Multi-AZ Auto Scaling Groups

01 Sign in to the AWS Management Console.

02 Navigate to Amazon EC2 console at https://console.aws.amazon.com/ec2/.

03 In the main navigation panel, under Auto Scaling, choose Auto Scaling Groups.

04 Click on the name (link) of the Auto Scaling Group (ASG) that you want to examine.

05 Select the Details tab to access the ASG resource configuration information.

06 In the Network section, check the Availability Zones configuration attribute. If the Availability Zones attribute has just one value (e.g. us-east-1a), the selected Amazon Auto Scaling Group can launch EC2 instances within an Availability Zone (AZ) only, therefore the ASG can't take advantage of the reliability of geo-redundancy by deploying EC2 instances across multiple AZs.

07 Repeat steps no. 4 – 6 for each Auto Scaling Group available within the current AWS region.

08 Change the AWS cloud region from the navigation bar and repeat the Audit process for other regions.

01 Run describe-auto-scaling-groups command (OSX/Linux/UNIX) to list the name of each Auto Scaling Group (ASG) deployed in the selected AWS region:

aws autoscaling describe-auto-scaling-groups
  --region us-east-1
  --output table
  --query 'AutoScalingGroups[*].AutoScalingGroupName'

02 The command output should return a table with the requested ASG name(s):

---------------------------
|DescribeAutoScalingGroups|
+-------------------------+
|  cc-production-web-asg  |
|  cc-internal-data-asg   |
+-------------------------+

03 Run describe-auto-scaling-groups command (OSX/Linux/UNIX) using the name of the Auto Scaling Group (ASG) that you want to examine as the identifier parameter and custom query filters to list the names of the Availability Zones (AZs) configured for selected ASG:

aws autoscaling describe-auto-scaling-groups
  --region us-east-1
  --auto-scaling-group-names cc-production-web-asg
  --query 'AutoScalingGroups[*].AvailabilityZones[]'

04 The command output should return the requested Availability Zone identifiers (names):

[
    "us-east-1a"
]

05 Repeat steps no. 3 and 4 for each Auto Scaling Group available in the selected AWS region.

06 Change the AWS cloud region by updating the --region command parameter value and repeat the Audit process for other regions.

01 Sign in to the AWS Management Console.

02 Navigate to Amazon EC2 console at https://console.aws.amazon.com/ec2/v2/.

03 In the main navigation panel, under Auto Scaling, select Auto Scaling Groups.

04 Select the Auto Scaling Group (ASG) that you want to reconfigure.

05 Choose the Details tab to view the ASG resource configuration details.

06 In the Network section choose Edit to access the network configuration settings available for the selected ASG resource.

07 Select two or more Availability Zones (and associated subnets) from the Select Availability Zones and subnets dropdown list to set up a Multi-AZ configuration for the selected Auto Scaling Group (ASG). Once all the Availability Zones (AZs) are selected, choose Update to apply the configuration changes.

08 Repeat steps no. 4 – 7 for each ASG that you want to reconfigure, available within the current AWS region.

09 Change the AWS cloud region from the navigation bar and repeat the Remediation process for other regions.

01 Run update-auto-scaling-group command (OSX/Linux/UNIX) using the name of the Auto Scaling Group (ASG) that you want to reconfigure as the identifier parameter, to set up a Multi-AZ configuration by adding two or more Availability Zones (and associated subnets) to the selected ASG (the command does not produce an output):

aws autoscaling update-auto-scaling-group
  --region us-east-1
  --auto-scaling-group-name cc-production-asg
  --vpc-zone-identifier subnet-0abcd1234abcd1234,subnet-0abcdabcdabcdabcd,subnet-01234abcd1234abcd

02 Repeat step no. 1 for each ASG that you want to reconfigure, available in the selected AWS region.

03 Change the AWS cloud region by updating the --region command parameter value and perform the Remediation process for other regions.