CloudTrail によるイベント駆動型監視

Welcome to the lesson on AWS CloudTrail! This service is crucial for auditing, governance, and compliance within your AWS account.

Think of CloudTrail as a security camera for your AWS environment. It continuously monitors and records account activity.

CloudTrail captures a comprehensive history of events, including API calls, made by users, roles, or AWS services.

• Security Analysis: Detect unusual activity or unauthorized access.
• Compliance Auditing: Prove adherence to regulatory requirements.
• Troubleshooting: Pinpoint who made what change and when.
• Resource Change Tracking: Understand changes to your AWS resources.

CloudTrail logs events as JSON records. These records provide details like:

• Who made the request (user or role)
• What action was performed (e.g., RunInstances, PutObject)
• When the action occurred
• From which IP address
• Which AWS service was involved

CloudTrail categorizes events into two main types. Management events capture control plane operations on your AWS resources.

• Creating or deleting an EC2 instance.
• Configuring security groups.
• Updating an S3 bucket policy.

These events provide insight into management operations.

Data events log resource operations performed on or within a resource, which are often high-volume activities.

Examples include:

• S3 object-level API activity (GetObject, PutObject, DeleteObject).
• Lambda function invoke activities.

Data events can generate a lot of data and are optional to log.

Every AWS account automatically has Event History enabled, which provides a view of the past 90 days of management events in the CloudTrail console.

This is a quick way to search, view, and download recent activity without setting up a dedicated trail.

For long-term storage, advanced filtering, and integration with other services, you create a CloudTrail trail.

A trail is a configuration that enables CloudTrail to deliver log files to an Amazon S3 bucket you specify. You can create one trail that applies to all regions or specific regions.

When you create a trail, CloudTrail delivers log files to your chosen S3 bucket. These log files are encrypted and organized by region and date.

Storing logs in S3 provides durable, low-cost storage, which is ideal for compliance and long-term auditing requirements.

For real-time monitoring and alerting, CloudTrail can be configured to send events to Amazon CloudWatch Logs.

This integration allows you to:

• Create alarms based on specific API calls.
• Build dashboards to visualize activity patterns.
• Centralize logs from multiple AWS services.

Which of the following are key benefits of using AWS CloudTrail?

You've learned that AWS CloudTrail is essential for maintaining security, achieving compliance, and performing operational troubleshooting within your AWS account.

By logging management and data events to S3 and integrating with CloudWatch Logs, you gain deep visibility into all activities, ensuring you know who did what, when, and where.