Instance-ALB-TG-Checker

#!/bin/bash

# Prompt the user to enter the instance ID to check for
read -p "Enter the instance ID to check for: " INSTANCE_ID

# Get a list of all load balancer ARNs in the current AWS account
LB_ARNS=$(aws elbv2 describe-load-balancers --query "LoadBalancers[].LoadBalancerArn" --output text)

# Loop through each load balancer ARN and check if the instance is registered with any target groups
for LB_ARN in $LB_ARNS
do
  # Get a list of all target groups associated with the current load balancer
  TG_ARNS=$(aws elbv2 describe-target-groups --load-balancer-arn $LB_ARN --query "TargetGroups[].TargetGroupArn" --output text)

  # Loop through each target group ARN and check if the instance is registered with it
  for TG_ARN in $TG_ARNS
  do
    # Get a list of all registered targets in the current target group
    TARGETS=$(aws elbv2 describe-target-health --target-group-arn $TG_ARN --query "TargetHealthDescriptions[?Target.Id=='$INSTANCE_ID'].{TargetHealth:TargetHealth.State,TargetGroupArn:TargetGroupArn,LoadBalancerArn:LoadBalancerArn}" --output json)

    # If the list of registered targets is not empty, print the load balancer and target group information
    if [ "$TARGETS" != "[]" ]
    then
      echo "Instance $INSTANCE_ID is registered with the following load balancer and target group:"
      echo "Load balancer ARN: $LB_ARN"
      echo "Target group ARN: $TG_ARN"
      echo "Target health: $(echo $TARGETS | jq -r '.[0].TargetHealth')"
    fi
  done
done