Step 4: Increase the number of Amazon EC2 instances in the Auto Scaling group

In this step, you instruct the Auto Scaling group to create an additional Amazon EC2 instance. After Amazon EC2 Auto Scaling creates the instance, CodeDeploy deploys your revision to it.

To scale out the number of Amazon EC2 instances in the Auto Scaling group (CLI)

1. Call the update-auto-scaling-group command to increase the Amazon EC2 instances in the Auto Scaling group named CodeDeployDemo-AS-Group from one to two.

   On local Linux, macOS, or Unix machines:

   aws autoscaling update-auto-scaling-group \
     --auto-scaling-group-name CodeDeployDemo-AS-Group \
     --min-size 2 \
     --max-size 2 \
     --desired-capacity 2

   On local Windows machines:

   aws autoscaling update-auto-scaling-group --auto-scaling-group-name CodeDeployDemo-AS-Group --min-size 2 --max-size 2 --desired-capacity 2

2. Make sure the Auto Scaling group now has two Amazon EC2 instances. Call the describe-auto-scaling-groups command against CodeDeployDemo-AS-Group:

   aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names CodeDeployDemo-AS-Group --query "AutoScalingGroups[0].Instances[*].[HealthStatus, LifecycleState]" --output text

   Do not proceed until both of the returned values show Healthy and InService.

To scale out the number of Amazon EC2 instances in the deployment group (console)

1. In the Amazon EC2 navigation bar, under Auto Scaling, choose Auto Scaling Groups, and then choose CodeDeployDemo-AS-Group.

2. Choose Actions, and then choose Edit.

3. On the Details tab, in the Desired, Min, and Max boxes, type 2, and then choose Save.

4. Choose the Instances tab. The new Amazon EC2 instance should appear in the list. (If the instance does not appear, you may need to choose the Refresh button a few times.) Do not proceed until the value of InService appears in the Lifecycle column and the value of Healthy appears in the Health Status column.