Best Practices for AWS EC2 Auto Scaling Configuration

Key Points

• AWS EC2 Auto Scaling is a powerful feature that allows the number of EC2 instances in the infrastructure to be automatically adjusted according to requirements. It contains three main components: a launch template, an auto-scaling group, and a scaling strategy.
• Setting up auto-scaling involves creating a startup template, using the startup template to create an auto-scaling group, and configuring a scaling policy. The AWS CLI can be used to create these components. Monitoring and testing settings are critical to ensuring they work as expected.
• Automatic scaling provides several advantages, including ensuring the right computing power, cost-effectiveness, and enhancing application availability and fault tolerance. It can be used with a variety of AWS services and automatically scales for no additional charge.

Amazon Web Services (AWS) provides a wide range of cloud computing services, including Elastic Compute Cloud (EC2) for scalable computing resources. EC2 Auto-Scaling is a powerful feature that allows you to automatically adjust the number of EC2 instances in your infrastructure as needed. In this tutorial, we will cover the basics of AWS EC2 auto-scaling and provide step-by-step instructions on how to set it up.

Content:

1. Introduction to AWS EC2 Auto-Scaling
2. EC2 automatic scaling prerequisites
3. Create EC2 launch template
4. Create an automatic scaling group
5. Configure scaling policy
6. Monitoring and testing
7. EC2 Automatic telescopic cheat sheet

Introduction to AWS EC2 Automatic Scaling

EC2 Autoscaling helps you maintain the best number of instances in your infrastructure by automatically scaling up or down based on your needs. This ensures that you have enough resources to handle traffic spikes and reduce costs by freeing unwanted instances during low demand.

EC2 automatic scaling includes three main components:

• Startup template: Specify the instance type, AMI, and other settings configuration templates for the instance to be launched.
• Auto-scaling group: Instance group that shares the same startup template and scaling policy.
• Scaling strategy: Rules for determining when and how to extend the number of instances in an autoscaling group.

EC2 Automatic Scaling Prerequisites

Before you start, make sure you have the following:

• A AWS account with the necessary permissions to create and manage EC2 instances, launch templates, and autoscaling groups.
• AWS CLI with AWS credentials installed and configured.
• Basic knowledge of AWS EC2 and its components.

Create EC2 launch template

The startup template is a reusable configuration that specifies the settings for instances launched in the autoscaling group. To create a launch template, follow these steps:

1. Login to the AWS Management Console and navigate to the EC2 dashboard.
2. In the menu on the left, click Launch Template under Instance.
3. Click the Create Launch Template button.
4. Fill in the required fields such as template name, description, and Amazon Machine Image (AMI) ID. You can find the AMI ID by searching for the instance type you want in the instance section of the EC2 dashboard.
5. Select instance type according to your needs, such as t2.micro or m5.large.
6. Configure other settings as needed, such as storage, security groups, and key pairs.
7. Click Create Launch Template to save your configuration.

You can also create a launch template using the AWS CLI using the following command:

<code>aws ec2-template --launch-template-name MyLaunchTemplate --version-description "Initial version" --launch-template-data '{"ImageId":"ami-0c94855ba95b798c7","InstanceType":"t2.micro","KeyName":"my-key-pair"}'</code>

Replace the values ​​of ImageId, InstanceType, and KeyName with the settings you want.

Create an automatic scaling group

The auto-scaling group is a collection of instances that share the same startup template and scaling policy. To create an autoscaling group, follow these steps:

1. In the AWS Management Console, navigate to the EC2 dashboard.
2. In the menu on the left, click the auto-scaling group under Auto-scaling.
3. Click the Create AutoScaling Group button.
4. Select the launch template you created earlier and click Next.
5. Select a name for your autoscaling group and configure the required VPC and subnet.
6. Sets the minimum number of instances required, maximum number of instances, and required number of instances for the automatic scaling group.
7. Configure any other settings as needed, such as load balancing and health checks.
8. Click to create autoscaling group to save your configuration.

You can also use the following command to create an autoscaling group using the AWS CLI:

<code>aws Auto Scaling create-auto-scaling-group --auto-scaling-group-name MyAuto ScalingGroup --launch-template "LaunchTemplateName=MyLaunchTemplate" --min-size 1 --max-size 3 --desired-capacity 2 --vpc-zone-identifier "subnet-12345678,subnet-abcdefgh"</code>

Replace the values ​​of LaunchTemplateName, min-size, max-size, desired-capacity, and vpc-zone-identifier with the settings you need.

Configure scaling policy

Scaling strategy determines when and how to extend the number of instances in the autoscaling group. There are three types of scaling strategies:

• Target tracking scaling: Automatically adjust the number of instances based on predefined metrics such as average CPU utilization or network traffic.
• Stair Retracting: Increase or decrease the number of instances in a step-by-step manner according to CloudWatch alerts.
• Simple Scaling: Increase or decrease the number of instances based on a single CloudWatch alert.

In this tutorial, we will focus on the target tracking scaling strategy.

To create a target tracking scaling policy, follow these steps:

1. In the AWS Management Console, navigate to the EC2 dashboard.
2. In the menu on the left, click the auto-scaling group under Auto-scaling.
3. Select your auto-scaling group and click the Scaling Policy tab.
4. Click the Create Scaling Policy button.
5. Select the target tracking scaling policy as the policy type.
6. Enter a name for the scaling policy.
7. Select a predefined metric (such as average CPU utilization or request count per target) and set the target value.
8. Configure any other settings as needed, such as cooldown time and instance warm-up time.
9. Click Create to save your scaling policy.

You can also use the AWS CLI to create a target tracking scaling policy using the following command:

<code>aws ec2-template --launch-template-name MyLaunchTemplate --version-description "Initial version" --launch-template-data '{"ImageId":"ami-0c94855ba95b798c7","InstanceType":"t2.micro","KeyName":"my-key-pair"}'</code>

Replace the values ​​of policy-name, auto-scaling-group-name, PredefinedMetricType, and TargetValue with the settings you want.

Monitoring and testing

When setting up the auto-scaling group and scaling policy, be sure to monitor and test your configuration to make sure it works as expected.

To monitor your autoscaling group, you can use Amazon CloudWatch to track metrics such as CPU utilization, network traffic, and instance count. You can also set up CloudWatch alerts to notify you when a certain threshold is exceeded.

To test your autoscaling configuration, you can simulate traffic peaks or resource usage increases and observe how your autoscaling group responds. You can also manually adjust the required capacity of the autoscaling group to see how it scales up or down.

Conclusion

In this tutorial, we introduce the basics of AWS EC2 auto-scaling, including creating startup templates, auto-scaling groups, and scaling policies. By implementing autoscaling in your infrastructure, you can ensure you have enough resources to handle traffic spikes and reduce costs by freeing up unwanted instances during low demand.

(Subsequent content, such as EC2 automatic scaling cheat sheet and FAQ, is omitted here due to space limitations. You can add it yourself as needed.)

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