Once the instance is configured and has passed the EC2 health checks, it attaches to the group, and its state is “InService. Running script or command on EC2 instance on termination . An instance refresh can replace instances one at a time, several at a time, or all at once. The detach-instances api will also remove the. Specifying -Select '*' will result in the cmdlet returning the whole service response. Reliable fallback to on-demand instances. Record the policy's Amazon Resource Name (ARN). AutoScalingGroupName (string) – [REQUIRED] The name of the Auto Scaling group. Temporarily remove an instance (AWS CLI) How the standby state works The standby state works as follows to help you temporarily remove an instance from your Auto Scaling. You can define N number of instance-ids one after another with space as a delimiter. Autoscaling group EC2 (windows instances) turns 5 instances on every couple of minutes if the queue is not empty, (I currently manually boost the max computers on when the queue is larger). Create an Amazon EC2 Auto Scaling policy that uses target tracking scaling policies or step scaling policies. From the official definition: Auto Scaling is a web service designed to launch or terminate Amazon EC2 instances automatically based on user-defined policies, schedules, and health checks. To stop automatic scaling, see the Amazon EC2 Auto Scaling User Guide, EC2 Fleet, or Create a Spot Fleet request. aws autoscaling exit-standby --instance-ids YOUR-INSTANCE-ID --auto-scaling-group-name YOUR-ASG-NAME. I am now trying to add a warm pool to the ASG (warm_pool block in the API). Avoid scaling spikes: start scaling earlier, in smaller chunks, and more frequently. 4. Step 9. ) Make sure there is at least 1 instance in the Auto Scaling group. Amazon EC2 Auto Scaling Warm Pools now support two new features: you can now hibernate your Warm Pool instances and you can configure your Auto Scaling group to return running instances to a Warm Pool on scale-in. Amazon EC2 metric dimensions. This will create a new instance in the ASG group,. You can then manage the number of running instances manually or dynamically, allowing you to lower operating costs. Gets information about the Auto Scaling groups in the account and Region. For more information, see Suspending and resuming scaling processes in the Amazon EC2 Auto Scaling User. Make sure to replace the relevant subnets that you intend to use in the VPCZoneIdentifier. The longest one was running for 3 days until I manually terminated it. After the stack is deployed successfully, you will see the Gitlab Runner autoscaling group created in the EC2 console: Under your Gitlab project Settings > CICD > Runners > Available specific runners, you will see the fully configured Gitlab Runner. For more information, see Scaling cooldowns for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide. Can scale down, even if the cluster is not idle, by looking at shuffle file state. Launch an Auto Scaling group that spans 2 subnets in your Custom VPC. Clean up tutorial resources. Yes, you can run a shell-script on your terminating EC2 instance using AWS Systems manager. PROJECT. SHUTDOWN scripts on Ubuntu must be run as a service, and all services must be in the location /etc/systemd/system/. If you specify filters, the output includes information for only those Auto Scaling. On the navigation bar at the top of the screen, choose the Region where the load balancer was created. 24. My goal is to automatically assign an elastic IP to an auto-scaled EC2 instance. The syntax is exactly the same as the separate aws_autoscaling_lifecycle_hook resource, without the autoscaling_group_name attribute. You can use it to build resilient, highly scalable applications that react to changes in load by launching or terminating Amazon EC2 instances as needed, all driven by system or user-defined metrics collected and tracked by Amazon CloudWatch. Enter a name for the policy. The script is located in the following directory by default: C:ProgramDataAmazonEC2-WindowsLaunchScripts. When you stop an instance, the following is lost:Amazon EC2 Auto Scaling offers the ability to add lifecycle hooks to your Auto Scaling groups. The template would be references in attribute launch_template of the ASG. This helps you to ensure that instances are ready to quickly start serving application traffic, accelerating the. It seems that normal machine reboots and cycles properly fire up said script. The instance remains in this state until you exit the standby state. Changes to a DB instance can occur when you manually change a parameter, such as allocated_storage, and are reflected in the next maintenance window. You can use the AWS CloudFormation template provided in this post to: Create a Systems Manager parameter. 2. The AWS CLI v2 offers several new features including improved installers, new configuration options such. Shutdown EC2 instance. ps1 -Schedule. Previously, you could use one of the predefined termination policies to determine which instances Auto Scaling would terminate. The Lambda function changes the ECS container instance. Automating the shutdown of EC2 Instances is one very effective method for controlling costs. 