The following stop-instances example hibernates Amazon EBS-backed instance if the instance is enabled for hibernation and meets the hibernation prerequisites. Example 4: Return instances to the warm pool when scaling in. An AWS EC2 Spot Instance is an unused EC2 instance which is available for less than the On-Demand price. AutoScalingGroupName (string) – [REQUIRED] The name of the Auto Scaling group. 1. For example, notifying an auditing. 2. Choose Create New Pipeline and enter the following information:. With just one tool to download and configure, you can control multiple AWS services from the command line and automate them through scripts. I'll introduce the resources that you need one by one. For example, you can suspend the HealthCheck and ReplaceUnhealthy processes to reboot instances without Amazon EC2 Auto Scaling terminating the instances based on its health checks. Note: The following resolution is a simple example solution. aws. Enable instance scale. For more information, see the Application Auto Scaling User Guide. You can add the complete-lifecycle-action command to the script. For example, you can suspend the. If you already have one, you can skip to step 3. ) and when it scales in (shuts down instances) to leave the swarm ( docker swarm leave ). Run my docker job. So we have a large AWS Autoscale requirement (100+ instances) and I'm discovering that there isn't a way for the AWS Autoscale to scale down based on each individual instance's CPU usage - it only looks at the Autoscale's collective CPU usage. . The underlying assumption of the second. Create an Autoscaling Target. For your particular situation, you could use a User Data script that retrieves this value and then updates the Tag of the instance accordingly. 0 onwards. AWS ECS uses a percent-based model to define the number of containers to be run or shut down during a rolling update. ; Replace t2. After that the script deregisters the instance from the load balancer by putting the instance into standby mode in the Auto Scaling group. Suspends the specified auto scaling processes, or all processes, for the specified Auto Scaling group. Part of AWS Collective. 1 Answer. To create or update tags for an Auto Scaling group. Create an Amazon EC2 Auto Scaling launch template with the latest. Meanwhile, EC2 Auto Scaling relies on predictive scaling, which uses machine learning to determine the right amount of resource capacity necessary to maintain a target utilization for EC2 instances. Workspace in the Premium and Enterprise pricing plans use optimized autoscaling. 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. On the navigation bar at the top of the screen, choose the Region where the load balancer was created. I’m performing terraform apply, that destroys and creates a new ec2 instance. This example shows an AWS::AutoScaling::AutoScalingGroup. Step 2: Create VPC and Resources. Examples: Scale out to 10 instances on weekdays, and scale in to 4 instances on Saturday and Sunday. When scaling-in, instances are terminated. 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. Disconnect from your Windows instance. The user-data script runs shutdown at the end to move the. Open the Auto Scaling groups page of the Amazon EC2 console. You can use the AWS CloudFormation template provided in this post to: Create a Systems Manager parameter. To run updated scripts the next time the instance is started, stop the instance and update the user data. Create an Amazon EC2 Auto Scaling policy that uses target tracking scaling policies or step scaling policies. If you already have one, you can skip to step 4. The following stop-instances example hibernates Amazon EBS-backed instance if the instance is enabled for hibernation and meets the hibernation prerequisites. Autoscaling operations aren't logged by AWS CloudTrail. Extend and manage your infrastructure to include cloud resources published in the CloudFormation Registry, the developer community, and. 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. when an instance needs to be added to the target group due to metric. 1 Answer. You create an auto scaling policy to increase the group size based on demand. Amazon EC2 Auto Scaling helps to maintain your Amazon EC2 instance availability. You create collections of EC2 instances, called Auto Scaling groups. The latest Terraform binary is installed and configured in your system. : as-terminate-instance-in-auto-scaling-group --decrement-desired-capacity i-d15ea5eProblem: Fargate tasks are being shut down without completing the processes within the task upon scaling in. 25. Go to the CloudFormation console, select the stack you created, and delete it. Step 1: Create an IAM role with permissions to complete lifecycle actionsDefault termination policy and mixed instances groups. Based on the comments, the intent is to create an autoscaling group in AWS. 