(AWS Academy) Module 10 - Auto Scaling and Monitoring
What is AWS EC2 auto scaling?
Amazon EC2 Auto Scaling is an AWS service that helps you maintain application availability and enables you to automatically add or remove EC2 instances according to conditions you define. You can add or remove EC2 instances manually, on a schedule, in response to changing demand, or in combination with AWS Auto Scaling for predictive scaling. Dynamic scaling and predictive scaling can be used together to scale faster
What are the three types of Elastic Load Balancers offered by AWS?
- application load balancer - network load balancer - classic load balancer
What are the six major use cases described by AWS for using load balancing?
- highly available and fault tolerant applications - ease of orchestration of containerized apps - automatically scale your applications - use in your virtual private cloud - enable hybrid load balancing - invoke lambda functions over HTTP(s)
What are the major characteristics of an classic load balancer?
A Classic Load Balancer provides basic load balancing across multiple EC2 instances, and it operates at both the application level and network transport level. A Classic Load Balancer supports the load balancing of applications that use HTTP, HTTPS, TCP, and SSL. The Classic Load Balancer is an older implementation. When possible, AWS recommends that you use a dedicated Application Load Balancer or Network Load Balancer.
What are the major characteristics of an network load balancer?
A Network Load Balancer operates at the network transport level (OSI model layer 4), routing connections to targets—EC2 instances, microservices, and containers—based on IP protocol data. It works well for load balancing both Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) traffic.
What is AWS auto scaling?
AWS Auto Scaling is a separate service that monitors your applications. It automatically adjusts capacity to maintain steady, predictable performance at the lowest possible cost. The service provides a simple, powerful user interface that enables you to build scaling plans for AWS resources
What is it called when you trigger a notification based off of a cloud watch event or metric?
Alarm
What is AWS Cloud Watch?
Amazon CloudWatch is a monitoring and observability service that is built for DevOps engineers, developers, site reliability engineers (SRE), and IT managers. CloudWatch monitors your AWS resources (and the applications that you run on AWS) in real time. You can use CloudWatch to collect and track metrics, which are variables that you can measure for your resources and applications.
What are the major characteristics of an application load balancer?
An Application Load Balancer operates at the application level (Open Systems Interconnection, or OSI, model layer 7). It routes traffic to targets— Amazon Elastic Compute Cloud (Amazon EC2) instances, containers, Internet Protocol (IP) addresses, and Lambda functions—based on the content of the request
What is an auto scaling group?
An Auto Scaling group is a collection of Amazon EC2 instances that are treated as a logical grouping for the purposes of automatic scaling and management. The size of an Auto Scaling group depends on the number of instances you set as the desired capacity. You can adjust its size to meet demand, either manually or by using automatic scaling.
What is an Elastic Load Balancer?
Elastic Load Balancing is an AWS service that distributes incoming application or network traffic across multiple targets—such as Amazon Elastic Compute Cloud (Amazon EC2) instances, containers, internet protocol (IP) addresses, and Lambda functions—in a single Availability Zone or across multiple Availability Zones.
What is a listener in the context of a load balancer?
You configure your load balancer to accept incoming traffic by specifying one or more listeners. A listener is a process that checks for connection requests. It is configured with a protocol and port number for connections from clients to the load balancer. Similarly, it is configured with a protocol and port number for connections from the load balancer to the targets.
