aws-troubleshoot
Troubleshoot AWS services using the AWS CLI. Focus on EKS, S3, ECR, EC2, SSM, networking, site-to-site VPNs, IAM Identity Center, and IAM.
What this skill does
# AWS Troubleshooting Skill ## General Guidance Use **AWS CLI commands** for all AWS service interactions, logs, metrics, and audit events. **Important**: When constructing AWS CLI commands, always append `--profile <profile-name>` to the end of the command if a specific AWS profile is needed. This ensures commands can be easily added to auto-allow lists with wildcard prefixes. Example: `aws s3 ls s3://my-bucket --profile production` All investigations should: 1. Scope log queries by log group and time window 2. Check CloudTrail for failed API calls 3. Use service-specific metrics before guessing 4. Recommend minimal corrections --- ## Core Services Covered ### EKS Common issues: - Image pull errors - Pod pending (CNI/IP exhaustion) - CrashLoopBackOff - Node NotReady Investigations: - Query pod logs - Query pod events - Inspect node status and cluster metrics ### S3 Common issues: - AccessDenied - Incorrect KMS key - BlockPublicAccess conflicts Investigations: - Query S3 server access logs - Inspect CloudTrail for denied events ### ECR Common issues: - Token expiration - Missing permissions - Architecture mismatch Investigations: - Search CloudTrail for `ecr:*` denied actions - Inspect repository push/pull failures ### EC2 Common issues: - Failed instance boot - ENI/network issues - IMDSv2 access failures Investigations: - Check EC2 instance status checks - Inspect system logs and VPC configuration ### SSM (Systems Manager) Common issues: - Agent not running - Missing IAM permissions - Instance not registered - Command execution failures Investigations: - Check SSM agent status on instances - Query command execution history - Inspect CloudTrail for SSM API failures - Validate instance profile permissions ### Networking & VPN Common issues: - Route mismatches - NACL/Security Group blocks - VPN tunnel down Investigations: - Query CloudWatch metrics for VPN TunnelState - Validate routing tables and security groups ### IAM Identity Center (SSO) Common issues: - User not assigned - Permission set mismatch Investigations: - Inspect activity logs for SSO authentication issues - Validate permission sets ### IAM Common issues: - AccessDenied - Incorrect role assumption Investigations: - Query CloudTrail for denied API events - Identify missing permissions --- ## Workflow 1. Identify service 2. Query scoped logs 3. Query CloudTrail for denied API calls 4. Query metrics when relevant 5. Diagnose using AWS-specific heuristics 6. Provide safe remediation steps
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