Running scalable httpd service on AWS

Prerequisites

1. An AWS Account

2. Basic knowledge regarding EFS, ASG, LaunchConfig, ALB, and EC2.

3. We’ll be using **t2.micro** instance type as it is under AWS Free Tier, but I will still use Spot Instance :D.

4. We’ll be deploying our instances in **Public Subnet**, using the default VPC inside of AWS that was created for you by default.

5. Basic VPC Knowledge; CIDR, Subnet, Route Tables, etc

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#1: Creating your custom EC2 Security Group

SG #1

Name: efs-sg-default
Description: Allows EFS Access
VPC: AWS Default VPC
Inbound rules
1. NFS -> 0.0.0.0/0
Tags
Name -> Allow EFS
Others
Set it as default

SG #2

Name: alb-sg
Description: Allows HTTP Access via ALB (Port 80)
VPC: AWS Default VPC
Inbound rules:
1. HTTP -> 0.0.0.0/0
Tags:
Name -> Allow HTTP for ALB
Others
Set it as default

SG #3

Name: ec2-sg
Description: SG for EC2
VPC: AWS Default VPC
Inbound rules
1. HTTP -> alb-sg (Select SG)
2. SSH -> 0.0.0.0/0
Tags
Name -> SG for EC2
Others
Set it as default

#2: Creating your EFS (Elastic File System)

Configurations:

Name: Website Data
Availability and durability: One Zone
AZ: ap-southeast-1
Automatic backups: Disabled
Lifecycle management: None
Performance mode: General Purpose
Throughput mode: Bursting
Encryption (Data at rest): Turned on
VPC: default
Subnet: Default Subnet (Depending on the AZ selected)
Security Group: Created from #1 (efs-sg-default)

* Leave everything else as default and create your EFS

#3: Creating Launch Template

Name: httpd-template
Auto Scaling guidance: Optional but I have turned it on
AMI: Amazon Linux 2
Instance type: t2.micro (Free tier eligible)
Key pair: Select any existing Key pair, or create a new one.
Security Group: Select “efs-sg-default” & “ec2-sg” SG created from #1
Storage: Default (8 GB)

Advanced Details
Request Spot Instances: Enabled
IAM instance profile: Select any IAM Role if you have

User Data Script:

#!/bin/bash
sudo yum update -y
sudo yum install httpd -y
sudo systemctl start httpd
sudo systemctl enable httpd
sudo mount -t nfs4 -o nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport “your_efs_ip”:/ /var/www/html

NOTE:
You may need to replace “your_efs_ip”** with the real ID of your EFS which you may find in the AWS Management Console.

#5: Creating Target Groups for ALB

Choose a target type: Instances
Target group name: httpd-tg
Protocol: HTTP -> Port 80
VPC: AWS Default VPC
Health check protocol: HTTP
Health check path: /

Click on “Next”

Register Instances: Do not select any instances

Finally, create the Target Group

#6: Create Application Load Balancer

Name: httpd-alb
Scheme: Internet-facing
IP address type: IPv4
VPC: AWS Default VPC
Subnet Mappings: Select all
Security Group: Created from #1 (allow-http-for-alb)
Target Group: Created from #5 (HTTP: 80 -> httpd-tg)

And create it!

#7: Create Auto Scaling Group

Auto Scaling group name: httpd-asg
Launch template: Created from #4) (httpd-template)
VPC: AWS Default VPC
AZ: Select all
Attach existing Load Balancer: Created from #6 (httpd-alb)
Desired capacity: 2
Minimum capacity: 1
Maximum capacity: 2
Scaling policies: None for now
Instance scale-in protection: Disabled
Tags:
1. Name -> “HTTPD Instance”

And create it!

Upon a success creation of resources in the steps above, you can now visit the URL of your ALB on the browser and enjoy it ! Your website files are now gathered in all the EC2 instances via EFS, and load balanced.

To add a new file, or change something — All you have is to SSH into one of the instances and change the files. It will be automatically reflected across all the other instances.