Load Balancer:

• Health Check of LoadBalancer Setup in AWS EC2 Machine. Load balancing refers to efficiently distributing incoming network traffic across a group of backend servers, also known as a server farm or server pool.
• In this manner, a load balancer performs the following functions: Distributes client requests or network load efficiently across multiple servers.
• Enable the Load Balancer Based on Health Check

Types of Load Balancer:

• Application Load Balancers.
• Network Load Balancers.
•  Classic Load Balancers.
• Amazon ECS services can use either type of load balancer.
• Application Load Balancers are used to route HTTP/HTTPS

What is health check?

• Load Balancer periodically sends a request to its registered instance to test their status these tests are called health check.
• The Load Balancer routes request only to the healthy instance.
• When the load balancer determines that an instance is unhealthy, it stops routing requests to that instance.

How to create Load Balancer?

• Login to AWS Root user.
• In the AWS management console go to “services”.
• Go to “EC2”.
• In the EC2 dashboard go to “Load Balancer”.

• Click on “Create Load Balancer”.

• As we learn before we have three types of load balancer, Application Load Balancer, Network Load Balancer, Classic Load Balancer.
•  Application Load Balancer, Network Load Balancer these balancers need to pay for use.
• But for your learning porpoise, we go with “Classic Load Balancer”.
• In Classic Load Balancer click on “Create”.

• Give the load balancer name.
• Create LB Instance leave it as default.
• VPC configuration, Internal LB lives it unchosen because they will charge.
• Load Balancer Protocol gives as HTTP.
• Click on “Next”.

• Assign Security Group to load balancer.
• If you want to create a new security group can select create a group.
• If you want to select from the existing group you can select.
• Click on “Next”.

Health Check Setup

• Health check which your load balancer will automatically perform health checks on your EC2 instances and only route traffic to instances that pass the health check.
• If an instance fails the health check, it is automatically removed from the load balancer. Customize the health check to meet your specific needs.
• The Ping protocol as “HTTP”.
• Ping port “80”.
• Ping path “/healthy.html”.
• In Advanced Details give “Response Timeout”, which is used to set time to the website response.
• Add “Interval time”, which is used to set time to the website to reload.
• Give “Unhealthy threshold”, which checks the instance 2 times and the instance is not responding it is not healthy.
• Give “Healthy threshold”, which checks the instance 3 times by refreshing it if it gives an instance response it is healthy.
• Click on “Next”.

• Select EC2 instance if you have or otherwise we can add it later.
• Click on “Next”.

• Give the tag to the LB.
• Click on “Review and Create”.

• Review the details which you have given.
• Click on “Create”.

• The status bar shows 0 of 2 which means there is no instance is running.
• If it shows 2 of 2 it means the instance is in service.
• Let’s check whether the DNS name is working or not.
• Copy it and open in new tab.

• When you reload the page, it will send load to another EC2 instance, it will balance each time when you reload the page.
• So this is how Health Check of LoadBalancer Setup in AWS EC2 Machine