pro účely distribuce, byly zave- deny nové koncepty pro aplikace a komponenty. Tyto nové koncepty jsou mapovány na koncepty SOFA 2 a studovány na formálním množinovém modelu. Pomocí to- hoto modelu jsou definovány operace pro distribuci, instalaci a odstranění aplikací i komponent. Jsou také navržena pravidla, podle kterých je možné vyčistit repoz- itář SOFA 2 od nepotřebných částí software. Koncept SOFAnetu 2 je ověřen na prototypové implementaci. 1
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Monitoring DNS serverů domén druhé úrovně
Šťastný, Petr ; Peterka, Jiří (vedoucí práce) ; Lukeš, Dan (oponent)
Tato práce přímo navazuje na bakalářskou práci. Nejprve uvádí veškerou potřebnou teorii o protokolech HTTP, SMTP a dalších, která je následně využita k sestavení metodiky rozšiřujících testů, které ověřují dostupnost a funkčnost základních internetových služeb domén. Metodika je následně implementována jako aplikace, která s využitím distribuovaného zpracování umožňuje automatizovaně analyzovat velké množství domén. Ze získaných výsledků jsou následně sestaveny statistické výstupy. Jedna kapitola je též věnována přehledu útoků na DNS a možnostmi zabezpečení DNS serverů a záznamů domén.
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