Subnets Demo

In this tutorial, you'll learn how to create subnets within an AWS VPC. We'll begin by creating a new VPC to host our subnets. If you're already familiar with VPC creation, feel free to jump directly to the subnet demonstration.

Step 1: Creating the VPC

First, navigate to your AWS Management Console and search for "VPC". From the search results, select the VPC service.

Next, click on VPCs and choose to create a new VPC. Select the "VPC only" option, assign a name (for this demonstration, use "demo VPC"), and specify your CIDR block as 10.0.0.0/16. If necessary, enable the Amazon provided IPv6 CIDR block. Once these details are confirmed, create the VPC.

Step 2: Creating the First Subnet

Proceed to the subnet section. Click on Create Subnet and select the VPC you just created. Name the first subnet "subnet one" and choose an availability zone—such as "US East 1D" in the Northern Virginia region.

You can also provide an IPv6 CIDR block by entering two hexadecimal digits (for example, 00). After setting the values, click Create Subnet. The created subnet will appear in the "US East 1D" availability zone.

Step 3: Creating the Second Subnet

Repeat the process to create another subnet. Click on Create Subnet, select your VPC, and name this subnet "subnet 2". Choose a different availability zone, such as "US East 1A", and assign a CIDR block like 10.0.5.0/24.

After creating the second subnet, remove any filters to view all subnets within your VPC. This helps confirm that both "subnet one" and "subnet 2" are correctly associated with your VPC.

Step 4: Deploying an EC2 Instance into a Specific Subnet

To deploy a server into a specific availability zone, you must choose the relevant subnet during the EC2 instance launch. For instance, deploying an instance in "subnet one" will place it in "US East 1D" and assign an IP from the 10.0.1.0/24 range.

Launching Your Instance

1. Navigate to Instances in the AWS Management Console.
2. Click Launch Instance.
3. Name the instance (e.g., "instance one") and select your preferred image.
4. Choose a key pair if necessary.
5. Under the networking settings, select your previously created VPC. Both subnets will be visible; choose "subnet two" if you wish to deploy the instance in "US East 1A" with the CIDR block 10.0.5.0/24.
6. If the subnet is public, you may opt to assign a public IP automatically.
7. Use the default security group settings and complete the launch process.

After configuring the settings, review the instance details in the summary view:

When your instance is launched, navigate back to the Instances section. Even before the instance is fully booted, an IP address will be assigned. For example, deploying into "subnet two" might result in an IP like 10.0.5.113, taken from the available range.

Step 5: Cleaning Up Resources

Once your demonstration is complete, it's important to clean up to avoid unnecessary resource usage. Follow these steps:

1. Delete the launched EC2 instance.
2. Navigate to your demo VPC, click on Actions, and select Delete VPC.

A confirmation dialog will appear, indicating that deleting the VPC will also delete its subnets (and any associated security groups). Type "delete" to confirm the removal.

Confirm the deletion, and your VPC along with all subnets will be removed from your account.

This concludes the subnet demonstration. Following these steps will help you effectively manage your network architecture within AWS.

Happy networking!