11. Do you really need ELB for Dev environments? I feel this is overkill. However there are couple of options you can consider. Posted On: Jul 29, 2021. Create a security group that allows traffic from the internet and associate it with the Auto Scaling group instances. It covers first case and gives me 2 minutes to clean up before shutdown. Record the policy's Amazon Resource Name (ARN). AWS CLI is installed and configured with a valid AWS account with permission to deploy the autoscaling group and application load balancer. For <account>, enter your 12-digit AWS account ID. You can use the AWS CloudFormation template provided in this post to: Create a Systems Manager parameter. Select Launch Template, and choose the template named AutoScale-SQS. When an instance is terminated, the instance status changes to terminated . You can use autoscaling group lifecycle hooks to prevent the ASG from terminating an instance before the hook is marked as complete. Convenient method forms pass through to the corresponding overload that takes a request object, which. Part of AWS Collective. While after these steps, ASG will terminate another instance (not the one i drained) and start a new instance. Create an Amazon EC2 Auto Scaling launch template with the latest. Then use aws ec2 wait instance-terminated command and pass instance ids. It allows you to have control over the lifecycle of EC2 instances and the associated EBS volumes. cd back to your correct file then apply the changes and type yes. Create an Amazon EC2 Auto Scaling launch template with the Microsoft. Example 4: Return instances to the warm pool when scaling in. Install and configure Jenkins. A split pane opens up in the bottom of the Auto Scaling groups page. Choose a distribution that both Docker and GitLab Runner support, like. When you disable a scaling policy, the configuration details are preserved, so you can quickly re-enable the policy. AWS CLI is installed and configured with a valid AWS account with permission to deploy the autoscaling group and application load balancer. The instance will shut down when the graceful shutdown process exits. To avoid a race condition between the reboot and recover actions, avoid setting the same evaluation period for both a reboot alarm and a recover alarm. See also . Autoscaling with python. Specify a user data script that configures instances at launch. 20 per instance for detailed monitoring is beyond difficult to justify. If you have custom health checks, you can send the information from your health checks to Amazon EC2 Auto Scaling so that Amazon EC2 Auto Scaling can use this information. In the AWS Management Console, navigate to the EC2 Dashboard. Then, restart the instances so they use the new AMI. A lifecycle hook lets you create solutions that are aware of events in the Auto Scaling instance lifecycle, and then perform a custom action on instances when the corresponding lifecycle event occurs. Select the group of the instance that you want to reboot. Choose Actions, Create Auto Scaling group. You could then use this with Target tracking scaling policies for Amazon EC2 Auto Scaling - Amazon EC2 Auto Scaling, which will calculate the average value of the metric and. This example shows an AWS::AutoScaling::AutoScalingGroup. Any pointers in the right direction is highly appreciated! Saves up to 90% of AWS EC2 costs by automating the use of spot instances on existing AutoScaling groups. Based on what I've read so far it is ridiculously easy to write the function per instance, again it can be done almost by clicking next next finish within AWS, but we don't want to have. 5. Instance sizes - Large, XLarge, 2XLarge. 4. (non auto-scaling) can be specified using the normal Compose syntax: content_copy. 0. However, rather than having Auto Scaling terminate an instance through a scale-in event, you can specifically remove an instance. When prompted for confirmation, choose Stop. A Systems Manager association detects this new instance based on its tag and runs a Systems Manager Document containing information about your directory. m3. For more information, see Set the health check grace period for an Auto Scaling group. With the instance still selected, choose Actions , Instance settings, Change instance type. Option 3: Add/Remove instances to an Auto Scaling group. Run shutdown -h now as root. The amazon. Now create the Lambda that will start and stop your instances: Make sure to pick Python 2. Here's kind like the gist: servicesdown. Prerequisites. A DB instance can contain multiple user-created databases. For Tag key, enter DEV-TEST. Select the check box next to the Auto Scaling group that you just created. group. Terminate instances accepts multiple instance-ids at once. Intro. You can skip this step if your Auto Scaling group is not associated with any CloudWatch alarms, or if you want to keep the alarms for future