Subnets Demo

In this lesson, you will learn how to create subnets within a Virtual Private Cloud (VPC) and deploy an EC2 instance into a specific subnet. We'll start by creating a VPC and then proceed to set up two subnets within it.

Step 1: Create a VPC

Begin by navigating to the VPC section in the AWS Management Console. Select the "VPC only" option and configure your VPC with the following details:

• Name: demo VPC
• CIDR block: 10.0.0.0/16
• (Optional) Enable the Amazon provided IPv6 CIDR block.

This configuration is all you need to create your VPC.

Once the VPC is created, you will be taken to the VPC creation interface.

Step 2: Create Subnets in the VPC

Create the First Subnet

1. Navigate to the subnets section and click on Create Subnet.
2. Select the custom VPC you just created.
3. Name: subnet one
4. Availability Zone: Choose one among the available zones from the Northern Virginia (US East) region. For this example, select US East 1D.
5. CIDR Block: It is crucial that the subnet's CIDR block falls within the VPC's CIDR block. Therefore, set the CIDR block for "subnet one" to 10.0.1.0/24.

   Warning

   Using a CIDR block outside of the range 10.0.0.0/16 (like 192.168.1.0/24) will result in an error.

After configuring the details, click Create Subnet.

Create the Second Subnet

To create another subnet within the same VPC:

1. Click Create Subnet again.
2. Select the custom VPC.
3. Name: subnet two
4. Availability Zone: Choose a different zone; for example, select US East 1A.
5. CIDR Block: Set the CIDR block to a range within 10.0.0.0/16, such as 10.0.5.0/24.

Once you have configured "subnet two," click Create Subnet.

After creating both subnets, clear any applied filters on your VPC dashboard. You can also filter by your specific VPC to display only the subnets you created.

Step 3: Deploy an EC2 Instance in a Specific Subnet

To demonstrate subnet usage, you can launch an EC2 instance in one of your subnets:

1. Go to the EC2 launch interface and select the VPC you created.
2. Under the networking section, you will see both subnets available. For this example, choose subnet two (US East 1A) so that the instance will be deployed with an IP address within the 10.0.5.0/24 range.
3. Select your desired Amazon Machine Image (AMI), choose an existing key pair, and keep the default security group settings.
4. Launch the instance. AWS will automatically assign a private IP address from subnet two.

After launching the instance, navigate to the Instances section in the console to verify the deployment. Even if the instance is still booting, you should see it has been assigned a private IP address (e.g., 10.0.5.113), confirming its placement in subnet two.

Step 4: Clean Up Resources

When you no longer need the instance or the VPC, it is important to terminate and delete them properly:

1. Delete the EC2 instance from the Instances section. Confirm that it has been terminated.
2. Return to your demo VPC and delete it. Note that deleting the VPC will also remove all associated subnets.

Summary of Steps

This lesson provided a step-by-step guide to setting up a VPC, configuring subnets, launching an EC2 instance in a specific subnet, and finally cleaning up the resources. For additional guidance and resources on AWS networking, consider exploring the AWS Documentation and AWS VPC User Guide.