High Availability Ec2 instance

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Step 1: Create a new launch template

A launch template contains the parameters required that an Auto Scaling group uses to launch EC2 instances.

To complete this step, go to the Amazon EC2 console and go to Launch Templates in the left pane under the Instances section.

Follow the steps in our documentation under creating a launch template for an Auto Scaling group.

In the Advanced details section of the wizard, make sure you select the IAM role you created in Part A – Step 2 of this post containing the permissions to allow the operation to succeed.

(https://docs.aws.amazon.com/autoscaling/ec2/userguide/create-launch-template.html)

Step 2: Create a new Auto Scaling group from the launch template

To finalize with the implementation, create an Auto Scaling group with these steps:

Go to Auto Scaling groups in the left pane of your Amazon EC2 console and choose Create Auto Scaling group.
Provide a unique name for your Auto Scaling group.
Select the launch template you created in the previous step.

You can configure the Auto Scaling group based on your needs by selecting the network configuration, scaling policies, and notifications in the case that Auto Scaling adds or terminates an instance. For further details, see creating an Auto Scaling group using a launch template.