use. The instance that gets destroyed has a shutdown script that takes several minutes to complete in order to gracefully shut down running software. Upvoted this answer because describe-auto-scaling-groups is a lot faster than describe-auto-scaling-instances. The script joins each instance to your domain by issuing the SSM API action. This is normal behavior but sometimes there are use cases when you might need to run. In the navigation pane, under Auto Scaling, choose Auto Scaling Groups. So after all, 2 instances are terminated and one new. Amazon EC2 Auto-Scaling Lifecycle Hooks. This will also terminate the EC2 instances. Example 7: To apply a simple scaling policy for scale in. Then use aws ec2 terminate-instances like you are doing. An Auto Scaling group is a collection of instances you define if you're using Auto Scaling. There’s no need to build our own AMI unless the software installation takes too long. Deploy the artifact bundle you want to be automatically deployed to the deployment group. The launch. An Auto Scaling lifecycle hook to publish notifications. Auto Scaling groups help you configure your Jenkins EC2-Fleet plugin to control Jenkins build agents and scale up or down depending on the job queue. You can attach a termination lifecycle hook to your ASG using the aws_autoscaling_lifecycle_hook resource: resource "aws_autoscaling_group" "example" { availability_zones = ["us-west-2a. When instances reach a wait state, Amazon EC2 Auto Scaling sends a notification. I have a problem with the user-data script on the warm pool instances: You create an auto scaling policy to increase the group size based on demand. When scaling-in, instances are terminated. For example, using OpenStack Heat - nodes are automatically given a hostname based on the number of nodes in the autoscaling group: instance_group: type: OS::Heat::ResourceGroup properties: count: {. This is easier than temporarily deleting a policy when you don't need it, and recreating it later. On the Automatic scaling tab, in Scaling policies, choose Create predictive scaling policy. With the instance still selected, choose Actions , Instance settings, Change instance type. Set up AWS Lambda function that receives state messages from SQS, sends a remote command with SSM to initiate graceful shutdown on the EC2 instance. I think incorporating a few ideas from the built-in autoscaling process in EC2 may help you out here: Yes, I would build a master AMI that has everything loaded you need it to. Suspends the specified auto scaling processes, or all processes, for the specified Auto Scaling group. Create a database using an EC2 instance in theUse AWS Lambda and Amazon EventBridge to automatically stop and start Amazon EC2 instances. Reserve capacity only when you really need to. With lifecycle hooks, instances remain in a wait state either until you notify Amazon EC2 Auto Scaling that the specified lifecycle action is complete, or until the timeout period ends (one hour by default). For Value, enter Auto-Shutdown. Create an Auto Scaling Group. This topic describes how to temporarily disable a scaling policy so it won't initiate changes to the number of instances the Auto Scaling group contains. Predictive scaling – Scaling plans also support predictive scaling for Auto Scaling groups. For information, see Monitoring Deployments with Amazon CloudWatch Tools. m3. The AWS Command Line Interface (AWS CLI) is a unified tool to manage your AWS services. I have an auto-scaling group (ASG) on AWS. The instance is started using a recurring schedule action that raises the min and max to 1. Important. Once Auto Scaling decides to terminate an instance in response to a scaling policy, it uses a Termination Policy to determine which instance to. Based on the comments, the intent is to create an autoscaling group in AWS. Be sure to replace YOUR-INSTANCE-ID with your instance's resource ID and YOUR_ASG_NAME with your EC2 Auto Scaling group's name. Suspends the specified auto scaling processes, or all processes, for the specified Auto Scaling group. To get the additional launch configurations, use the value of this field with the --starting-token option in a. 4 Answers Sorted by: 5 You could also use Lifecycle hooks. . My cfn-init script signals back too early. Select your Auto Scaling group and click on the Scaling. The script gets the instance ID (and AWS region) from the Amazon EC2 metadata service. Cloud-Init takes a script passed via EC2 User Data and runs it as root during the first boot of an instance. To avoid issues with unexpected terminations when using Amazon EC2 Auto Scaling, you must design your application to respond to this scenario. Create an Amazon EC2 Auto Scaling group. Example 2: Keep instances in the Running state. e. ECS also supports different deployment options, including rolling deployments. 