AWS License Manager
A service that tracks and manages software license usage, reducing license violation risk and enabling cost optimization
Overview
AWS License Manager is a service that centrally manages the usage of commercial software licenses from Microsoft, Oracle, SAP, and others across both AWS and on-premises environments. By defining license rules and automatically enforcing license count limits when launching EC2 instances, it prevents unintended license overages. It supports vendor-specific license metrics including vCPU count, instance count, and socket count, with usage visualized in dashboards. It also manages licenses purchased through AWS Marketplace and tracks BYOL (Bring Your Own License) licenses, strengthening audit preparedness. Available at no additional charge.
License Configuration and Rule Definition
In License Manager, you create License Configurations to define license types and limits. Four count types are available - vCPU, Instance, Core, and Socket - configured to match the vendor's licensing model. For example, since Oracle Database licenses are based on physical core count, you select core counting and set limits accounting for the hyperthreading coefficient (0.5 for Oracle). Enabling hard limits blocks new instance launches when the license limit is reached, physically preventing unintended overages. Soft limits allow overages while notifying via CloudWatch alarms. The AMI association feature automatically applies license counting to instances launched from specific AMIs, eliminating manual tracking. Integration with Organizations enables sharing license pools across the organization, flexibly managing license allocation between accounts.
BYOL Management and Dedicated Hosts Integration
License Manager is particularly powerful in BYOL scenarios. When you already own Windows Server or SQL Server licenses, you can run BYOL instances on Dedicated Hosts with License Manager automatically managing host allocation and license consumption. The Host Resource Groups feature lets License Manager automatically select placement Dedicated Hosts for instances, maximizing host utilization. When no capacity is available, new hosts are automatically allocated, and unnecessary hosts are automatically released. This eliminates the complexity of manual Dedicated Hosts management while optimizing license costs. For SQL Server, Standard Edition requires per-physical-core licensing, making it important to accurately understand the relationship between instance sizes and host core counts. Visualizing per-host core utilization in the License Manager dashboard and identifying hosts with low license efficiency for consolidation is a recommended operational practice.
License Audit Response and Compliance Reporting
Software vendor license audits represent significant risk for many organizations. License Manager continuously collects audit-ready data and provides reporting capabilities. Usage reports include consumption counts per license configuration, peak usage, and time-series trends, enabling precise proof of "when, on which instance, how many licenses were in use" during audits. Integration with Systems Manager Inventory enables automatic collection of installed software lists, detecting unmanaged software installations. Cross-account license usage is aggregated at the Organizations level, providing a single view of organization-wide compliance status. In practice, generating quarterly license usage reports and checking discrepancies between purchased license counts and actual usage is effective. Surplus licenses found become negotiation leverage at contract renewal, while shortfalls found enable additional purchases before audit to avoid penalty risk.