How can I dynamically observe/change limits of a Autoscale group?

Question

I want to modify the number of minimum/maximum/target instances of an autoscale group and see if there's any instance on from this autoscale group, all dynamically using the AWS SDK for Python. How can I do it?

I'm unable to find it from literature.

Answer 1

First verify your time is sync with aws:

sudo ntpdate pool.ntp.org

Read configuration:

import boto3

client = boto3.client('autoscaling')

response = client.describe_auto_scaling_groups(
    AutoScalingGroupNames=[
        'autoscaling_group_name',
    ]
)

print(response['AutoScalingGroups'][0]['MinSize'], response['AutoScalingGroups'][0]['MaxSize'], response['AutoScalingGroups'][0]['DesiredCapacity'], response['AutoScalingGroups'][0]['Instances'])

Set desired/min/max:

response = client.update_auto_scaling_group(
    AutoScalingGroupName='autoscaling_group_name',
    MinSize=123,
MaxSize=123,
DesiredCapacity=123,
)