March 2025
Intermediate to advanced
612 pages
21h 8m
French
Content preview from Conception de systèmes sur AWS
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Chapitre 5. Approches et techniques d'équilibrage des charges
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Dans leur quête d'évolutivité et pour assurer une disponibilité ininterrompue des services, les organisations ont adopté des techniques de mise à l'échelle horizontale et verticale, comme nous l'avons vu au chapitre 1. Ces méthodes ont permis de relever certains défis en matière d'évolutivité, mais elles ne garantissent pas une disponibilité continue des services. La croissance rapide d'Internet et la nécessité pour les sites Web modernes à fort trafic de gérer des centaines de milliers de demandes simultanées nécessitent une approche plus robuste.
Lorsqu'un seul serveur est chargé de traiter toutes les demandes entrantes, il devient surchargé, ce qui peut entraîner des défaillances du système. Pour surmonter cette limitation, nous mettons le système à l'échelle horizontale. Ensuite, l'équilibrage de la charge entre en jeu pour distribuer efficacement le trafic réseau entrant sur le groupe de serveurs dorsaux, souvent appelé pool de serveurs. C'est un peu comme si tu créais une entreprise seul et que tu embauchais plus tard d'autres personnes (et que tu répartissais les tâches entre elles) pour faire évoluer l'entreprise.
Dans ce chapitre, nous commencerons par comprendre les différents composants de mise en réseau permettant de gérer le trafic et d'améliorer les performances. Nous nous ...
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