Create a 3 Tier Application

This is a step-by-step rundown on how you can use TotalCloud to deploy a 3 Tier Application. The AWS services used as part of this workflow include Elastic Compute Cloud (EC2), Auto Scaling Group, Virtual Private Cloud(VPC), The Internet Gateway, Elastic Load Balancer (ELB), and EC2 Security Groups.

Step 1: Setup the Virtual Private Cloud (VPC) Give your VPC a name and a CIDR block of 10.0.0.0/16 Action Node:

• EC2 Create VPC

Step 2: Create 4 Subnets

The subnet is a way for us to group our resources within the VPC with their IP range. A subnet can be public or private. For our setup, we shall be creating the following subnets with the corresponding IP ranges.

• demo-public-subnet-1 | CIDR (10.0.1.0/24)

• demo-public-subnet-2 | CIDR (10.0.2.0/24)

• demo-private-subnet-3 | CIDR (10.0.3.0/24)

• demo-private-subnet-4 | CIDR(10.0.4.0/24)

Action Nodes:

• EC2 Create Subnetx4

Step 3: Setup the Internet Gateway

The Internet Gateway allows communication between the EC2 instances in the VPC and the internet.

Action Nodes:

• EC2 Create Internet Gateway

Step 4: Attach the VPC to the Internet Gateway

Action Nodes:

• EC2 Attach Internet Gateway

Step 5:Create Two Route Tables

The route tables are a set of rules that dictates the movement of data within the network. For our architecture, we create two route tables, one private and one public.

The public route table will define which subnets that will have direct access to the internet while the private route table will define which subnet goes through the NAT gateway.

Action Nodes:

• EC2 Create Route Tablex2

• EC2 Create Route

• EC2 Create Associate Route Tablex4

Step 6: Create Elastic Load Balancer

The idea of the load balancer is to allow the distribution of load across the EC2 instances used for the application.

Action Nodes:

• ELBv2 Create Load Balancer

Step 7: Create and Modify the Target Group

We need to configure our Target Group to have the Target type of instance. We will give the Target Group a name that will enable us to identify it. This will be needed when we will create our Auto Scaling Group.

• ELBv2 Create Target Group

• ELBv2 Modify Target Group Attributes

• ELBv2 Create Listener

Step 8: Auto Scaling Group

Auto Scaling Group can automatically adjust the size of the EC2 instances serving the application based on need. This makes it a better approach than directly attaching the EC2 instances to the load balancer.

Action Nodes:

• AutoScaling CreateLaunch configuration

• Create Auto Scaling Group

Step 9: Create an RDS DB Instance Action Nodes:

• RDS Create DB Subnet

• RDS Create DB Instance

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