Here's a structured summary and key takeaways from the information provided, focusing on AWS organizations for the SysOps exam:

Reserved Instances (RI) and Savings Plans Sharing

• Overview: Allows all accounts within an organization to access and utilize Reserved Instances and Savings Plans.
• Cost Savings: Designed to maximize cost efficiency across multiple accounts.
• Customization: Ability to disable sharing for specific accounts, including the payer account, to control cost benefits distribution.
• Requirement: For RI or Savings Plan discounts to be shared, both accounts must have sharing enabled.

IAM Policies with aws:PrincipalOrgID

• Purpose: Facilitates access management across the organization.
• Implementation: By using the aws:PrincipalOrgID condition in IAM policies, you grant access to IAM principals (users or roles) from all accounts within your organization.
• Use Case: Enables seamless access to resources like S3 buckets across the organization without specifying individual account IDs.

Tag Policies

• Functionality: Enforces standardized tagging practices within an organization.
• Benefits:
  • Assists in auditing and resource categorization.
  • Supports cost allocation tagging and attribute-based access controls.
• Compliance Monitoring: Offers mechanisms to identify and monitor non-compliant resources using CloudWatch Events.

Key Points

• Reserved Instances Sharing and Savings Plans are crucial for cost optimization across an AWS Organization.
• aws:PrincipalOrgID condition streamlines access management, enhancing operational efficiency.
• Tag Policies play a vital role in governance, compliance, and cost management by enforcing standardized tagging practices.

This summary encapsulates the main aspects of AWS organizations relevant to the SysOps exam, focusing on cost-saving mechanisms, access management, and governance through tagging.