Learn to work with the most fundamental services AWS offers such as DynamoDB, S3, and EC2 to create reliable and scalable systems.

Scalability & System Design for Developers

In this module, we’ll learn to work with the most fundamental services AWS offers, such as DynamoDB, S3, and EC2 to create reliable and scalable systems. Walk through getting a basic web application running in the cloud on AWS. You won’t find most of the knowledge that's shared here in the AWS docs.

The Good Parts of AWS: Cutting Through the Clutter

# Objective
- Replace explicit EC2 instances with Auto Scaling.

# Steps

- Remove `Instance` and `Instance2`.

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# Removing the explicit instances

Now that our new ASG instances are up and are serving requests through our load balancer, we can safely remove our explicit instances without causing any disruption. To do so, we just need to remove every reference to them from our `main.yml` script, and redeploy:

* The entire `Instance` resource.
* The entire `Instance2` resource.
* The entire `Targets` property from the `LoadBalancerTargetGroup` resource.
* The `Ec2TagFilters` property from the `StagingDeploymentGroup` resource.
* The `InstanceEndpoint` and `InstanceEndpoint2` outputs.

Now, let's redeploy our infrastructure by running `deploy-infra.sh`.

Scaling: Remove Instances

Objective

Steps

Removing the explicit instances