C. The Lambda functions that run during any hook can perform validation tests or gather traffic metrics. It's free to sign up and bid on jobs. So, we turn to a relatively unknown addition to ASGs, the Lifecycle Hook. If you specify multiple instances and the request fails (for example, because of a single incorrect instance ID), none of the instances are terminated. SSM, SQS, cloudwatch to trigger something and that will execute my powerhshell script. In this state, you can access instances before they're terminated, and then troubleshoot why they were marked as unhealthy. 2. but I cannot see any hooks via the API. Run backup scripts on Amazon EC2 in an Auto Scaling group. Lambda execution environment. ; The machine is now in a state Terminate-Wait, this means it's still not terminated and that's what enables us to run the PowerShell script ; The Lambda subscribing to the Topic receives a message. To find out the current run level you can execute $ runlevel command. Create a virtual private network (VPC) 2. Part II: Setting Up AWS CodeDeploy/CodePipeline to Automate the Deployment of a Node Web Service. If you need more time, record the lifecycle action heartbeat to keep the instance in a wait state using the RecordLifecycleActionHeartbeat API call. Amazon ECR supports private repositories with resource-based permissions using AWS IAM. To delete the lifecycle hook. Step 3: Check your results. If you choose CONTINUE, the Auto Scaling group can proceed with any other lifecycle hooks and then put the instance into. 8. start. `) }) </script>. My idea to accomplish that is to: Use autoscaling module with an initial lifecycle hook that sets up a transition state to autoscaling:EC2_INSTANCE_TERMINATING when removing old ASG and creating new ASG on deploy. Lifecycle hooks support a metadata field that can be used to embed information specific to the hook in the message. On the Instance management tab, in Lifecycle hooks, choose the lifecycle hook (TestAutoScalingEvent-hook). It's free to sign up and bid on jobs. Lifecycle preStop Hook Common Mistakes. What it means is I have to create a on-start. It's free to sign up and bid on jobs. We can create Lifecycle by AWS Console and AWS CLI method. 238; asked May 9, 2018 at 5:21. yml located at the revision root) file to run. The "scripts" property of your package. To see the events I had to create a log group and then set up a rule with a cloudwatch target. For example, when you stop an instance, the root device and any other devices attached to the instance persist. 30m). EC2 Instance-terminate Lifecycle Action. premyscript, myscript,. Change the user in the CodeDeploy agent configuration file by running the following sed stream editor command:Let’s walk through the example CDK-based project that will: 1. By default, AMIs created by the schedule are automatically tagged with the ID of the source instance. To run ipconfig from the AWS Systems Manager Run Command: $ aws ssm send-command --document-name "AWS-RunPowerShellScript" --instance-ids "<your instance id>" --parameters commands=ipconfig. These instances start in the Pending state. The runas is optional, however, think of it as who the instance should run/install the script as i. . Create the lifecycle hook. This notification can come from sources such as Amazon EC2, Elastic Load Balancing, VPC Lattice, or custom health checks. The deployed solution lets you schedule and orchestrate backups across multiple AWS resources, manage their. The following are descriptions of each of the task lifecycle states. yml to delete the temporary files. Create an AWS Systems Manager document with a script to copy log files to Amazon S3. In this section, you implement one Lambda function for your Amazon ECS deployment's AfterAllowTestTraffic hook. To create an AWS AutoSacling lifecycle hook, you can use the aws_autoscaling_lifecycle_hook resource and. In this step, we are going to create an SSM document to run a shell script on the EC2. Documentation Amazon EC2 Auto Scaling How lifecycle hooks work PDF RSS An Amazon EC2 instance transitions through different states from the time it launches until it is terminated. If an instance is already in a wait state, you can prevent the lifecycle hook from timing out by recording a heartbeat, using the record-lifecycle-action-heartbeat CLI command. The ASG based on a defined scaling activity decides to terminate a machine. For more information, see Create EventBridge rules for instance refresh events. To create a lifecycle hook, you need to specify the following information: Auto Scaling group. You could invoke a script to wait for a fixed amount of time and then let the app exit. 1. You can prevent the lifecycle hook from timing out by calling RecordLifecycleActionHeartbeat. Step 5: Check your results again. If the pool state is set to Running, then this state is Warmed:Running instead. aws ec2 run-instances --image-id ami-1a2b3c4d --instance-type t2. json file supports a number of built-in scripts and their preset life cycle events as well as arbitrary scripts. In the Lambda function, assign a network interface to an AWS. There's a GitHub repository which has samples that