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. To prevent Amazon EC2 Auto Scaling from terminating unhealthy instances, suspend the ReplaceUnhealthy process. Graceful shutdown is triggered by the ACPI shutdown button press event from the hypervisor. The terminal will give. For example, the value can be used to differently configure a specific instance within an Auto Scaling group. Make use of EC2 Autoscaling and EC2 Fleet whenever possible. These operations are also possible using the Command Line Interface or AWS CloudFormation. Autoscaling operations aren't logged by AWS CloudTrail. 01. aws autoscaling set-instance-health --instance-id i-123abc45d --health-status healthy You can get instance-id using curl call, the script that we place in the userdata. A warm pool is a pool of pre-initialized EC2 instances that sits alongside an Auto Scaling group. Record the policy's Amazon Resource Name (ARN). This will create a new instance in the ASG group,. The valid values are Minimum, Maximum, and Average. 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. As per as Private IP is concern kindly create small subnet and choose it when creating Auto Scaling Group. The syntax is exactly the same as the separate aws_autoscaling_lifecycle_hook resource, without the autoscaling_group_name attribute. d/myscript and a symlink to /etc/rc0. Another plus to Terraform, until it is deployed, the. The way I set this up, in short, is: Create a role that allows auto scaling to post a message to an SQS queue. 20 per instance for detailed monitoring is beyond difficult to justify. 0 Published 6 days ago Version 5. Queries that are running will complete execution before the node is decommissioned. It allows you to have control over the lifecycle of EC2 instances and the associated EBS volumes. Deleting an Auto Scaling group automatically deletes the CloudWatch alarms that Amazon EC2 Auto Scaling manages for a target tracking scaling policy. In this post, I provided a CloudFormation template and explained how it is used for executing code before an Amazon EC2 Auto Scaling instance terminates. Moreover, every resource including Amazon EC2 instances and Auto Scaling groups run within your. It would always get executed when doing a graceful shutdown. Prerequisites. Enable instance scale. This will also terminate the EC2 instances. Prerequisites. Example 6: Define the warm pool maximum capacity separately. Create an Auto Scaling group. ) Creates or updates a warm pool for the specified Auto Scaling group. When you use an OS command, the instance stops by default. To stop automatic scaling, see the Amazon EC2 Auto Scaling User Guide, EC2 Fleet, or Create a Spot Fleet request. 98. ts file. 1. terraform apply -target=aws_security_group. Example 7: To apply a simple scaling policy for scale in. The following summarizes the flow for a scale-out event. On the last page of the Launch Configuration wizard, choose Create an Auto Scaling group using this launch configuration. Is there an easy way to get such 2-minute notification for second case? First and foremost, the AWS autoscaling group is a container for multiple instances that are based on a launch configuration. 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. You can use autoscaling group lifecycle hooks to prevent the ASG from terminating an instance before the hook is marked as complete. 1 Python version: Python 3. EC2 (Elastic Compute Cloud) EC2 Image Builder. Open the Amazon EC2 console. We are using default VPC, which will be selected, so select us-east-1a as subnet. Nathan Mcguirt, AWS Solution Architect Using automation to extend Auto Scaling functionality Auto Scaling provides customers a great way to dynamically scale applications, and we frequently meet customers with new and interesting use cases who want to extend Auto Scaling with additional actions. 