Rule: Amazon EC2 Auto Scaling Group Should Cover Multiple Availability Zones
This rule requires Amazon EC2 Auto Scaling groups to be set up across multiple Availability Zones.
| Rule | Amazon EC2 Auto Scaling group should cover multiple Availability Zones |
| Framework | AWS Foundational Security Best Practices |
| Severity | ✔ Medium |
Rule Description:
To adhere to AWS Foundational Security Best Practices, it is recommended to configure your Amazon EC2 Auto Scaling group to cover multiple Availability Zones. This ensures high availability and fault tolerance for your application by distributing instances across different physical infrastructures within a specific region.
Troubleshooting Steps (if applicable):
- 1.Check if your Amazon EC2 Auto Scaling group is currently configured to use multiple Availability Zones.
- 2.Verify if the regions in which your Auto Scaling group is deployed have multiple Availability Zones.
- 3.Ensure that the desired capacity of your Auto Scaling group is properly set considering the availability zone distribution.
- 4.Confirm that the maximum size of your Auto Scaling group can accommodate instances across multiple Availability Zones.
Necessary Codes (if applicable):
There aren't any specific codes required for this configuration. However, if you are using AWS CLI or scripting tools to manage your Auto Scaling group, you may need to use the appropriate commands/APIs to make the necessary changes.
Step-by-Step Guide for Remediation:
- 1.Log in to the AWS Management Console.
- 2.Open the Amazon EC2 service.
- 3.Navigate to the "Auto Scaling Groups" page.
- 4.Select the Auto Scaling group that needs to be modified.
- 5.Click on the "Edit" button or navigate to the "Details" tab, depending on the console version you are using.
- 6.In the configuration settings, locate the "Subnet(s)" or "Availability Zones" option.
- 7.Ensure that you have selected multiple subnets or availability zones.
- 8.Save the changes and wait for the Auto Scaling group to update.
Please note that the exact steps may vary slightly depending on the version of the AWS Management Console you are using. Ensure that you have the necessary permissions to modify the Auto Scaling group configuration.
By following these steps, you will successfully configure your Amazon EC2 Auto Scaling group to cover multiple Availability Zones, enhancing the availability and fault tolerance of your application.