Monitor Auto Scaling instances with impaired Amazon EBS volumes using health checks
You can turn on the Amazon EBS health checks for your Auto Scaling group to make sure that Amazon EC2 Auto Scaling
monitors the entire system on which your application runs.
After you turn on these health checks, Amazon EC2 Auto Scaling receives the results of the Amazon EC2
status checks performed on an instance's attached EBS volumes. If a volume is not
reachable or does not pass I/O status checks, the health check will fail, and the
corresponding instance will be considered unhealthy. When Amazon EC2 Auto Scaling detects an unhealthy
instance, it replaces it.
This topic assumes you're familiar with the attached EBS status checks. If you're not,
see the Attached EBS status checks section of the
Amazon EC2 User Guide for details. The following topic describes how
to turn on the Amazon EC2 Auto Scaling health checks that rely on the attached EBS status
checks.
Turn on the Amazon EBS health checks for a
group
You can turn on the Amazon EBS health checks for new and existing Auto Scaling groups.
- Console
-
Turning on Amazon EBS health checks for a new group
When you create the Auto Scaling group, on the Configure
advanced options page, for Health
checks, Additional health check
types, select Turn on Amazon EBS health
checks. Then, for Health check grace
period, enter the amount of time, in seconds. This
amount of time is how long Amazon EC2 Auto Scaling must wait before checking the
health status of an instance after it enters the
InService state. For more information, see Set the health check grace period for an
Auto Scaling group.
- AWS CLI
-
Turning on Amazon EBS health checks for a new group
Add the --health-check-type option to the create-auto-scaling-group command. The following
example specifies EBS--health-check-type option for a new Auto Scaling group
named my-asg
aws autoscaling create-auto-scaling-group --auto-scaling-group-name my-asg \
--health-check-type "EBS" --health-check-grace-period 60 ...
You can specify multiple values for the
--health-check-type option. For example, to add both
Amazon EBS and Elastic Load Balancing health checks types, use the following command.
aws autoscaling create-auto-scaling-group --auto-scaling-group-name my-asg \
--health-check-type "EBS,ELB" --health-check-grace-period 60 ...
Value names are case sensitive.
- Console
-
Turning on Amazon EBS health checks for an existing group
Open the Amazon EC2 console at
https://console.aws.amazon.com/ec2/, and choose Auto Scaling Groups from the navigation pane.
-
On the navigation bar at the top of the screen, choose the
AWS Region that you created your Auto Scaling group in.
-
Select the check box next to an existing group.
A split pane opens up in the bottom of the Auto
Scaling groups page.
-
On the Details tab, choose
Health checks,
Edit.
-
For Health checks, Additional
health check types, select Turn on
Amazon EBS health checks.
-
For Health check grace period, enter the
amount of time, in seconds. This amount of time is how long
Amazon EC2 Auto Scaling must wait before checking the health status of an
instance after it enters the InService state. For
more information, see Set the health check grace period for an
Auto Scaling group.
-
Choose Update.
- AWS CLI
-
Turning on Amazon EBS health checks for an existing group
Add the --health-check-type option to the update-auto-scaling-group command. The following
example specifies EBS--health-check-type option for an existing Auto Scaling
group named my-asg
aws autoscaling update-auto-scaling-group --auto-scaling-group-name my-asg \
--health-check-type "EBS" --health-check-grace-period 60
To use multiple health checks types, you can specify multiple values
(for example, EBS,ELB--health-check-type option.
Value names are case sensitive.