26. I am guessing you have put Instance scale-in protection from autoscaling group -> Advanced configurations. To follow this guide you need to have the following. ECR (Elastic Container Registry) ECR Public. Part of AWS Collective 1 I am trying to create a Lambda function that will filter through all running instances, finding the instances that have certain tags, and then shut those instances down. Select a launch template. Thus your docker_run. Prerequisites. This metadata value is useful for naming or identifying instances launched under Auto Scaling. and have that script run before instance shutdown. json. Here's kind like the gist: servicesdown. Find your EC2 Instance and click “+” in the Alarm Status column. Another possible cause is a problem with the underlying host computer. You can attach a termination lifecycle hook to your ASG using the aws_autoscaling_lifecycle_hook resource: resource "aws_autoscaling_group". In the left-hand menu, click on Auto Scaling groups under Auto Scaling. I have a problem with the user-data script on the. :param server_startup_script_file: The path to a Bash script file that is. this script is designed for auto-scaling scenarios - if a runner is unclaimed, it will quit and the system will shut down as defined in the below service. In the AWS Management Console, navigate to the EC2 Dashboard. PROJECT. Amazon ECS leverages the Application Auto Scaling service to provide this functionality. Running script or command on EC2 instance on termination . The EC2 instances in the ASG run a user-data bash script when they launch. Amazon EC2 Auto Scaling now lets you control which instances to terminate during a scale-in event by allowing you to provide a custom function that selects which instances to terminate. 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. Capacity Rebalancing complements the capacity optimized allocation strategy (designed to help find the most. For more information, see Suspending and Resuming Scaling Processes in the Amazon EC2 Auto Scaling User Guide. By default, this cooldown period is set to 300 seconds (5 minutes). 1 Answer. terminate an EC2 instance by default, AutoScaling will: Choose 2 answers A. Tutorial: Creating a cluster with a Fargate Linux task using the AWS CLI; Tutorial: Creating a cluster with a Fargate Windows task using the AWS CLI; Tutorial: Creating a cluster with an EC2 task using the AWS CLI; Tutorial: Using cluster auto scaling with the AWS Management Console and the Amazon ECS consoleHow autoscaling behaves. micro with an instance type that is compatible with the AMI that you specified. See also . sh script. The instances are only on for half. Sorted by: 1. This example creates a lifecycle hook with the Amazon SNS topic and IAM role to use to receive notification at instance launch. On the ElastiCache console, choose Redis. Now using AWS web console, go to the instance of the EC2 service. A lifecycle hook provides a specified amount of time. This is how long Amazon EC2 Auto Scaling needs to wait before checking the health status of an instance after it enters the InService state. 1,000 handler operations. Your launch template or launch configuration must specify this role using an IAM instance profile. Include a script in your user data to launch an Apache webserver. Example 7: To apply a simple scaling policy for scale in. d/ starting with S01 so the script will be executed first in the sequence of scripts. Then, within the chosen AZ, it uses the Termination Policy to determine which instance to terminate. Workspace in the Premium and Enterprise pricing plans use optimized autoscaling. 04 Ray installed from (source or binary): pip install Ray version: 0. "Auto Scaling" and "AWS Instance Scheduler" don't really fit together nicely. In this section, we are going to see how to terminate multiple EC2 instances at the same time using the AWS CLI command. Suspends the specified auto scaling processes, or all processes, for the specified Auto Scaling group. Can scale down, even if the cluster is not idle, by looking at shuffle file state. However, rather than having Auto Scaling terminate an instance through a scale-in event, you can specifically remove an instance. For a more advanced solution, use the AWS Instance Scheduler. Record the policy's Amazon Resource Name (ARN). 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. The code is placed in the below GitHub repository which will be referred in this post. ECS also supports different deployment options, including rolling deployments. LaunchConfigurationName (string) – The name of the launch configuration. This script would execute anything that you need to shutdown which would be scripts under /usr/share/services for example. Select the Auto Scaling group created and select Edit. The script is located in the following directory by default: C:ProgramDataAmazonEC2-WindowsLaunchScripts. Start EC2 instance. 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. 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. It covers first case and gives me 2 minutes to clean up before shutdown. Lets say I have crontask. 