AWS Failure: Elastic load balancer disruption (ELB) caused a partial service disruption in a specific region. The issue caused traffic routing failures, preventing applications from effectively balancing requests.
Reason for AWS ELB Partial Service Disruption:
Increased Traffic or Load: Sudden surges in requests can overwhelm the load balancer or backend instances.
Misconfigured Health Checks: Incorrect settings can cause healthy instances to be marked as unhealthy.
Control Plane Issues: Problems with AWS’s underlying infrastructure can impair ELB’s ability to manage traffic.
Dependency Failures: Service Outages like Route 53 or network infrastructure might impact ELB performance.
Troubleshooting Steps:
Step 1. Verify EBS Volume Status:
Check the status in the AWS Management Console or use the CLI:
Step 2. Detach and Reattach Volumes:
- Stop the affected instance.
- Detach the EBS volume:
- Reattach it to a healthy instance to inspect data.
Step 3. Inspect System Logs:
Look for application or OS log errors, accessible through the EC2 console or CloudWatch.
Step 4. Recover from Snapshot:
If the volume is unrecoverable, restore from the latest snapshot:
5. Utilize Multi-AZ Architectures:
RDS and other services with Multi-AZ configurations can automatically failover to healthy replicas.
6. Monitor AWS Service Health:
Follow the AWS Service Health Dashboard for updates during ongoing disruptions.
Xieles team is ready to help you with any AWS issues.