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AWS Well-Architected Framework

The AWS Well-Architected Framework is AWS's design-review methodology: a six-pillar checklist used to evaluate and improve the architecture of cloud workloads. It's the structured axis along which AWS customer-case-study blog posts typically frame their architectural choices — and the implicit structure of many AWS product-team design decisions.

The six pillars

Pillar Core question
Operational Excellence "Run and monitor systems to deliver business value and continually improve supporting processes."
Security "Protect information, systems, and assets while delivering business value."
Reliability "A workload performs its intended function correctly and consistently when expected."
Performance Efficiency "Use computing resources efficiently to meet requirements, and maintain efficiency as demand changes and technologies evolve."
Cost Optimization "Avoid unnecessary costs."
Sustainability Minimise environmental impact of running cloud workloads.

(Sustainability was added as the sixth pillar in 2021; earlier ingested sources reference the original five.)

Why it shows up on this wiki

Three load-bearing uses:

1. As the organising structure of AWS customer-case-study posts

Generali Malaysia's adoption-of-EKS post explicitly maps each architectural choice to one or more pillars:

  • EKS Auto Mode → Operational Excellence + Reliability + Performance Efficiency.
  • GuardDuty / Inspector / Network Firewall / Secrets Manager + ESO → Security.
  • Cost-allocation tags + Savings Plans → Cost Optimization.
  • Amazon Managed Grafana → Operational Excellence (observability).

This six-pillar-frame-per-feature structure is typical of AWS Architecture Blog case studies.

2. As a workload-review primitive that tenant-isolation choices short-circuit

The ProGlove 6,000-accounts post makes the counterpoint: when account-per-tenant isolation is the architecture, many Well-Architected pillar items "didn't even apply because isolation is structural" — the AWS account boundary itself short-circuits whole classes of Security / Operational Excellence review items.

This is the connection between "what isolation substrate did you choose?" and "how much of a Well-Architected review do you still need to do?": structural guarantees at lower layers reduce the surface area of higher-layer reviews.

3. As the underlying design standard for AWS services

AWS's own service designs are reviewed against the same framework — the pillars are both customer-guidance and internal-design criteria.

Sustainability is the newest pillar

Sustainability became the 6th pillar in December 2021, after the original five. It's framed by Generali as "sustainable practices that minimize their environmental impact while maintaining high performance and reliability" — in practice, right-sizing (via EKS Auto Mode) and avoiding over-provisioning are the two operational levers that move both Sustainability and Cost Optimization together.

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