Cannot Delete Amazon ECS Cluster using CloudFormation - aws-cloudformation

Question

I am using the following CloudFormation template to create ECS Cluster.
AWSTemplateFormatVersion: '2010-09-09'
Description: 'AWS Cloudformation Template to create the Infrastructure'
Resources:
ECSCluster:
Type: AWS::ECS::Cluster
Properties:
ClusterName: 'Blog-iac-test-1'
EC2InstanceProfile:
Type: AWS::IAM::InstanceProfile
Properties:
Path: /
Roles: [!Ref 'EC2Role']
ECSAutoScalingGroup:
Type: AWS::AutoScaling::AutoScalingGroup
Properties:
VPCZoneIdentifier:
- subnet-****
LaunchConfigurationName: !Ref 'ECSAutoscalingLC'
MinSize: '1'
MaxSize: '2'
DesiredCapacity: '1'
ECSAutoscalingLC:
Type: AWS::AutoScaling::LaunchConfiguration
Properties:
AssociatePublicIpAddress: true
ImageId: 'ami-b743bed1'
SecurityGroups:
- sg-****
InstanceType: 't2.micro'
IamInstanceProfile: !Ref 'EC2InstanceProfile'
KeyName: 'test'
UserData:
Fn::Base64: !Sub |
#!/bin/bash -xe
echo ECS_CLUSTER=Blog-iac-test-1 >> /etc/ecs/ecs.config
EC2Role:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Statement:
- Effect: Allow
Principal:
Service: [ec2.amazonaws.com]
Action: ['sts:AssumeRole']
Path: /
ECSServicePolicy:
Type: "AWS::IAM::Policy"
Properties:
PolicyName: "root"
PolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: Allow
Action: ['ecs:*', 'logs:*', 'ecr:*', 's3:*']
Resource: '*'
Roles: [!Ref 'EC2Role']
The stack is created successfully, but while destroying, I am getting the following error:
The Cluster cannot be deleted while Container Instances are active or draining.
I was able to delete the stack earlier, this issue started to occur recently.
What could be a workaround to avoid this issue ? Should I need to add some dependencies ?

Answer 1

As mentioned in this AWS Documentation Link, have you tried deregistering the instances as well?:
Deregister Container Instances:
Before you can delete a cluster, you
must deregister the container instances inside that cluster. For each
container instance inside your cluster, follow the procedures in
Deregister a Container Instance to deregister it.
Alternatively, you can use the following AWS CLI command to deregister
your container instances. Be sure to substitute the Region, cluster
name, and container instance ID for each container instance that you
are deregistering.
aws ecs deregister-container-instance --cluster default
--container-instance container_instance_id --region us-west-2 --force