you can use. Move to the Auto Scaling group’s Lifecycle Hooks tab and click the Create Lifecycle Hook button. After deploying with kubectl apply -f manifest. Pre and post commands with matching names will be run for those as well (e. Create the lifecycle hook. A split pane opens up in the bottom part of the Auto Scaling groups page. Select Services in the top bar and click EC2 to launch the EC2 Management Console. The Task has a PowerShell script that extracts the user names in the OU to a. In the Tagging section, do the following:. And in your user data, you can easily use the CLI to control the hook, check this out. 5. We utilize an autoscaling lifecycle hook to achieve these goals. I'm looking for a script to dynamically call the AWS API put-bucket-lifecycle-configuration and parse through a list of all 200+ buckets automatically so I don't need to manually change the bucket names in the command. Configure CloudWatch Events to invoke the Lambda function. edited Apr 21, 2020 at 20:23. Scripts can pause and resume I/O. Use Amazon SNS to notify administrators with backup activity metadata. When the heartbeat times out you can set the default action to ABANDON to terminate the instance and launch a new one, or set it. json. AfterInstall (a hook for Lambda functions) Run Lambda functions. How Amazon EC2 Auto Scaling works with CodeDeploy. In the detail object, the values for the Origin and Destination attributes show where the instance is coming from and where it's going. When a scale-in event occurs, a lifecycle hook pauses the instance before it is terminated and sends you. If you're hesitant to trigger a script via lifecycle hooks then you will need to script this action. There is no. The following is the typical workflow for using lifecycle configuration in your apps: Write the script. e root or a different IAM user. This page describes the lifecycle of a Pod. If these checks fail repeatedly, AWS might terminate the instance. Create the lifecycle hook. terminate-instances module. /pid. Note: If you've got the error, consider specifying the right --region. When an instance is set to terminate, ASG triggers the hook, cloudwatch event is sen. Use return statements in your function to add outputs to your. Sorted by: 119. In the detail object, the values for the Origin and Destination attributes show where the instance is coming from and where it's going. 6 Answers. This way, you are notified when you can run the required verifications. You can stop, start, and terminate EBS-backed instances. Before continuing on this guide, please. Let's say that your app needs a configuration (config. Skipped: The deployment lifecycle event has been skipped. Action examples are code excerpts from larger programs and must be run in context. The aws-node-termination-handler (NTH) can operate in two different modes: Instance Metadata Service (IMDS) or the Queue Processor. resource "aws_autoscaling_lifecycle_hook. AWS CodeDeploy is a new service that makes it easy to deploy application updates to Amazon EC2 instances. The domain-join script runs on the instance. EC2 Instance-terminate Lifecycle Action. If you didn't add a lifecycle hook to your Auto Scaling group, Amazon EC2 Auto Scaling starts terminating the previous instances as soon as the new instances pass their health check. To have an instance terminate itself do both of these steps: Start the instance with --instance-initiated-shutdown-behavior terminate or the equivalent on the AWS console or API call. Amazon EC2 Auto Scaling will not tell Amazon EC2 to terminate the instance until it receives a CompleteLifecycleAction call or the timeout elapses, whichever happens first. This is really important. Alternatively, you can simply follow the AWS docs to create an SQS queue named lifecycle-manager-queue, a notification role, and a lifecycle-hook on your autoscaling group pointing to the created queue. Update EC2 instance IAM role To delete the lifecycle hook. In fact, a hook can be controlled from any supported language or scripting language. Define an Amazon CloudWatch Events target, an AWS Lambda function, and a lifecycle hook attached to the Auto Scaling group. Create the lifecycle hook. ECR (Elastic Container Registry) ECR Public. Then copy the code into the Function code field. Selecting CodeDeploy grants the CodeDeploy the ability to call other AWS services on your behalf. Provide the lifecycle hook name, select lifecycle transition as Instance terminate, keep the default Heartbeat Timeout value which is 600 and click Continue. You can see this action in context in the following code example: Get started with instances. Download the template from here or. Create an SSM document to run a shell script that does S3 operations inside the EC2. Open the Auto Scaling groups page of the Amazon EC2 console. As the instance is launched, a lifecycle hook triggers and the Auto Scaling group waits for a signal from the instance’s user data script to indicate that the application has finished installation. The ARN of the IAM role that allows the Auto Scaling group to publish to the specified notification target. Create the lifecycle hook. As an aside, you may