unable to access EC2 instance created using terraform - amazon-web-services

Question

I have been following youtube guide to learn terraform and have followed each steps.
After running terraform apply it was able to setup everything as expected. I have verified this on aws console. But while trying to access the public ip it is saying connection refused.
Below is the content of my main.tf file.
provider "aws" {
region = "us-east-1"
access_key = "ACCESS-KEY"
secret_key = "SECERT-KEY"
}
# VPC
resource "aws_vpc" "prod-vpc" {
cidr_block = "10.0.0.0/16"
tags = {
Name = "production"
}
}
# create internet gateway
resource "aws_internet_gateway" "gw" {
vpc_id = aws_vpc.prod-vpc.id
tags = {
Name : "Prod gateway"
}
}
# create custom route table
resource "aws_route_table" "prod-route-table" {
vpc_id = aws_vpc.prod-vpc.id
route {
cidr_block = "0.0.0.0/0"
gateway_id = aws_internet_gateway.gw.id
}
route {
ipv6_cidr_block = "::/0"
gateway_id = aws_internet_gateway.gw.id
}
tags = {
Name = "Prod"
}
}
# Create a subnet
resource "aws_subnet" "subnet-1" {
vpc_id = aws_vpc.prod-vpc.id
cidr_block = "10.0.1.0/24"
availability_zone = "us-east-1a"
map_public_ip_on_launch = true
tags = {
Name = "prod-subnet"
}
}
# Associate subnet with Route Table
resource "aws_route_table_association" "a" {
subnet_id = aws_subnet.subnet-1.id
route_table_id = aws_route_table.prod-route-table.id
}
# Create Security Group to allow port 22, 80, 443
resource "aws_security_group" "allow_web" {
name = "allow_web_traffic"
description = "Allow Web traffic"
vpc_id = aws_vpc.prod-vpc.id
ingress {
description = "HTTPS"
from_port = 443
to_port = 443
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
ingress {
description = "HTTP"
from_port = 80
to_port = 80
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
ingress {
description = "SSH"
from_port = 2
to_port = 2
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
ipv6_cidr_blocks = ["::/0"]
}
tags = {
Name = "allow_web"
}
}
# Create a network interface with an ip in the subnet that was created earlier
resource "aws_network_interface" "web-server-nic" {
subnet_id = aws_subnet.subnet-1.id
private_ips = ["10.0.1.50"]
security_groups = [aws_security_group.allow_web.id]
tags = {
Name : "prod-network-interface"
}
}
# Assign an elastic ip to the network interface created in previous step
resource "aws_eip" "one" {
vpc = true
network_interface = aws_network_interface.web-server-nic.id
associate_with_private_ip = "10.0.1.50"
depends_on = [aws_internet_gateway.gw, aws_instance.web-server-instance]
tags = {
Name : "Prod-Elastic-ip"
}
}
# Create Ubuntu server and install/enable apache2
resource "aws_instance" "web-server-instance" {
ami = "ami-0747bdcabd34c712a"
instance_type = "t2.micro"
availability_zone = "us-east-1a"
key_name = "main-key"
network_interface {
device_index = 0
network_interface_id = aws_network_interface.web-server-nic.id
}
user_data = <<-EOF
#! /bin/bash
sudo apt update -y
sudo apt install apache2
sudo bash -c 'echo your very first web server > /var/www/html/index.html'
EOF
tags = {
Name : "Web-Server"
}
}

Answer 1

You are missing -y in your user data, so your user-data will just hang for confirmation. It should be:
sudo apt install -y apache2

Answer 2

You missed that another command need to start this apache2 after installed it
sudo systemctl start apache2

Answer 3

It also seems that the SSH port on the security group is not configured correctly. It should probably read 22 instead of 2 for both from_port and to_port.

Answer 4

The major problem here is at security group. For SSH configuration you should open port 22, the default SSH port.
ingress {
description = "SSH"
from_port = 22
to_port = 22
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
Besides that, you should fix your userdata with:
#! /bin/bash
sudo apt update -y
sudo apt install apache2 -y
sudo systemctl start apache2
sudo bash -c 'echo your very first web server > /var/www/html/index.html'
I hope this can help you and other people with the same or similar issue.