Added subnet and other networking stuff to ec2 instance creation. Also created a firewall rule to allow incoming SSH connection and all outgoing connections.

Terraform/main.tf

@@ -2,8 +2,34 @@ provider "aws" {
   region = "ap-south-1"
 }
 
-resource "aws_instance" "example" {
-  ami           = "ami-0861f4e788f5069dd"
+# EC2 instance
+resource "aws_instance" "ec2_t2-micro" {
+  ami                         = "ami-0861f4e788f5069dd" # Amazon Linux
   instance_type               = "t2.micro"
   key_name                    = "kshitij-personal-ed25519"
+  subnet_id                   = "subnet-0f2515644bbe8e603"
+  associate_public_ip_address = true
+  vpc_security_group_ids      = [aws_security_group.ec2_ssh_security.id]
+
+  tags = {
+    Name = "Test-EC2"
+  }
+}
+
+# Security group (firewall) for allowing incoming SSH connections
+resource "aws_security_group" "ec2_ssh_security" {
+  name = "allow_ssh"
+
+  ingress {
+    from_port   = 22
+    to_port     = 22
+    protocol    = "tcp"
+    cidr_blocks = ["${var.ssh_ingress}"]
+  }
+  egress {
+    from_port   = 0
+    to_port     = 0
+    protocol    = -1
+    cidr_blocks = ["0.0.0.0/0"]
+  }
 }