12. The following steps walk you through assigning tags for a scheduled stop and start: On the Amazon RDS console, choose a database and the instance within that database that you want to add tags to. Then, launch the instance in a supported Availability Zone. This notification can come from sources such as. In my ‘Steady Performance with AWS auto scaling’ Article I demonstrated how to configure a highly available and scalable cloud deployment with EC2 auto scaling. # aws ec 2 terminate-instances – instance-ids i -0 aac 8 d 3 e 627 de 822. Amazon EC2 Auto Scaling helps to maintain your Amazon EC2 instance availability. – John Rotenstein. For your particular situation, you could use a User Data script that retrieves this value and then updates the Tag of the instance accordingly. I'm bootstrapping an Amazon Elastic Compute Cloud (Amazon EC2) Windows instance using the cfn-init (cfn-init. Create, modify, and delete EC2 Launch Templates, which can be used to create individual instances or with Autoscaling Groups. If your instance remains in the shutting-down state longer than a few minutes, it might be delayed due to shutdown scripts being run by the instance. On the Detach Instance page, choose Detach Instance. Part of AWS Collective. Instance hibernate: EC2 instances support hibernation. After. Step 4: Create an Auto Scaling Group. Then say on Ubuntu/Debian you would do something like this to add it to your shutdown sequence: Step 1 - Create IAM Policy and Role. Sorted by: 119. MetricAggregationType (string) – The aggregation type for the CloudWatch metrics. If the aggregation type is null, the value is treated as Average. You can specify the minimum number of instances in each Auto Scaling group, and Amazon EC2 Auto Scaling ensures that. Create an Amazon EC2 Auto Scaling group. 0 Published 12 days ago Version 5. For more information on CloudTrail, see Monitoring Amazon RDS API calls in AWS CloudTrail. When the auto-scaling group scales out (spawns new instance) I'd like to run a command on the instance to join the Docker swarm (i. When an Auto Scaling group needs to scale in, replace an unhealthy instance, or re-balance. 249K subscribers in the aws community. Part one of this series focused on using CloudWatch Event Rules and Lambdas to automate EC2 instance startup and shutdown. The following summarizes the flow for a scale-out event. Before you begin this tutorial, create an Auto Scaling group, if you don't have one already. I know that AWS reserves a section for "user-data" where people can input their scripts and they can be executed at instance creation but I guess I am more comfortable having a start up script baked in to the image itself. Declaring a single instance Auto Scaling group . If you want to configure autoscaling for ECS, the Autoscaling Target is your ECS Service, example: #. Auto Scaling group: In Amazon EC2, you have the option to set up Amazon EC2 Auto Scaling to make sure that you have the optimal number of EC2 instances to handle your workload. Installs in minutes using CloudFormation or Terraform. aws autoscaling describe-launch-configurations --max-items 1. 2. There’s no need to build our own AMI unless the software installation takes too long. AWS sets the Spot price for each instance type in each availability zone based. For more information, see the Amazon EC2 Auto Scaling User Guide and the Amazon EC2 Auto Scaling API Reference. Step 1: Manually Launch EC2. Wait for existing connections to drain, either by monitoring existing connections to your application or by allowing a "safe" amount of time. Parameters are like variables. ASGs can take. Here’s how to build an example Auto Scaling group using the new CLI tools. Exact command. Convenient to deploy at scale using StackSets. Latest Version Version 5. Auto Scaling lifecycle hooks. run "kubectl drain xxx"; 2. Part one of this series focused on using CloudWatch Event Rules and. For more information, see IAM role for applications that run on Amazon EC2 instances. When you use an OS command, the instance stops by default. You could have each server regularly send a custom metric to Amazon CloudWatch. What I tried so far: - Created an ECS task. Add the new instance to the affected deployment group. ECS (Elastic Container) EFS (Elastic File System) EKS (Elastic Kubernetes) ELB (Elastic Load Balancing) ELB Classic. You can use hibernation instead of stopping the instance. You can use the output when deleting the policy and the CloudWatch alarms. AWS Auto Scaling groups (ASGs) let you easily scale and manage a collection of EC2 instances that run the same instance configuration. These instances will be used solely as a means to test our lambda functions. 