want to use the AfterInstall lifecycle hook to run npm install just for organization purposes, but it will have no functional different. When necessary, you can extend the platforms in several ways to configure options, install software, add files and start-up commands, provide build and runtime instructions, and add initialization scripts that run. Next, we’ll put the lifecycle hook on the Auto Scaling group. Select the check box next to your Auto Scaling group. aws-lambda-lifecycle-hooks-function Using Auto Scaling lifecycle hooks, Lambda, and EC2 Run Command Introduction. Updated ApplicationStart scripts:. The memory usage for your function is determined per-invoke and can be viewed in Amazon CloudWatch. Follow. You can. . Create a launch script for instances which will do the following. If you need more time, record the lifecycle action heartbeat to keep the instance in a wait state using the RecordLifecycleActionHeartbeat API call. This ensures that they persist when you stop and restart the notebook instance, and that any external libraries you install are not updated by SageMaker. If you added a lifecycle hook, this extends the amount of time it takes before we start terminating the previous instances by the timeout value you specified for. Create a Lambda function; Create an event to trigger the Lambda function using Eventbridge. To learn more, visit the Amazon Data Lifecycle Manager documentation. In my case, I was trying to define a termination hook to give ECS time to launch new containers on new instances before terminating the old. Add the commit ID of the app version you want to deploy. Option 2: If manually taking care of lifecycle hooks doesn't appeal to you, then I would recommend scrapping your user data script and doing a work around with AWS. Auto Scaling lifecycle hooks. This is when the lifecycle hook gets activated and posts a message to SNS. Contents. aws autoscaling put-lifecycle-hook --lifecycle-hook-name hook-name --auto-scaling-group-name asg-group-name --lifecycle-transition autoscaling:EC2_INSTANCE_LAUNCHING --notification-target-arn sns-topic. Each hook for a lifecycle event is specified with a string on a separate line. Amazon CodeDeploy is a service that automates code deployments to any instance, including Amazon EC2 instances and instances running on-premises. I want to transition instance to LAUNCHED state and trigger code deployment only after the first reboot. I have a autoscalling in AWS, that basically do: run a python process script. Create an Auto Scaling lifecycle hook that publishes a message to an. . If you need more time, record the lifecycle action heartbeat to keep the instance in a wait state using the RecordLifecycleActionHeartbeat API call. If there are any outstanding lifecycle actions, they are completed first ( ABANDON for launching instances, CONTINUE for terminating. It then pipes that output to the jq executable. A popular use of lifecycle hooks is to control when instances are registered with Elastic Load Balancing. sh script within a lifecycle configuration. By default, an instance remains in the Terminating:Wait state for 3600 seconds (1 hour). You can run them as bash script or you can pull your scripts from aws s3. An Auto Scaling instance can transition through many states as part of its lifecycle. You can find a sample template snippet in the Examples section of the AWS::AutoScaling::LifecycleHook resource. For more information, see the Amazon EC2 Auto Scaling User Guide and the Amazon EC2 Auto Scaling API Reference . If you are running tasks with RunTask you may want to create a ASG lifecycle hook and/or a Lambda function triggered by a EventBridge event to enumerate and stop the tasks running on the instance being terminated. LifecycleHookName (string) – The name of the lifecycle hook. By using EC2 Spot Instances, customers can access additional compute capacity between 70%-90% off of On-Demand Instance pricing. You are currently running with 100 Amazon EC2 instances with an Auto Scaling Group that needs to be able to share the storage layer for the. Amazon EC2 Auto Scaling User Guide Amazon EC2 Auto Scaling API Reference. F# scripts (. The following diagram shows the transition between Auto Scaling states when you use a warm pool: ¹ This state varies based on the warm pool's pool state setting. Pods follow a defined lifecycle, starting in the Pending phase, moving through Running if at least one of its primary containers starts OK, and then through either the Succeeded or Failed phases depending on whether any container in the Pod terminated in failure. If you need more time, record the lifecycle action heartbeat to keep the instance in a wait state using the RecordLifecycleActionHeartbeat API call. PDF RSS. To attach the lifecycle configuration, you must update the UserSettings for your domain or user profile, or the SpaceSettings for a shared space. Step 2. My deployment lifecycle event hook in AWS CodeDeploy calls a Windows PowerShell cmdlet that returns errors. aws autoscaling complete-lifecycle-action in aws CLI works fine, but i need to be doneA. By design, lifecycle hooks will try to run the Lambda functions to perform actions on your instances concurrently, which will make everything happen at the same time across all instances. Running script or command on EC2 instance on termination . (Optional) Create a Lambda function and a rule that allows Amazon EventBridge to invoke your Lambda function when an instance is put into a wait state due to a lifecycle hook. file & Starts your app and saves the process id in a file. Lifecycled is designed to run on an AWS EC2 instance and listen for various state change mechanisms: AWS AutoScaling. Prerequisites. 