AWS Beanstalk, how to reboot (or terminate) automatically an instance that is not responding

user_316700 0
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I have my Beanstalk environment with a "Scaling Trigger" using "CPUUtilization" and it works well.

The problem is that I can not combine this with a system that automatically reboots (or terminate) instances that have been considered "OutOfService" for a certain amount of time.

Into the "Scaling > Scaling Trigger > Trigger measurement" there is the option of "UnHealthyHostCount". But this won't solve my problem optimally, because it will create new instances as far there is one unhealthy, this will provoque my environment to grow until the limit without a real reason. Also, I can not combine 2 "Trigger measurements" and I need the CPU one.

The problem becomes crucial when there is only one instance in the environment, and it becomes OutOfService. The whole environment dies, the Trigger measurement is never triggered.

elastic-load-balancer amazon-elastic-beanstalk amazon-web-services
4 Answers

If you use Classic Load Balancer in your Elastic Beanstalk.

You can go to EC2 -> Auto Scaling Groups.

Then change the Health Check Type of the load balancer from EC2 to ELB.

By doing this, your instances of the Elastic Beanstalk will be terminated once they are not responding. A new instance will be created to replace the terminated instance.

user_14083470

If you want Auto Scaling to replace instances whose application has stopped responding, you can use a configuration file to configure the Auto Scaling group to use Elastic Load Balancing health checks. The following example sets the group to use the load balancer's health checks, in addition to the Amazon EC2 status check, to determine an instance's health.

Example .ebextensions/autoscaling.config

Resources:
  AWSEBAutoScalingGroup:
    Type: "AWS::AutoScaling::AutoScalingGroup"
    Properties:
      HealthCheckType: ELB
      HealthCheckGracePeriod: 300

See: https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/environmentconfig-autoscaling-healthchecktype.html

user_20508330
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