1. If you already have one, you can skip to step 4. the requirement is that the instances that are added to the target group and then removed cannot be terminated. The health status of the instances in your Auto Scaling group indicates whether they are healthy or unhealthy. Step 2: Create VPC and Resources. View the default metrics that Amazon EC2 sends to CloudWatch for the following 5 minutes of activity from the start time. That can stay as it is, simply click on Create Tag to create a new tag. To use Warm Pools with your Amazon ECS cluster, you simply need to set the ECS_WARM_POOLS_CHECK environment variable to true in the User data of your Amazon EC2 Auto Scaling Group launch template. Create an Amazon EC2 Auto Scaling launch template with the Microsoft. Presumably, ASG instances must be terminated during scale in events. Posted On: Jul 29, 2021. Alternatively, to create a new launch template, use the following procedure. Amazon EC2 Auto Scaling is designed to automatically launch and terminate EC2 instances based on user-defined scaling policies, scheduled actions, and health checks. terminate an EC2 instance by default, AutoScaling will: Choose 2 answers A. Ease of creating on-demand resources on AWS can sometimes lead to over-provisioning or under-utilization of AWS resources like Amazon EC2 and Amazon RDS. Write down the Name of your autoscaling group. While EC2 Auto Scaling provides more flexibility, AWS Auto Scaling delivers simplicity. For more information, see Health checks for Auto Scaling instances in the Amazon EC2 Auto Scaling User Guide. Amazon ElastiCache for Redis now supports auto scaling to automatically adjust capacity to maintain steady, predictable performance at the lowest possible cost. I am now trying to add a warm pool to the ASG (warm_pool block in the API). You can do this from the EC2 console or CLI: aws autoscaling put-lifecycle-hook --lifecycle-hook-name my-lifecycle-hook --auto-scaling-group-name My_AutoScalingGroup Amazon EC2 Auto Scaling uses termination policies to determine which instances it terminates first during scale-in events. To check the availability of the instance types in specific Availability Zones, run the aws ec2 describe-instance-type-offerings command in the AWS CLI. 38Open the Launch templates page of the Amazon EC2 console. To signal Amazon EC2 Auto Scaling when the lifecycle action is complete, you must add the CompleteLifecycleAction API call to the script, and you must manually create an IAM role with a policy that allows Auto Scaling instances to call this API. Initiate a shutdown on the nodeX EC2 instance using the EC2 API directly or Abstracted scripts. This ensures that your application has the compute capacity that you expect. I am developing an application that monitors the instances of an Autoscaling group with the goal of work with its elasticity. For more information, checkout this AWS tutorial located here. Open the Amazon EC2 console. One of the following two issues causes this error: 1. The Lambda function is then executed in response to the SNS message trigger. Step 1: Define Parameters. Create a security group for your Amazon EC2 instance. I am using terraform and their aws_autoscaling_group resource as my API. For Auto Scaling group name, enter a name for your Auto Scaling group. ; Replace t2. Introduction. When the group launches EC2 instances, their state is “pending. Amazon EC2 attempts to shut an instance down cleanly and run any system shutdown scripts; however, certain events (such as hardware failure) may prevent these system. User data shell scripts must start with the #! characters and the path to the interpreter you want to read the script (commonly /bin/bash). Amazon ElastiCache for Redis now supports auto scaling to automatically adjust capacity to maintain steady, predictable performance at the lowest possible cost. 7 and your existing role created. Suspending a process affects all instances in your Auto Scaling group. There is no configurable OS shutdown time. 7 onwards. If you decrement the capacity but detach multiple instances from the same Availability Zone, Amazon EC2 Auto Scaling can rebalance the Availability Zones unless you suspend the AZRebalance process. On the Tags tab underneath the instance details, choose Add tags. Enable instance scale. This group will turn off three instances when the CPU average across the whole pool drops to 20% and add three instances when CPU reaches 70%. if you really want to do this with CLI, you may first want to use aws autoscaling suspend-processes command to prevent ASG from creating new instances. when an instance needs to be added to the target group due to metric. On the ElastiCache console, choose Redis. Default: None. Extend and manage your infrastructure to include cloud resources published in the CloudFormation Registry, the developer community, and. ) and when it scales in (shuts down instances) to leave the swarm ( docker swarm leave ). Another possible cause is a problem with the underlying host computer. Example 2: To send an Amazon SNS email message to notify you of instance state transitions. Step 1 — Launch an Auto Scaling group that spans 2 subnets in your default VPC. Here are the broad strokes of the process: # AWS_Billing_Overage_Shutdown. You use this tag later on when using. After the instance is put into hibernation the instance is stopped. D) Create new public and private subnets in a new AZ. For all other use-cases, please use aws_autoscaling_lifecycle_hook resource: list(map(string)) [] no: instance_initiated_shutdown_behavior Amazon EC2 Auto Scaling offers the ability to add