Great question—this is a super common point of confusion when diving into AWS security and optimization tools. Let’s break down their core differences clearly, so you know when to use each:

Core Purpose & Target Users #

• AWS Trusted Advisor: Think of this as a general-purpose AWS "health check" for all types of AWS users (developers, admins, architects). It covers 5 broad categories: cost optimization, performance, security, fault tolerance, and service limits. It’s perfect for quick, high-level checks to catch obvious misconfigurations, waste, or gaps that might fly under the radar day-to-day.
• AWS Inspector: This is a specialized security vulnerability assessment tool built specifically for workloads running on EC2 instances and containerized environments (ECS/EKS). It’s aimed at security engineers, DevOps teams, and compliance professionals who need deep, automated scanning to find vulnerabilities in OS packages, network setups, and application dependencies.

Check Scope & Depth #

• Trusted Advisor: Runs broad, rule-based checks that apply to your entire AWS account. Examples include:
  • Are your S3 buckets accidentally publicly accessible?
  • Do you have unused Elastic IPs draining your budget?
  • Are your EC2 instances using outdated, less efficient instance types?
• Inspector: Dives deep into individual workloads with granular scans:
  • Network reachability checks: Identifies open ports that shouldn’t be exposed to the internet.
  • Vulnerability scans: Detects CVEs (Common Vulnerabilities and Exposures) in OS packages, runtime environments, and container images.
  • Compliance checks: Validates your setup against standards like CIS AWS Foundations Benchmark, PCI DSS, and HIPAA.

Automation & Scheduling #

• Trusted Advisor: Checks run periodically (usually daily) by default, and you can view results in the AWS Console. If you have a Business or Enterprise Support plan, you can set up alerts for new findings—but it’s not built for continuous, real-time monitoring.
• Inspector: Fully automatable and designed for ongoing vulnerability management. You can:
  • Schedule recurring scans on a cadence that works for you.
  • Enable continuous scanning for EC2 instances and containers to catch issues as they arise.
  • Integrate findings with AWS Security Hub, CloudWatch Alarms, or third-party ticketing tools to trigger remediation workflows automatically.

Integration with AWS Ecosystem #

• Trusted Advisor: Integrates primarily with AWS Support and Cost Explorer, with limited additional integration options.
• Inspector: Tight integration with the AWS security stack:
  • Sends findings to Security Hub for centralized security visibility across all your AWS services.
  • Works with AWS Systems Manager to automatically remediate certain vulnerabilities (like updating outdated packages).
  • Hooks into Amazon EventBridge to trigger custom actions when new critical findings are detected.

Pricing #

• Trusted Advisor: Basic checks are free for all AWS users. Advanced checks (more detailed security, cost, and performance insights) require a Business or Enterprise Support plan.
• Inspector: Charged based on the number of EC2 instances scanned, container images analyzed, and the type of scans (network vs. vulnerability). There’s a free tier for limited usage to get you started.

Quick Rule of Thumb #

Use Trusted Advisor for quick, account-wide health checks across multiple categories (cost, security, performance). Use Inspector for deep, continuous security vulnerability scanning of your individual workloads (EC2, containers) to meet compliance requirements or harden your applications.

内容的提问来源于stack exchange，提问作者user6514731