5. 0-eksbuild. What I want to do is run a script in my frontend folder, app, that builds my code. Instances start in the Pending state. Move to the Auto Scaling group’s Lifecycle Hooks tab and click the Create Lifecycle Hook button. This step is a part of the procedure for adding a lifecycle hook to an Auto Scaling group: (Optional) Create a launch template or launch configuration with a user data script that runs while an instance is in a wait state due to a lifecycle hook. Associate the lifecycle configuration to a domain or user profile. npm i -D uglifyjs-webpack-plugin@beta. anchor anchor anchor. Only resources that have the specified tag key and value pairs are backed up by the policy. The role allows Amazon EC2 Auto Scaling to publish lifecycle notifications to the target. This is a command-line package that can parse JSON. Create an AWS Systems Manager document with a script to copy log files to Amazon S3. exceptions'ec2'# Do a dryrun first to verify permissions'DryRunOperation'#. the Tin Man. When resources are deployed using autoscaling group with Terminating lifecycle hook setup, Terraform destroy command should invoke/trigger the terminating lifecyclehook and wait for the instance to be terminated before the terminating lifecyclehook is destroyed. After you have a completed AppSpec file, you bundle it, along with the content to deploy, into an archive file (zip. You can then add a lifecycle hook to the Auto Scaling group to keep the instance running until your code sends the complete-lifecycle-action command to continue. jar & echo $! > . Here is how I would try to approach this problem (this is a needs a POC, the answer is theoretical): Create an Auto Scaling Group. aws autoscaling set-desired-capacity --auto-scaling-group-name "Example Auto Scaling Group" --desired-capacity 1. I'm trying to achieve the following. GwenM. To verify the root device type of an instance, you can use the Amazon EC2 console or the AWS CLI. You can choose to either CONTINUE or ABANDON. Also, selecting the value “Instance Terminate” on the “Lifecycle transition” option means appending one listener to all events that will terminate any EC2 from this To create the Auto Scaling group with the AWS CLI, you must run the following command at the same location where you saved the preceding JSON file. The preStop hook is one of the Pod LifeCycle hooks. Hello, I have a use-case for pods that take long time to terminate gracefully (termination grace period of 60s). These are the available methods:I have a doubt about the logic of the lambda which is responsible for draining the container instance of the cluster on how to reinitiate the lambda? So, for example, there is a condition when the. On the navigation bar at the top of the screen, choose the same Region that you used when you created the Auto Scaling group. If the pool state is set to Running, then this state is Warmed:Running instead. spec. sh #!/bin/bash java -jar myapp. After you complete the lifecycle action, the. hooks: deployment-lifecycle-event-name: - location: script-location timeout: timeout-in-seconds runas: user-name Select the Auto Scaling group Instances tab; one instance state value should show the lifecycle state “Terminating:Wait”. In this example, Python code is used perform several basic instance management operations. Lifecycle arguments help control the flow of your Terraform operations by creating custom rules for resource creation and destruction. Health Checks: AWS performs system status checks and instance status checks. Instances are launched or terminated based on a target capacity metric. In other words, each Pod completion is. Auto Scaling Lifecycle hooks enable performing custom actions by pausing instances as an Auto Scaling group launches or terminates them. When the Auto Scaling. Also, selecting the value “Instance Terminate” on the “Lifecycle transition” option means appending one listener to all events that will terminate any EC2 from thisRun this command to create a lifecycle hook to control instance launching. The above file tweaks the “autoscaling:EC2_INSTANCE_TERMINATING” signal sender Lifecycle hook of the ASG to send a notification to an SNS topic and sleep for 1 hour before killing the worker. The script can retrieve the instance ID from the instance metadata and signal Amazon EC2 Auto Scaling when the bootstrap scripts have completed successfully. 3. When state=running, state=stopped or state=restarted then either instance_ids or. For this tutorial, the Lambda function returns Succeeded. . If deployments to an Amazon EC2 Auto Scaling group are failing, see if the lifecycle hook names in Amazon EC2 Auto Scaling and CodeDeploy match. 