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Step_4-Custom_VPC_Setup.md

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Creating a Custom VPC with Subnets, Internet Gateway, and Route Tables

Step 1: Create a New VPC

  1. Log in to the AWS Management Console as the Admin user.
  2. Search for VPC in the Services bar and open the VPC console.
  3. In the navigation pane, under Virtual private cloud, select Your VPCs.
  4. Click Create VPC.
  5. Configure the following:
    • Name tag: app-vpc
    • IPv4 CIDR block: 10.1.0.0/16
  6. Click Create VPC.

Step 2: Create an Internet Gateway and Attach It

  1. Navigate to Internet gateways.
  2. Click Create internet gateway.
  3. Set the Name tag to app-igw, then click Create internet gateway.
  4. After creation, choose Actions > Attach to VPC.
  5. Select app-vpc and click Attach internet gateway.

Step 3: Create Subnets

Create four subnets — two public and two private:

  1. Go to Subnets and click Create subnet.
  2. Choose app-vpc as the VPC ID.

Public Subnet 1

  • Name: Public Subnet 1
  • AZ: us-west-2a (example)
  • CIDR: 10.1.1.0/24

Public Subnet 2

  • Name: Public Subnet 2
  • AZ: us-west-2b
  • CIDR: 10.1.2.0/24

Private Subnet 1

  • Name: Private Subnet 1
  • AZ: us-west-2a
  • CIDR: 10.1.3.0/24

Private Subnet 2

  • Name: Private Subnet 2
  • AZ: us-west-2b
  • CIDR: 10.1.4.0/24
  1. Click Create subnet once all four are added.

Step 4: Enable Auto-Assign Public IP for Public Subnets

For Public Subnet 1

  1. Select Public Subnet 1.
  2. Go to Actions > Edit subnet settings.
  3. Enable Auto-assign public IPv4 address.
  4. Click Save.

For Public Subnet 2

  1. Repeat the same steps for Public Subnet 2.

Step 5: Create Route Tables

Public Route Table

  1. Navigate to Route tables > Create route table.
  2. Set:
    • Name: app-routetable-public
    • VPC: app-vpc
  3. Click Create route table.

Add Internet Gateway Route

  1. Select app-routetable-public.
  2. Under the Routes tab, click Edit routes > Add route.
    • Destination: 0.0.0.0/0
    • Target: Internet Gateway → app-igw
  3. Click Save changes.

Associate Public Subnets

  1. Go to the Subnet associations tab.
  2. Click Edit subnet associations.
  3. Select:
    • Public Subnet 1
    • Public Subnet 2
  4. Click Save associations.

Private Route Table

  1. Go back to Route tables and click Create route table.
  2. Set:
    • Name: app-routetable-private
    • VPC: app-vpc
  3. Click Create route table.

Associate Private Subnets

  1. Select app-routetable-private.
  2. Go to Subnet associations > Edit subnet associations.
  3. Select:
    • Private Subnet 1
    • Private Subnet 2
  4. Click Save associations.

VPC Configuration Complete

You have successfully:

  • Created a custom VPC: app-vpc
  • Added and attached an Internet Gateway: app-igw
  • Created:
    • 2 Public Subnets
    • 2 Private Subnets
  • Enabled auto-assign public IP for public subnets
  • Created and associated:
    • Public Route Table with Internet Access
    • Private Route Table with no external route (yet)