Reviewed by Aditya Kumar · Last reviewed 2026-03-24
Architectural difference: Service Principal = app identity; client ID, tenant, secret/certificate; for automation, CI/CD, third-party. Managed Identity = Azure-managed; no secrets; tied to resource (VM, ADF, Function). System-assigned vs user-assigned. When: Managed Identity for...
Architectural difference: Service Principal = app identity; client ID, tenant, secret/certificate; for automation, CI/CD, third-party. Managed Identity = Azure-managed; no secrets; tied to resource (VM, ADF, Function). System-assigned vs user-assigned. When: Managed Identity for Azure resources—simpler, no secret rotation. Service Principal for external, non-Azure, Terraform. Best practice: Prefer Managed Identity; rotate SP secrets.
Red Flag: Using SP when Managed Identity available. Pro-Move: 'ADF and Synapse use Managed Identity for Blob—zero secrets; Terraform uses SP with rotated cert.'
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