ajayumredkar78 / webservertfcode

Sure! Here's a simple explanation of what this Terraform code does:

1. Creating a Virtual Network (VPC):

   • A new virtual network called demo_vpc is created with a range of IP addresses from 10.0.0.0 to 10.0.255.255. This is like setting up a private, isolated section of a larger network where you can place your resources.

2. Setting Up an Internet Gateway:

   • An internet gateway called gw is created and attached to the demo_vpc. This gateway allows resources within the VPC to communicate with the internet.

3. Creating a Route Table:

   • A route table named route_table is created for the VPC. This route table has a rule that directs all outbound traffic (0.0.0.0/0 means "anywhere on the internet") to go through the internet gateway.

4. Creating a Subnet:

   • A subnet called my_subnet is created within the VPC. Think of a subnet as a smaller network within your larger virtual network. This subnet uses the IP range 10.0.1.0 to 10.0.1.255 and is located in the availability zone us-east-1a.

5. Associating the Subnet with the Route Table:

   • The subnet my_subnet is linked to the route table route_table, which ensures that resources in this subnet follow the routing rules defined in the route table.

6. Setting Up a Security Group:

   • A security group named instance_sg is created to control traffic to and from resources within the VPC. It allows:
     • Inbound SSH traffic (port 22) from anywhere.
     • Inbound HTTP traffic (port 80) from anywhere.
     • Inbound HTTPS traffic (port 443) from anywhere.
     • All outbound traffic (all ports) to go anywhere.

7. Launching a Web Server Instance:

   • An instance (virtual machine) named webserver is launched using an Amazon Machine Image (AMI) identified by ami-053b0d53c279acc90. This instance is a t2.micro type and uses an SSH key named terrakey.
   • This instance is located in the subnet my_subnet and the availability zone us-east-1a.
   • When the instance starts, a script runs to:
     • Update the system packages.
     • Install the Apache web server.
     • Start the Apache web server.
     • Create a simple web page with the message "Congratulations! on your first Webserver Installation."

8. Outputting the Public IP:

   • Finally, the code outputs the public IP address of the webserver instance, which you can use to access the web server from the internet.

In summary, this Terraform script sets up a basic infrastructure on AWS: a virtual network, an internet gateway, a subnet, security rules, and a virtual machine running a web server.