Ensure there are at least two healthy EC2 target instances registered to each Amazon Application Load Balancer (ALB) and Network Load Balancer (NLB) in order to provide a fault-tolerant load balancing configuration for your applications.
This rule can help you work with the AWS Well-Architected Framework.
This rule resolution is part of the Conformity Security & Compliance tool for AWS.
To achieve fault tolerance and minimize the risk of downtime, even if the load balancer is attached to an AWS Auto Scaling Group that has max and desired capacity set to 1, always register at least two target instances to the target group(s) associated with your ELBv2 load balancers.
To determine if your AWS ELBv2 load balancers distribute the traffic to at least two healthy target instances, perform the following actions:
Remediation / Resolution
To register additional healthy EC2 instances to the target group(s) associated with your ELBv2 load balancers, perform the following:
- AWS Documentation
- Elastic Load Balancing FAQs
- Application Load Balancers
- Network Load Balancers
- Target Groups for Your Application Load Balancers
- Register Targets with Your Target Group
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ELBv2 Minimum Number of EC2 Target Instances
Risk level: High