What problem does it solve? Amazon EFS file systems can fail to mount, deny access, or perform slowly for many different reasons, and finding the root cause requires checking security groups, IAM policies, NFS clients, KMS keys, and VPC DNS settings. This Skill provides a structured diagnostic workflow that classifies symptoms and walks through the exact AWS CLI commands needed to identify and fix each category of EFS issue. ## Core Features & Use Cases - Symptom-Based Classification: Maps common symptoms like "wrong fs type", connection timeouts, and "access denied by server" to six distinct root-cause categories covering NFS clients, network, IAM, performance, encryption, and DNS. - Guided Remediation Commands: Provides ready-to-run AWS CLI and Linux commands for verifying mount targets, fixing security group rules on port 2049, checking burst credit balances, and switching throughput modes. - Use Case: An EC2 instance hangs for two minutes and then fails when mounting an EFS file system. The Skill classifies this as a network/security group issue, checks that the mount target's security group allows inbound TCP 2049 from the instance's security group, and applies the ingress rule fix. ## Quick Start Ask the assistant to troubleshoot why your EFS file system fs-12345678 is timing out when mounting from your EC2 instance in us-east-1.
