aws: boto3 get all instances of a load balancers

Question

I can able to get the load balancers using below

import boto3
elb = boto3.client('elbv2')
lbs = elb.describe_load_balancers()

How to get the instances of the lbs.

Also How Can I fetch the load balancers which state is not active as describe_load_balanacers only give state active load balanceres.

Answer 1

Classic Load Balancer

Use: client = boto3.client('elb')

Then describe_load_balancers() results include a list of instances:

        'Instances': [
            {
                'InstanceId': 'string'
            },
        ],

Application Load Balancer

Use: client = boto3.client('elbv2')

• Call describe_target_groups() passing in the Load Balancer ARN to obtain a list of Target Groups associated with the Load Balancer
• Then call describe_target_health() to obtain a list of targets (instances).

Here is a sample response:

{
    'TargetHealthDescriptions': [
        {
            'Target': {
                'Id': 'i-0f76fade',
                'Port': 80,
            },
...