26. Provides an AutoScaling Lifecycle Hook resource. json file supports a number of built-in scripts and their preset life cycle events as well as arbitrary scripts. Maximum Instance Lifetime won't ever replace more than 10% of the total instances in an ASG at once (so in your case, never more than 1 at. Overview Analogous to many programming language frameworks that have component lifecycle hooks, such as Angular, Kubernetes provides Containers. Therefore, you can implement a preStop hook that will start the deregistration process, verify that it has completed, and only then proceed to sending the SIGTERM and terminating the pod. Create an SNS topic. Reload to refresh your session. Try to lower the number of archived deployments on your instance by updating the max_revisions setting in the CodeDeploy agent configuration. If a script runs for longer than 5 minutes, it fails and the notebook instance is not created or started. As with post-start hooks, you can either execute a command within the container or send an HTTP request to the application running in it. -2. aws autoscaling delete-auto-scaling-group --auto-scaling-group-name <asg name> --force-delete. The role allows Amazon EC2 Auto Scaling to publish lifecycle notifications to the target. I understand that you would like your Windows instance deployed by CloudFormation to run a cleanup script just before the termination. When an Auto Scaling group needs to scale in, replace an unhealthy instance, or re-balance Availability Zones, the instance is terminated, data on the instance is lost and any on-going tasks are interrupted. And I am learning kubernetes using minikube. By default, an instance can continue running for one hour (heartbeat timeout) due to a termination lifecycle hook. Give a friendly name for the Lifecycle Hook. 8. Here’s how you can do that: Go to your instance and find Permissions and encryptions. Restore EBS Volume from a EBS Snapshot. Step 2 – Create an IAM role for your instances and your Lambda function . ; The Life Cycle Hook fires, causing a message to be pushed into an SNS Topic. completionMode:. 30m). Put a lifecycle hook on this ASG like described here, sending notification to Amazon SNS. Here are descriptions of the hooks available for use in your AppSpec file. The arguments available within a lifecycle block are create_before_destroy, prevent_destroy, ignore_changes, and replace_triggered_by. To complete lifecycle hook actions using an API, make a CompleteLifecycleAction call. 1 Answer. Instead of Terraform managing operations in the built-in dependency graph, lifecycle arguments help minimize potential downtime based on your resource needs as well as protect specific. For more information, checkout this AWS tutorial located here. You can then add a lifecycle hook to the Auto Scaling group to keep the instance running until your code sends the complete-lifecycle-action command to continue. This can be the simplest example to handle pull code case. On most newer AMI's, the machines are given the equivalent to a 'halt' (or 'shutdown -h now' command so that the services are gracefully shut down. A. Registering Lifecycle Hooks. In this step, you use the AWS console to create the AWS Identity and Access Management (IAM) role for your instances and Lambda to enable them to run the SSM agent, upload your files to your S3 bucket, and complete the lifecycle hook. The following diagram shows the transition between Auto Scaling states when you use a warm pool: ¹ This state varies based on the warm pool's pool state setting. Then I found out that I can create an IAM Role, which then I. To complete lifecycle hook actions using the AWS CLI, use the command complete-lifecycle-action. Create a lifecycle configuration entity via the AWS Command Line Interface (AWS CLI). Specify whether the hook is used when the instances launch or terminate. 0). In this case, we’ll specify the resource ids of the admin subnet and security groups, which are specific to this Auto Scaling group. Option 2: Use a startup (User Data) script. Choose Actions, Delete. Each Amazon EC2 instance has a User Data field, which is accessible from the instance. These events give you an opportunity to run scripts (or hooks) as part of the deployment. Your launch template or launch configuration must specify this role using an IAM instance profile. This step is a part of the procedure for adding a lifecycle hook to an Auto Scaling group: (Optional) Create a launch template or launch configuration with a user data script that runs while an instance is in a wait state due to a lifecycle hook. --status (string) The result of a Lambda function that validates a deployment lifecycle event. Module for Termination Lifecycle Hook Lambda Function. After the instance is ready for you, it enters the running state. Register the Lambda function and subscribe to the SNS topic. Sorted by: 15. when you add a lifecycle hook in the console, Amazon EC2 Auto Scaling sends lifecycle event notifications to Amazon EventBridge. The following. Follow the steps given below to restore a snapshot to a EBS volume. Select