Introduction
Security in the cloud starts with identity. OCI’s Identity and Access Management (IAM) gives you fine-grained control over who can access what, ensuring the principle of least privilege across users, groups, and resources.
Core Concepts
OCI IAM consists of five main building blocks:
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Users – individual accounts
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Groups – collections of users with shared permissions
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Dynamic Groups – automatic identity for compute instances
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Policies – written rules that define permissions
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Compartments – logical containers for isolating resources
Sample Policy Examples
Grant a group full control over a compartment:
Grant read-only access:
Grant a compute instance permission to read Object Storage:
Best Practices
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Avoid using the root user for daily tasks
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Create a “Security Admin” group to manage IAM
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Use compartments for isolation between environments (dev, test, prod)
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Enable Multi-Factor Authentication (MFA) for all admin users
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Audit all IAM activity using Cloud Guard
Conclusion
OCI IAM provides enterprise-grade control with human simplicity. When configured properly, it ensures your environment stays secure, compliant, and well-organized.
