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Cloud Computing Beginner

What is SLA (Service Level Agreement)?

A formal agreement between a service provider and customer defining guaranteed levels of service availability and performance.

SLAs specify measurable metrics like uptime percentage (99.9% = "three nines" = 8.76 hours downtime/year), response times, support availability, and remedies for violations (typically service credits).

Related concepts include SLO (Service Level Objective — internal target) and SLI (Service Level Indicator — actual measurement). Understanding SLAs is crucial for architecture decisions — achieving 99.99% requires fundamentally different design than 99.9%.

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Auto Scaling
Automatically adjusting the number of computing resources based on current demand to maintain performance and optimize costs.
Serverless Computing
A cloud execution model where the provider manages servers and dynamically allocates resources, charging only for actual usage.
IaaS (Infrastructure as a Service)
A cloud service model providing virtualized computing resources like servers, storage, and networking over the internet.
CloudFormation
An AWS service that provisions and manages cloud resources using declarative JSON or YAML templates.
Kubernetes Pod
The smallest deployable unit in Kubernetes, consisting of one or more containers that share storage, network, and lifecycle.
Cloud Function
A serverless compute service that runs code in response to events without requiring server management or infrastructure provisioning.
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