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. (non auto-scaling) can be specified using the normal Compose syntax: content_copy. A common way to create custom actions for lifecycle hooks is to use notifications that Amazon EC2 Auto Scaling sends to other services, such as Amazon EventBridge. You can use the following. or running custom scripts — that can take several minutes or longer before those EC2 instances are ready to serve. Diego Natali, AWS Cloud Support Engineer. The halt. A Spot Price is the hourly rate for a Spot instance. GitHub recommends implementing autoscaling with ephemeral self-hosted runners; autoscaling with persistent self-hosted runners is not recommended. Once Auto Scaling decides to terminate an instance in response to a scaling policy, it uses a Termination Policy to determine which instance to. For more information, see Suspending and resuming scaling processes in the Amazon EC2 Auto Scaling User. m3. I'm using Terraform to create an AWS autoscaling group, and it successfully launches an EC2 via a launch template, also created by the same Terraform plan. How to refresh AWS Autoscaling Group using Boto3 after increase instances? 1. On Ubuntu, you could set this up to happen in 55 minutes using:This is the README file for using sample orchestration scripts to automatically enroll Linux-based cloud instances to Centrify Identity Platform or to automatically join the instance to Active Directory. The maximum time, in seconds, that can elapse before the lifecycle hook times out. The instance is in an auto-scaling group that runs a REST web service, so there are most likely requests. cd back to your correct file then apply the changes and type yes. See moreYou can suspend and resume individual processes or all processes. Delete your Auto Scaling group. But, when the EC2 is a part of autoscaling group it goes down sometimes. Scale out by one instance if average CPU usage is above 70%, and scale in by one instance if CPU usage falls below 50%. ”. Create a security group that allows traffic from the internet and associate it with the Auto Scaling group instances. There’s no need to build our own AMI unless the software installation takes too long. Description ¶. First, enter a. Amazon EC2 Auto Scaling is designed to automatically launch and terminate EC2 instances based on user-defined scaling policies, scheduled actions, and health checks. m3. Scaling an Amazon EC2 Auto Scaling group based on Amazon Simple Queue Service (Amazon SQS) is a commonly used design pattern in decoupled applications. x solution At a high level, our solution includes four parts: An ASG to manage EC2 instances. Navigate to your EC2 Dashboard and find the EC2 instance you want to automatically shut down. Posted On: Aug 20, 2021. Amazon EC2 Auto Scaling now lets you control which instances to terminate during a scale-in event by allowing you to provide a custom function that selects which instances to terminate. Amazon EKS managed node groups create and manage Amazon EC2 instances for you. Create or edit a deployment group to include the Auto Scaling group. The instance remains in this state until you exit the standby state. I have an EC2 autoscaling group which will initially be set to 0, after a manually run process an SSM document is triggered which sets the ASG to 3, however I need each instance to be fully up and running before the next of the 3 is started launching. The only difference between an On-Demand Instance and a Spot Instance is that a Spot Instance can be interrupted by Amazon EC2 with two minutes of notification when EC2 needs the. Select the instance and choose Instance state, Stop instance. My cfn-init script signals back too early. AbstractAmazonAutoScalingAsync. The aws-node-termination-handler (NTH) can operate in two different modes: Instance Metadata Service (IMDS) or the Queue Processor. Create an Amazon EC2 Auto Scaling policy that uses target tracking scaling policies or step scaling policies. While EC2 Auto Scaling provides more flexibility, AWS Auto Scaling delivers simplicity. Right click on the instance you want to work with and choose Create image. What I tried so far: - Created an ECS task. The health status of the instances in your Auto Scaling group indicates whether they are healthy or unhealthy. Both maintaining the number of instances in an Auto Scaling. I am now trying to add a warm pool to the ASG (warm_pool block in the API). The instance will shut down when the graceful shutdown process exits. An Auto Scaling group contains a collection of EC2 instances that are treated as a logical grouping for the purposes of automatic scaling and management. autoscaling_group modules can, instead of specifying all parameters on those tasks, be passed a Launch Template which contains settings like instance size,. 