the Deploy tab to make sure that the changes saved. Specify whether the hook is used when the instances launch or terminate. When Amazon EC2 Auto Scaling responds to a scale-out event, it launches one or more instances. CodeDeploy doesn't report a lifecycle event. Pre and post commands with matching names will be run for those as well (e. To do that, use a lifecycle configuration that includes both a script that runs when you create the. When the heartbeat times out you can set the default action to ABANDON to terminate the instance and launch a new one, or set it. We use the Amazon Machine Image (AMI) you specified at launch to boot the instance. Download the template from here or. To resolve the hook, you can use the following command: aws autoscaling complete-lifecycle-action --lifecycle-hook-name my-hook --auto-scaling-group-name. I have a autoscalling in AWS, that basically do: run a python process script. Amazon EC2 Auto Scaling lifecycle hooks are powerful mechanisms providing the ability for your architecture to respond to Auto Scaling events. This is true even if the timeout period specified in the script is shorter than an hour. autoscaling. 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. 2. Instances can remain in a wait state for a finite period of time, you set it in this command to 300 seconds using heartbeat-timeout parameter. The exit hook within the first step contains an arguments key where an array with a single object is passed. Another example can be to run a complex script, place them on s3 and pull them during scaling up. Events that are delivered when an instance transitions into a wait state for scale-out events have EC2 Instance-launch Lifecycle Action as the value for detail-type. The code uses the AWS SDK for Python to manage the instances by using these methods of the EC2 client class: unmonitor_instances. Therefore, you can implement a preStop hook that will start the deregistration process, verify that it has completed, and only then proceed to sending the SIGTERM and terminating the pod. . PDF RSS. spec. It's a notification that someone changed the lifecycle hook config, not that an actual lifecycle event happened. D. If you do this for an EC2 instance and the issue persists, consider using a larger instance. Add a lifecycle hook to your AWS Auto Scaling group to move instances in the Terminating state to the Terminating:Wait state. If your EC2 instance was terminated without completing its lifecycle action, here are some steps you can take to troubleshoot:The deployment lifecycle event status: Pending: The deployment lifecycle event is pending. Add a lifecycle hook to hold the instance in a wait state until your lifecycle action is complete. The role allows Amazon EC2 Auto Scaling to publish lifecycle notifications to the target. First, get the list of lifecycle hook names for both the Amazon EC2 Auto Scaling group and the deployment group:The amount of time, in seconds, that can elapse before the lifecycle hook times out. For AWS Lambda compute platform applications, the AppSpec file is used by CodeDeploy to determine:. Amazon EKS managed node groups automate the provisioning and lifecycle management of nodes (Amazon EC2 instances) for Amazon EKS Kubernetes clusters. If you need more time, record the lifecycle action heartbeat to keep the instance in a wait state using the RecordLifecycleActionHeartbeat API call. What happens to an instance differs if you stop it or terminate it. We call this script in the validate service lifecycle hook of the CodeDeploy project. EventBridge rule to receive the launch lifecycle hook event which invokes another lambda function which fetches the saved tag key/value & secondary ENI from the parameter store and attaches it to the newly created EC2 instance and completes the lifecycle hook action. A lifecycle hook specifies actions to perform when Amazon EC2 Auto Scaling launches or terminates instances. This particular command converts the JSON format into an export syntax for the shell. Create, terminate, start, stop or restart instances. Create the lifecycle hook. The lifecycle hook works like this: A CloudWatch event rule actively listens for the EC2 Instance-terminate events. The role allows Amazon EC2 Auto Scaling to publish lifecycle notifications to the target. You can start using these metrics through the AWS Management Console, AWS CLI, or AWS SDK. After patching is complete and the server has been rebooted, a post-patching custom script can be run to start the application and perform validation testing to ensure it is operating as. Runs the Python or PowerShell script provided using the specified runtime and handler. Specify whether the hook is used when the instances launch or terminate. 1: (Optional) Customize a Notebook Instance . • Auto Scaling group lifecycle hooks for instance launching and terminating • A CloudWatch event, to track the EC2 Instance-Launch Lifecycle-Action and EC2 Instance-terminate Lifecycle-Action events • A pointer from the CloudWatch event to the Lambda function, and the necessary permissions. js file to declare the applications/services you would like to deploy your code into by.