“Internet Gateway” project on AWS that demonstrates how to set up a VPC and allow EC2 instances to access the internet. This is useful for understanding VPC networking basics like subnets, route tables, and gateways.

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🔧 Project Title: Setting Up an Internet Gateway in AWS

✅ Objective:

To create a custom VPC with an Internet Gateway and launch an EC2 instance that can access the internet.

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🛠️ Components Used:

• Amazon VPC
• Subnet
• Internet Gateway
• Route Table
• EC2 Instance
• Security Group

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📝 Steps:

1️⃣ Create a VPC

aws ec2 create-default-vpc
aws ec2 create-vpc --cidr-block 10.0.0.0/16
aws ec2 create-vpc \
  --cidr-block 10.0.0.0/16 \
  --tag-specifications 'ResourceType=vpc,Tags=[{Key=Name,Value=myvpc}]'
aws ec2 delete-vpc --vpc-id vpc-0b39f70cdf4afc638

2️⃣ Create a Public Subnet

aws ec2 create-subnet --vpc-id vpc-0170bc4d060213ea2 --cidr-block 10.0.1.0/24

3️⃣ Create an Internet Gateway

aws ec2 create-internet-gateway

4️⃣ Attach the Internet Gateway to the VPC

aws ec2 attach-internet-gateway --internet-gateway-id igw-03eaa26f4fe5bdb45 --vpc-id vpc-0170bc4d060213ea2

5️⃣ Create a Route Table

aws ec2 create-route-table --vpc-id vpc-0170bc4d060213ea2

6️⃣ Create a Route to the Internet

aws ec2 create-route --route-table-id rtb-0afda24b8d3dd7e36 --destination-cidr-block 0.0.0.0/0 --gateway-id igw-03eaa26f4fe5bdb45

7️⃣ Associate Route Table with Subnet

aws ec2 associate-route-table --subnet-id subnet-0e677c82616ee740e --route-table-id rtb-0afda24b8d3dd7e36

8️⃣ Modify Subnet to Enable Auto-assign Public IP

aws ec2 modify-subnet-attribute --subnet-id subnet-0e677c82616ee740e --map-public-ip-on-launch

Create mykey.pem

aws ec2 create-key-pair \
  --key-name mykey \
  --query 'KeyMaterial' \
  --output text > mykey.pem

9️⃣ Launch EC2 Instance in the Subnet

aws ec2 run-instances \
  --image-id ami-0953476d60561c955 \
  --count 1 \
  --instance-type t3.micro \
  --key-name mykey \
  --security-group-ids sg-0d91531613c3e6618 \
  --subnet-id subnet-0e677c82616ee740e \
  --associate-public-ip-address \
  --tag-specifications 'ResourceType=instance,Tags=[{Key=Name,Value=MyEC2Instance}]'

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Note Down Security Group then run following script 🔐 Security Group Setup:

git clone https://github.com/atulkamble/AWS-Internet-Gateway-Project.git
cd AWS-Internet-Gateway-Project
chmod +x add-sg-rules.sh
sudo sh add-sg-rules.sh
OR
./add-sg-rules.sh

Ensure your security group allows inbound traffic:

• SSH (port 22) from your IP
• HTTP (port 80) from anywhere if you're testing with a web server

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🧪 Test:

• SSH into the instance.
• curl google.com to verify internet access.

Delete

delete ec2 instance 
detach internet gateway | delete internet gateway 
delete vpc (automatically deleted subnet, route table)

AWS Cloudformation Template

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🚀 How to Deploy

aws cloudformation create-stack \
  --stack-name InternetGatewayProject \
  --template-body file://internet-gateway-setup.yaml \
  --parameters ParameterKey=KeyName,ParameterValue=mykey \
  --capabilities CAPABILITY_NAMED_IAM

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