2-1-4 IAM Dynamic Groups Explained
Key Concepts
- Dynamic Groups
- Matching Rules
- Policy Application
- Use Cases
1. Dynamic Groups
Dynamic Groups in Oracle Cloud Infrastructure (OCI) allow you to group cloud resources (such as compute instances, functions, or databases) based on specific criteria rather than manually adding them to a group. This simplifies the management of permissions and policies for resources.
Example: Instead of manually adding each compute instance to a group, you can create a dynamic group that includes all instances with a specific tag, such as "environment=production".
2. Matching Rules
Matching Rules define the criteria used to include resources in a dynamic group. These rules are written in a specific syntax and can match resources based on attributes like tags, compartments, or resource types.
Example: A matching rule could be "resource.compartment.id = 'ocid1.compartment.oc1..exampleuniqueid'" to include all resources in a specific compartment.
3. Policy Application
Once resources are included in a dynamic group, policies can be applied to the group as a whole. This allows you to manage permissions for multiple resources at once, reducing the need for individual policy assignments.
Example: A policy could allow all instances in the dynamic group to access a specific Object Storage bucket. The policy statement might be: "Allow dynamic-group production-instances to manage object-family in compartment production-data".
4. Use Cases
Dynamic Groups are particularly useful in scenarios where resources are frequently created or destroyed, or when managing large numbers of resources. They help maintain consistent permissions and simplify policy management.
Example: In a DevOps environment, where new compute instances are regularly provisioned, dynamic groups can automatically include these instances in the appropriate groups based on their tags, ensuring they have the necessary permissions without manual intervention.
By understanding and implementing Dynamic Groups, you can efficiently manage permissions for large and dynamic sets of resources in Oracle Cloud Infrastructure, enhancing security and simplifying administration.