lifecycle hooks to your Auto Scaling groups. SHUTDOWN scripts on Ubuntu must be run as a service, and all services must be in the location /etc/systemd/system/. docker swarm join. The issue is that when deploying the auto-scaled launch config I lose the ability to allow it to. AWS sets the Spot price for each instance type in each availability zone based. Describes a lifecycle hook. As variant. Use the search box on the console navigation bar to search for CloudShell and then choose the CloudShell option. To keep the policy in forecast only mode, keep Scale based on forecast turned off. Create ENI (network interface) and assign it Private IP address of your choice, In the Auto Scaling Launch Configuration write user data script which uses the AWS cli tools to discover the pre created ENI and attach it to the ec2. I can cover Presto/Trino cluster setup on AWS EC2 autoscaling group in a separate post. Select the check box next to the Auto Scaling group that you just created. Create an Amazon EC2 Auto Scaling policy that uses target tracking scaling policies or step scaling policies. 2 :: Continuum Analytics, Inc. ”. No. For example, you can suspend the. With ephemeral runners, this can be guaranteed because GitHub only. Uses tagging to avoid launch configuration changes. Expect failures: manage retries and fallback options. You create collections of EC2 instances, called Auto Scaling groups. Or what if there is a systemd shutdown script that should run before an instance is terminated. Create an Amazon EC2 Auto Scaling policy that uses target tracking scaling policies or step scaling policies. Currently if I want drain a node in EKS. 0put a # in front of tags then hit “esc” “:wq”. Open the Auto Scaling groups page of the Amazon EC2 console. 1 Answer. If the output includes a NextToken field, there are more launch configurations. Our first step is to find the EC2 instance we want to automatically turn off. QUOTE: "If you run a script on instance termination, your instance might have an abnormal termination, because we have no way to ensure that shutdown scripts run. aws autoscaling put-scaling-policy --policy-name my-simple-scale-in-policy --auto-scaling-group-name my-asg --scaling-adjustment -1 --adjustment-type ChangeInCapacity --cooldown 180. Clicking the “+” icon in the Alarm Status column will open up the page to manage CloudWatch Alarms (the feature we’ll be using) Navigate to the “Create Alarm” page. Updating Auto Scaling Groups to Use Launch Templates Using the AWS Console: Navigate to the AWS EC2 console, open the navigation pane, and select Auto Scaling Groups. g. terminate the ec2 instance drained in last step; 3. You can use the following. Is there any way to have either ELB or an EC2 auto-scaling group terminate (or reboot) unhealthy instances from ELB? There are some specific database failure conditions in our front end which makes it turn unhealthy, so the ELB will stop routing traffic to it. I am in the process of setting up an auto scaling group in AWS with a custom AMI. If I want to make some changes to the systems' configuration (say update the libssl package), I see two options: (1) run packer / manually create a new AMI and setup my auto scaling group to use it. On the navigation bar at the top of the screen, choose the same Region that you used when you created the Auto Scaling group. For Amazon EC2. This is obviously really slow and causes downtime. Launched in May of 2009, EC2 Auto Scaling is designed to help you maintain application availability by providing three key benefits: improving fault tolerance, increasing application availability, and lowering costs. In the Auto Scaling group wizard, specify how many instances to start with and a tag for each instance launched as part of this group. This starts the policy creation wizard. AbstractAmazonAutoScalingAsync. Example 2: To hibernate an Amazon EC2 instance. This command produces no output. 2. Lets say I have crontask. To work around this issue, follow these steps: Manually create an EC2 instance that is not part of the Amazon EC2 Auto Scaling group. ECS also allows you too have scheduled tasks which is perfect. Then, AWS CloudFormation marks my Windows instance as CREATE_COMPLETE before the instance finishes. As per as Private IP is concern kindly create small subnet and choose it when creating Auto Scaling Group. ”. Once you decide that an instance needs to self-terminate, do whatever work you need to do before terminating, and then call the as-terminate-instance-in-auto-scaling-group command with --decrement-desired-capacity option to terminate the instance. Create an Amazon EC2 Auto Scaling launch template with the latest. Termination policies define the termination criteria that is used by Amazon EC2 Auto Scaling. 1 Python version: Python 3. The hooks responds to scale. Scaling Policies are used to change the Desired Capacity of an Auto Scaling group. The code is placed in the below GitHub repository which will be referred in this post. You may consider to run your script using AWS Data Pipeline.