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Create an Auto Scaling Group
Now that you have installed the Auto Scaling CLI, you're ready to create an Auto Scaling group. You'll use the command-line tools to create a simple Auto Scaling group designed to contain exactly one EC2 instance.
First, you'll create a launch configuration that specifies the type of EC2 instance that you want Auto Scaling to create. Second, you'll create an Auto Scaling group that references your launch configuration. Finally, you'll verify that the Auto Scaling group is functioning.
Create a Launch Configuration
The launch configuration specifies the type of Amazon EC2 instance
that Auto Scaling creates for you. To create a launch configuration with
as-create-launch-config, you must specify an
Amazon Machine Image (AMI) ID and an Amazon EC2 instance type similar to the following example:
AMI ID:
ami-2272864bInstance type:
m1.large
Note
The AMI ID is provided for illustration purposes only. AMI IDs change over time. You can obtain current, valid AMI IDs by
calling the ec2-describe-images CLI command.
Create an Auto Scaling Group
After you have defined your launch configuration, you are ready to create an Auto Scaling group.
To create an Auto Scaling group with as-create-auto-scaling-group,
you must specify a name for your group, a launch configuration, one or more
Availability Zones, a minimum group size, and a maximum group size.
Name your Auto Scaling group "MyGroup" and use the launch configuration you created previously.
The Availability Zones you choose determine the physical location of your Auto Scaling
instances. For this example, specify a single zone: us-east-1a.
Set the minimum and maximum size of your Auto Scaling group to 1. Because
the minimum size of the group is 1, Auto Scaling begins creating
an EC2 instance immediately after you call as-create-auto-scaling-group.
Important
The instance you're about to launch will be live (and not running in a sandbox). You will incur the standard Amazon EC2 usage fees for the instance until you terminate it as the last task in this tutorial. The total charges will be minimal (typically less than a dollar). For more information about Amazon EC2 usage rates, go to the Amazon EC2 product page.
Verify Auto Scaling Group Creation
You can use the as-describe-auto-scaling-groups command to check
whether the MyGroup Auto Scaling group exists. Use the --headers
parameter to print headings that describe each value that the command returns.
To verify that the Auto Scaling group exists
Enter the
as-describe-auto-scaling-groupscommand.as-describe-auto-scaling-groups --headers
Auto Scaling returns the following:
AUTO-SCALING-GROUP GROUP-NAME LAUNCH-CONFIG AVAILABILITY-ZONES MIN-SIZE MAX-SIZE DESIRED-CAPACITY AUTO-SCALING-GROUP MyGroup MyLC us-east-1a 1 1 1
You can also use the as-describe-auto-scaling-instances command to check
whether the MyGroup Auto Scaling group contains any running instances. Use the --headers
parameter to print headings that describe each value that the command returns.
To verify that MyGroup contains an EC2 instance
Enter the
as-describe-auto-scaling-instancescommand.as-describe-auto-scaling-instances --headers
Auto Scaling returns the following (your
INSTANCE-IDwill differ):INSTANCE INSTANCE-ID GROUP-NAME AVAILABILITY-ZONE STATE STATUS LAUNCH-CONFIG INSTANCE i-bcdd63d1 MyGroup us-east-1a InService HEALTHY MyLC
You have a number of other options when you use as-create-auto-scaling-group,
as-describe-auto-scaling-groups, and as-describe-auto-scaling-instances.
For more information, go to the Auto Scaling API Reference.
