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Udemy AWS SAA - Scalability & Availability

时间:2024-04-08 18:11:42浏览次数:19  
标签:load SAA AWS Scalability your instances balancer availability Availability

Scalability: an application / system can handle greater loads by adapting.
There are two kinds of scalability

  • Vertical Scalability (=scale up / down)
    • increasing the size of the instance, like better laptop, or from t2.micro to t2.large
  • Horizontal Scalability(= elasticity)(= scale out / in)
    • increasing the number of instances or systems for your application. This implies distributed systems
    • Auto Scaling Group
    • Load Balancer

Availability (= run instances for the same app across multi AZs)

  • High Availability usually goes hand inhand with horizontal scaling
  • High availability means running your application /system in at least 2 data centers (== vailability Zones)
  • The goal of high availability is to survive a data center loss
  • The high availability can be passive (forRDS Multi AZ for example)

Load balancing:
servers that forward traffic to multiple servers (ex. EC2 instances) downstream

Why use a load balancer?

  • Spread load across multiple downstream instances
  • Expose a single point of access (DNS) to your application
  • Seamlessly handle failures of downstream instances
  • Do regular health checks to your instances
  • Provide SSL termination (HTTPS) for your websites
  • Enforce stickiness with cookies
  • High availability across zones
  • Separate public traffic from private traffic

Elastic load balancer

  • a managed load balancer
  • cheaper that creating your own load balancer, and integrate with many AWS offerings

Health Checks

  • Crucial for load balancers
  • They enable the load balancer to know if instances it forwards traffic to are available to reply to requests
  • The health check is done on a port and a route (/health is common)
  • If the response is not 200 (OK), then the instance is unhealthy

标签:load,SAA,AWS,Scalability,your,instances,balancer,availability,Availability
From: https://www.cnblogs.com/miramira/p/18121794

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