# Step 4: Increase the number of Amazon EC2 instances in the Auto Scaling group
<a name="tutorials-auto-scaling-group-scale-up"></a>

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.

**Topics**
+ [To scale out the number of Amazon EC2 instances in the Auto Scaling group (CLI)](#tutorials-auto-scaling-group-scale-up-cli)
+ [To scale out the number of Amazon EC2 instances in the deployment group (console)](#tutorials-auto-scaling-group-scale-up-console)

## To scale out the number of Amazon EC2 instances in the Auto Scaling group (CLI)
<a name="tutorials-auto-scaling-group-scale-up-cli"></a>

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
   ```

1. 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)
<a name="tutorials-auto-scaling-group-scale-up-console"></a>

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

1. Choose **Actions**, and then choose **Edit**.

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

1. 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.