CODEWITHSUNDEEP
amazon-web-servicesamazon-ec2aws-sdk
Dinly
Dinly

Reputation: 171

AWS API - Start new instance within an Auto-Scaling group

I would like to start a new instance inside an Auto-Scaling group so the new instance will be 100% identical to other instances in this group. In other words I want to do the same thing AWS does when scaling rules are triggered.

What API method I need to call to achieve this?

Upvotes: 1

Views: 164

Answers (1)

Anthony Neace
Anthony Neace

Reputation: 26003

You can achieve this with the DescribeAutoScalingGroups API and the SetDesiredCapacity API.

Pseudocode:

SetDesiredCapacity allows you to change the "desired capacity" of an AutoScaling group. If you increase the current desired capacity by 1, the AutoScaling Group will launch a new instance based on the AMI associated with your launch configuration. This is what scaling policies do within the bounds of your min/max capacity.

SetDesiredCapacity API Example: (from docs)

https://autoscaling.amazonaws.com/?Action=SetDesiredCapacity
&AutoScalingGroupName=my-asg
&HonorCooldown=false
&DesiredCapacity=2
&Version=2011-01-01
&AUTHPARAMS

set-desired-capacity CLI Example: (from docs)

aws autoscaling set-desired-capacity --auto-scaling-group-name my-auto-scaling-group --desired-capacity 2 --no-honor-cooldown

Reference:

Upvotes: 2

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