Overview Configure & Deploy Sources & Documentation Related Items. AUTO SCALING: Auto Scaling increases or decreases the no. When using ELB health check, the Auto Scaling Group will rely on the ELB health check to determine if an instance is healthy or not. 13. The health check is carried out by performing a ping using a specified protocol to the instance. Read this fantastic primer on how elastic load balancers and EC2 auto-scaling will support your AWS workloads. So by selecting that load balancer we have now associated that ELB with this auto scaling group. If a health check fails for an instance, then that instance is automatically removed from the ELB. One of the instance health check returns the status as Impaired to Auto Scaling. By default, your Auto Scaling group determines the health state of each instance by periodically checking the results of Amazon EC2 instance status checks. We can have auto scaling across AZs in single and same region. And there's a health check grace period here of 300 seconds, which is the length of time that auto scaling waits before checking in the instance's health. ; When you create a load balancer, you must specify one public subnet from at least two Availability Zones. Similarly if you have attached an ELB to that auto scaling group, then it will also distribute the traffic across Azs. Are you sure the ELB health check is correctly configured? 14. Outputs: elb_dns_name = terraform-asg-example-2472445669.ap-south-1.elb.amazonaws.com instance_ids = [52.66.14.13] The ELB is routing traffic to your EC2 Instances. ... We can now combine the ELB with Auto scaling. It looks like the ELB health check is failing, which causes the ASG to terminate the instance and launch a new one. AWS Elastic Load Balancing (ELB) Distributes incoming application or network traffic across multiple targets, such as EC2 instances, containers (ECS), Lambda functions, and IP addresses, in multiple Availability Zones. Auto Scaling groups use health checks to keep up with the group configuration defined. ELB Health Checks are Configured for Auto Scaling Groups. of available instances as per the scaling policy mentioned, to manage the instances both in peak and off-peak hours. B. Terminate the instance and launch a new instance. What will Auto Scaling do in this scenario? It looks you are checking port 22. C. A. Hence the role of ELB is to just distribute the Traffic, check the health of instance and make sure that every request is connected to appropriate target groups. For example, performing a ping over port 80 to the /index.html file on the web servers. EC2 status checks are default for Auto Scaling, if an instance fails these status checks, Auto scaling considers instance unhealthy and replaces it. A Config rule that checks whether your Auto Scaling groups that are associated with a load balancer are using Elastic Load Balancing health … Overview. 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