![]() The AWS documentation describes an ASG as To start the wizard which guides the creation of the ASG, click on the "Create Auto Scaling group" link. Once the template is valid, you will see a success message similar to the one shown below. If you have an invalid template, be sure to verify you have selected the proper values for those settings. A common source of invalid templates is the combination of selected security groups and subnets. Select "Don't include in launch template"Īfter completing the form, click the "Create launch template" button to validate and save the template. Any settings not called out specifically can be left as the default. I've listed the relevant settings by section below. Start the Launch Template wizard by selecting an existing instance and choosing Actions | Image and templates | Create template from instance menu options. To create a launch template from an existing EC2 instance, navigate to the EC2 services console and click on the "Instances" link. Whenever an ASG needs to scale-out and create a new EC2 instance, the instance is configure using the settings from the launch template. Launch Templates are used when scaling EC2 instances with ASG. It includes the ID of the Amazon Machine Image (AMI), the instance type, a key pair, security groups, and other parameters used to launch EC2 instances. specifies instance configuration information. Step 1: Create a Launch Template from an EC2 instanceįrom the AWS documentation, a launch template It assumes you have a general working knowledge of each of these AWS services.Įmploying this method to scale-out and scale-in EC2 instances on a schedule can be broken down into three steps:Ĭreate a Launch Template from an EC2 instance ![]() This post focuses on setting up Launch Templates and ASGs. More information about the use cases for each solution can be found in the previous post. This solution uses the ASG's ability to scale-out and scale-in on a schedule. ![]() ![]() Launch Templates, in conjunction with Auto Scaling Groups (ASG), provide another solution which achieves the same result. In my previous post I described a method for starting and stopping EC2 instances on a schedule using CloudWatch Event Rules and Lambdas. Shutting down EC2 instances when they are not in use is an effective way to manage cloud costs. ![]()
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