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ELB & ASG

Auto Scaling Groups and Elastic Load Balancers

QuestionAnswer
Define Scalability including the two types Scalability = ability of an application to respond to variable load Vertical scalability = variable strength of hardware e.g. bigger instance types Horizontal scalability = variable volume of hardware e.g. more or less of a given instance type
Define Availability Availability = resilience of an application in the face of disaster e.g. server destruction
Define Agility Agility = distractor; the ease with which cloud computing resources can be accessed by a professional compared to the overheads of setting up inhouse infrastructure
What is an Elastic Load Balancer and what are the benefits? A managed service from AWS that groups EC2 instances together Benefits: One end point for an application Spreads load across resources Direct load away from poorly performing instances Perform health checks and automatically reboot instances
What are the three types of ELB? Application Load Balancer Network Load Balancer Gateway Load Balancer
Describe the three main auto-scaling strategies Manual Dynamic - scheduled, performance target tracking, demand steps Predictive - using ML
What is an Auto Scaling Group? - Automatically horizontally scale the number of EC2 instances provisioning an application, to match demand - Positive financial and environmental impact - Automatic registration with a load balancer - Capable of rebooting unhealthy instances
What is an ALB? Application Load Balancer - HTTP/HTTPS - single URL endpoint (Static DNS) - layer 7
What is an NLB? Network Load Balancer - UDP/TCS - high performance, low latency (millions of requests per second) - Layer 4 - Single IP address end point
What is a GWLB? Gateway Load Balancer - GENEVE protocol on IP packets - For directing requests to a third party firewall before routing to application - Deep packet inspection - Intrusion detection - Layer 3
Created by: katejimh
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