Therefore, if you want to change the launch configuration for your EC2 Auto Scaling group, you must create a launch configuration and then update your EC2 Auto Scaling group with the new launch configuration. However, you can only specify one launch configuration for an EC2 Auto Scaling group at a time, and you can't modify a launch configuration after you've created it. You can specify your launch configuration with multiple EC2 Auto Scaling groups. When you create an EC2 Auto Scaling group, you must specify a launch configuration. If you've launched an EC2 instance before, you specified the same information in order to launch the instance. When you create a launch configuration, you specify information for the instances such as the ID of the Amazon Machine Image (AMI), the instance type, a key pair, one or more security groups, and a block device mapping. This email contains the details of the terminated instance, such as the instance ID and the reason that the instance was terminated.įor more information read Getting SNS Notifications when your EC2 Auto Scaling Group Scales.Ī launch configuration is a template that an EC2 Auto Scaling group uses to launch EC2 instances. For example, if you configure your EC2 Auto Scaling group to use the autoscaling: EC2_INSTANCE_TERMINATE notification type, and your EC2 Auto Scaling group terminates an instance, it sends an email notification. Amazon SNS can deliver notifications as HTTP or HTTPS POST, email (SMTP, either plain-text or in JSON format), or as a message posted to an Amazon SQS queue. You can configure EC2 Auto Scaling to send an SNS notification whenever your EC2 Auto Scaling group scales. Amazon SNS coordinates and manages the delivery or sending of notifications to subscribing clients or endpoints. ![]() ![]() When you use Amazon EC2 Auto Scaling to scale your applications automatically, it is useful to know when EC2 Auto Scaling is launching or terminating the EC2 instances in your EC2 Auto Scaling group. ![]() ![]() Q: How do I know when EC2 Auto Scaling is launching or terminating the EC2 instances in an EC2 Auto Scaling group? Amazon EC2 Auto Scaling enables you to run your Amazon EC2 fleet at optimal utilization. If you have predictable load changes, you can use Predictive Scaling policy to proactively increase capacity ahead of upcoming demand. You can also use Amazon CloudWatch to send alarms to trigger scaling activities and Elastic Load Balancing (ELB) to distribute traffic to your instances within the ASG. For example, you can set a condition to add new Amazon EC2 instances in increments to the ASG when the average utilization of your Amazon EC2 fleet is high and similarly, you can set a condition to remove instances in increments when CPU utilization is low. You can use Amazon EC2 Auto Scaling to automatically scale your Amazon EC2 fleet by following the demand curve for your applications, reducing the need to manually provision Amazon EC2 capacity in advance. This ensures that your application has the compute capacity that you expect. Whether you are running one Amazon EC2 instance or thousands, you can use Amazon EC2 Auto Scaling to detect impaired Amazon EC2 instances, and replace the instances without intervention. Q: What are the benefits of using Amazon EC2 Auto Scaling?Īmazon EC2 Auto Scaling helps to maintain your Amazon EC2 instance availability. AWS Auto Scaling can help you configure dynamic scaling policies for your existing EC2 Auto Scaling groups. You should also use EC2 Auto Scaling if you need to create or configure Amazon EC2 Auto Scaling groups, or if you need to set up scheduled or step scaling policies (as AWS Auto Scaling supports only target tracking scaling policies).ĮC2 Auto Scaling groups must be created and configured outside of AWS Auto Scaling, such as through the EC2 console, Auto Scaling API or via CloudFormation. You should use EC2 Auto Scaling if you only need to scale Amazon EC2 Auto Scaling groups, or if you are only interested in maintaining the health of your EC2 fleet. It’s also easier, as AWS Auto Scaling includes predefined scaling strategies that simplify the setup of scaling policies. Using AWS Auto Scaling to configure scaling policies for all of the scalable resources in your application is faster than managing scaling policies for each resource via its individual service console. AWS Auto Scaling lets you define dynamic scaling policies for multiple EC2 Auto Scaling groups or other resources using predefined scaling strategies. You should use AWS Auto Scaling to manage scaling for multiple resources across multiple services. When should I use Amazon EC2 Auto Scaling vs.
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