Technology - Compute Services Flashcards
EC2
Elastic Compute Cloud. Allows to rent and manage virtual servers in the cloud, providing elastic compute power (scalable). E.g. deploying a database or a web application.
EC2 Instance
A virtual server running on a physical server in a data centre, provading scalable computing capacity in the cloud.
(Instances are not considered serverless.)
EC2 Access Methods
AWS Management Console (web browser)
Secure Shell (SSH; local machine)
EC2 Instance Connect (EIC; IAM policies control SSH access)
AWS System Manager (web browser or AWS CLI)
AMI
Amazon Machine Image. A template that contains the software configuration (ops system, app server and apps) required to launch an instance. E.g.: Amazon Linux, Ubuntu, Windows, Red Hat.
EC2 Features
- Elastic Load Balancing - automatically distributes incoming application traffic across multiple EC2 instances.
- EC2 Auto Scaling - adds or replaces EC2 instances automatically across AZs based on demand.
Horizontal Scaling vs Vertical Scaling
Horizontal Scaling (scaling out) - adding more EC2 instances; reduces the impact of system failures and improves the availability of applications.
Vertical Scaling (scaling up) - upgrade the existing EC2 instance by adding more compute power.
EC2 Pricing: On-Demand
A fixed price in which you are billed to the second based on instance type (pay-as-you-go).
- low cost without upfront payment
- unpredictable workloads that can’t be interrupted
- apps under development
- workloads run no longer than a year
EC2 Pricing: Spot
Take advantage of unused EC2 capacity. Request is fulfilled only if capacity is available.
- not concerned about start/stop
- workloads can be interrupted
- apps feasible at very low compute price
EC2 Pricing: Reserved Instances (RIs)
Commit to a specific instance type in a Region for 1or 3 years.
- steady state usage
- pay money upfront for highest discount
- apps require capacity reservation
EC2 Pricing: Dedicated Hosts
Pay for physical server that is fully dedicated to running your instances.
- bring your own server-bound software license
- regulatory or corporate compliance
EC2 Pricing: Savings Plans
Commit to compute usage, not a dedicated host, with no capacity reservation. Measured per hour, for 1 or 3 years.
- lower bill across multiple compute services
- flexibility to change compute services, instant types, ops systems or regions
Lambda
A serverless, event-driven compute service that lets you run code for virtually any type of application or backend service without provisioning or managing servers.
Use cases include: real-time file processing, sending email notifications, backend business logic
Lambda Features
- Supports popular programming languages.
- You can author code using dev environment or the console.
- Event-driven.
- 15 minutes timeout.
Lambda Pricing
- Compute time: pay only when the code is running.
- Request count: pay for a number of times the function is executed.
- Always free: 1 million free requests each month.
Fargate
A serverless, pay-as-you-go compute engine for containers (Docker) that scales automatically and lets you focus on building applications without managing servers.
Lightsail
Allows you to quickly launch all the resources you need for small projects. You can deploy preconfigured apps like WordPress websites at a low, predictable monthly fee.
Outposts
Allow you to extend and run native AWS services on premises in your internal data centre for a hybrid experience.
Batch
Allows you to process large workloads in smaller chunks (or batches). Efficiently run hundreds of thousands of batch and ML computing jobs while optimizing compute resources.
