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multi_az_autoscalling_deployment.md

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Multi AZ Deployment, AutoScalling Groups.

1. Create Key Pair to access Linux EC2 Instance

2. Create Three Security Groups

a. Create Load Balancer Security Groups (LBSG) Attach to Load Balancer
	a1. Allow Port 80
b. Create Web Server Security Group (WEBSG) attach to EC2 instances
	b1. Allow Port 80 - http portocol access Custom Allow LBSG 
	b2. Allow Port 22 - SSH to access EC2 instances Allow Any-Where-IPv4
c. Create EFS Security Group (EFSSG) to allow 2049(NFS) protocol
	c1. Allow 2049 Port and allow WEBSG group as custom to accessed by EC2 instances

3. Create EFS Share and copy the attach command

- Specify the EFS Name
- Select Security Group (EFSSG)

4. Create a Target Group

- Target type - Instances
- Target Group Name - Ex: app1
- Protocol HTTP = 80
- Health Checks 
	- HTTP
	- Health check path
	- /checkstatus.html (This page should be available in EC2 instance otherwise health check will fail)
- Additional health check settings
- healthy threshold to 3
- unhealthy threshold to 2
- Internal is 10 Seconds

5. Create Application Load Balancer

- Provide Load Balancer Name (MyALBWebServer)
- Scheme (Internet-facing)
- IPv4 Address type
- Default VPC and Select all the AZ's
- Security Group is LBSG
- Select the Target group (Created on step 4)
- (Create Load Balancer)

6. Create AutoScalling Groups

- Group Name
- Define Launch Template
	- Template Name
	- Description
	- Select OS (Amazon Linux 2023)
	- Select Instance type (t2.micro)
	- Select KeyPair (you create at the first step)
	- Select the Security Group as (WEBSG)
	- Advanced usage define the shell script to install and start httpd and mount EFS.

```
   #!/bin/bash
		yum update -y
		yum install httpd -y
		systemctl start httpd
		systemctl enable httpd
		sudo mount -t nfs4 -o nfsver=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport <fs.nfs.efs.us.east-1.amazon.com>:/ /var/www/html/
		echo "<h1>Web Server is working fine!</h1>" > /var/www/html/index.html
		echo "<h1> Its Healthy </h1>" > /var/www/html/checkstatus.html


Note: Here replace <fs.nfs.efs.us.east-1.amazon.com> with your EFS path