आधारभूत IAM भन्दा परे, roles (assumed identities), policy types र evaluation (कसरी permissions निर्धारण गरिन्छ), र cross-account access र service roles जस्ता patterns बुझ्नु सुरक्षित, राम्रो-आर्किटेक्चर गरिएको AWS access management को लागि महत्त्वपूर्ण छ।
Roles गहिराइमा — कसले के assume गर्छ
A ROLE has TWO key policies:
TRUST POLICY → WHO can assume the role (which principals: a service, account, user)
PERMISSION POLICIES → WHAT the role can do once assumed
Use cases:
→ SERVICE roles — an EC2/Lambda assumes a role to access AWS (no embedded keys)
→ CROSS-ACCOUNT — account B's role trusts account A → A's users assume it (controlled access)
→ FEDERATION/SSO — external identities assume roles (temporary credentials)
→ Roles give TEMPORARY credentials (auto-rotated) — far safer than long-lived keys.