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. When you launch the new Auto. Previously, you could use one of the predefined termination policies to determine which instances Auto Scaling would terminate. run "kubectl drain xxx"; 2. Select the group of the instance that you want to reboot. Clean up tutorial resources. This is normal behavior but sometimes there are use cases when you might need to run. Here we looked at using Launch Templates and Auto Scaling Groups to achieve the same result. Call the group ASG-SQS. Today we are announcing that Karpenter is ready for production. Create an Amazon EC2 Auto Scaling group. g UserData in Linux) with AWS EC2 CLI commands to associate an Elastic IP address you have allocated to your account writing a command. In the scenario when an equal number of instances are there in multiple availability zones, Auto Scaling group selects the Availability Zone with the instances that use the oldest launch. AutoScalingGroup class. The green circle indicates that the Gitlab Runner is ready for use. Rather than asking the Amazon EC2 service to terminate an instance, you can simply call the Operating System and tell it to Stop the instance:. Workspaces on the standard pricing plan use standard autoscaling. In the Details tab, choose Launch configuration, then click Edit. Select the check box next to the Auto Scaling group that you just created. 0put a # in front of tags then hit “esc” “:wq”. Whenever your application needs to scale out, the Auto Scaling group can draw on the warm pool to meet its new desired capacity. For information about viewing this limit, see DescribeAccountLimits . 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. aws ec2 stop-instances --instance-ids i-1234567890abcdef0 --hibernate. The goal of describing the manual process is to help users better understand the solution so they can modify the code to suit specific needs. This can lead to higher costs that can often be avoided with proper planning and. With the instance still selected, choose Actions , Instance settings, Change instance type. All instances in your Auto Scaling group start with a Healthy status. AWS Auto Scaling groups (ASGs) let you easily scale and manage a collection of EC2 instances that run the same instance configuration. . Specifying -Select '*' will result in the cmdlet returning the whole service response. 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. 2. Installs in minutes using CloudFormation or Terraform. For more information, see the Amazon EC2 Auto Scaling User Guide and the Amazon EC2 Auto Scaling API Reference. Select your Auto Scaling group and click on the Scaling. You are logged off the instance and the instance shuts down. aws. I'll introduce the resources that you need one by one. Run the scripts/cleanup. Select Launch Template, and choose the. In certain cases, GitHub cannot guarantee that jobs are not assigned to persistent runners while they are shut down. I can cover Presto/Trino cluster setup on AWS EC2 autoscaling group in a separate post. 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. autoscale. The amazon. This only put scale-in protection for new instances and not on the instances already inservice. The first step in this project would be to manually launch 3 EC2 instances. aws autoscaling delete-auto-scaling-group --auto-scaling-group-name my-asg --force-delete. I am guessing you have put Instance scale-in protection from autoscaling group -> Advanced configurations. To create an Auto Scaling group, open the Auto Scaling groups page of the Amazon EC2 console and choose Create Auto Scaling group. We demonstrated the ElastiCache for Redis new auto scaling feature using a Python script to simulate a high load on our cluster where the cluster must scale up using our configured auto scaling policy to meet the demand. For more information, see IAM role for applications that run on Amazon EC2 instances. 26. The autoscaling guide mentions that when a scale-in policy is met an EC2 is picked and terminated. 25. You are logged off the instance and the instance shuts down. Actually it happens very often, almost once a day. A warm pool is a pool of pre-initialized EC2 instances that sits alongside an Auto Scaling group. This script installs Python packages and starts a Python web server on the instance. ElastiCache for Redis Auto Scaling is limited to the following: Redis (cluster mode enabled) clusters running Redis engine version 6. For more information, see Deleting your Auto Scaling infrastructure in the Amazon EC2 Auto. The range is from 30 to 7200 seconds. 