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IMPLÉMENTATION D’UNE SOLUTION
DE DISTRIBUTION DE CHARGES
Réalisé par : LOGHMARI Dhiaeddine & LATIRI Wael
Encadré par : Mme LAHAMI Mariem
1
Problématiques
SURCHARGE !
• Lourdeur du traitement à travers un serveur.
• Un seul serveur n’est pas assez pour un traitement
important.
• Un seul serveur n’est pas assez pour plusieurs clients.
• Tout le monde veut passer le premier sur un serveur.
2
3
Une meilleure solution:
Load Balancer
4
5
Plan
I. Répartition de charge (load balancing).
II. Load Balancer.
III. Comment ça marche.
IV. Avantages du load balancing.
V. Implémentation d’un load balancer.
6
Répartition de charge
• Equilibrage de charge / Load Balancing
• Distribuer une tâche à un pool de machines ou de
périphériques.
• Répartition de la base de donnée sur plusieurs
serveurs.
7
Load Balancer
• Distribution de charge entre plusieurs serveurs.
• Peut être matériel et logiciel.
• Tout trafic entrant ou sortant est dirigé vers lui.
8
Load Balancer
SCALABILITÉ
9
10
Comment ca marche
11
Comment ca marche
12
Comment ca marche
13
Comment ca marche
14
Avantages
Failover facile:
Si une machine tombe en
panne, toute la logique de
basculement réside dans
l'équilibreur de charge qui
gère automatiquement la
redistribution
15
Avantages
L'ajout de nœuds est
assez facile aussi
16
Implémentation d’un exemple
• Un exemple de K clients qui demandent aux
serveurs les résultats des opérations
d’addition.
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Algorithme du loadbalancer
TantQue (VRAI){
Ecouter(clients); // asynchrone
clients.PourChaque(client){
lire(client.donnée)
serveur=RoundRobin();
Envoyer(serveur,donnée);
}
Ecouter(serveurs); // asynchrone
serveurs.PourChaque(serveur)
{
repondre(donnée); //info client inclus
}
}
23
MERCI POUR VOTRE ATTENTION
24

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Loadbalancer - Distribution de charges

Editor's Notes

  1. Notions de pool = groupe d’un serveur