4. Please note that this will only work when creating a new Auto Scaling Group. When instances reach a wait state, Amazon EC2 Auto Scaling sends a notification. (Auto Scaling implemented) Is there a possibility for the Fargate task to exit gracefully (to complete all the processes within the task before shutting it down)?No (but Yes). On the navigation bar at the top of the screen, choose the Region where the load balancer was created. Amazon EC2 Spot Instances are spare compute capacity in the AWS Cloud available to you at steep discounts compared to On-Demand Instance prices. Lifecycle hooks enable you to perform custom actions by pausing instances as an Auto Scaling group launches or terminates them. For that you need two components: aws_launch_template; aws_autoscaling_group; Thus, instead of your "my-ec2-instance your would create corresponding aws_launch_template. In the EC2 console, scroll to the bottom of the left menu to select “Auto Scaling Groups,” then click “Create auto scaling group. Gets information about the Auto Scaling groups in the account and Region. Example 2: To hibernate an Amazon EC2 instance. For information, see Monitoring Deployments with Amazon CloudWatch Tools. AWS CLI is installed and configured with a valid AWS account with permission to deploy the autoscaling group and application load balancer. 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. You can automatically scale your cluster horizontally by adding or removing shards or replica nodes. Auto Scaling lifecycle hooks. The script spawns 40 processes and iterates over a loop to insert random keys, so the shard slots are evenly utilized. If an instance is unhealthy, Amazon EC2 Auto Scaling will replace it regardless of which feature you use (unless you suspend the ReplaceUnhealthy process). Instance sizes - Large, XLarge, 2XLarge. EC2 can also be found in services under the “ Compute ” submenu. Click on the check box associated with the Auto Scaling group you want to update. service file into the. Can that be accomplished with boto? There must be some relation between the ASG and the instances as boto has the shutdown_instances method within the boto. Uses tagging to avoid launch configuration changes. Install and configure Jenkins. For more information, checkout this AWS tutorial located here. Termination policies define the termination criteria that is used by Amazon EC2 Auto Scaling when choosing which instances to terminate. For Auto Scaling group name, enter a name for your Auto Scaling group. To follow this guide you need to have the following. ) Make sure there is at least 1 instance in the Auto Scaling group. Amazon EC2 Auto Scaling lifecycle hooks are powerful mechanisms providing the ability for your architecture to respond to Auto Scaling events. I’m performing terraform apply, that destroys and creates a new ec2 instance. 7 onwards. This operation cannot be called on instances in a warm pool. If you specify filters, the output includes information for only those Auto Scaling. You have got something called Lifecycle Hooks that lets you perform custom actions as an Autoscaling group launches or terminates. Reserve capacity only when you really need to. Is it possible to write such script. ECS also supports different deployment options, including rolling. Built-in scaling recommendations – AWS Auto Scaling provides scaling strategies with recommendations that you can use to optimize for performance, costs, or a balance between the two. 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. Lightsail doesn't support Auto Scaling. 0What I'd like to achive from AWS is this: 1. If the group has instances or scaling activities in progress, use the delete-auto-scaling-group command with the --force-delete option. Create a security group for your Amazon EC2 instance. For example, you can change the Amazon Machine Image (AMI) for an Auto Scaling group at any time by changing the launch template or launch configuration. The default value is ABANDON. Create, modify, and delete EC2 Launch Templates, which can be used to create individual instances or with Autoscaling Groups. You can suspend and resume individual processes or all processes. Click Edit to view the group's current configuration, including its autoscaling settings. The name of the lifecycle hook. To view scheduled scaling using the AWS CLI, run the following command. The specified instance type isn't supported in the requested Availability Zone. How autoscaling behaves. Deploy a new, error-free application revision to the deployment group. Sorted by: 119. I highly recommend placing the. Then when the group decreases, I want to ensure that every connection cleanly closes. This example updates the Availability Zones of the specified Auto Scaling group. The script will be also invoked on shutdown and termination. 1. 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. sh. Specifically the CPU.