Skip to main content

AWS : Elastic Load Balancer Exam Tips and Preparation Key Points



Start with what is Elastic Load Balancing?

Elastic Load Balancing automatically distribute incoming application traffic to multiple destinations, such as Amazon EC2 instances, containers, IP address, and lambda functions. It can handle a variety of application traffic load in a single Availability Zone or multiple Availability Zones.

Key points:

The following two types of load balancer:

1. Internet Facing: has public IP

2. Internal Load Balancer: routes traffic within a VPC

There are three categories of Load Balancer:

1. Application Load Balancer
2. Network Load Balancer
3. Classic Load Balance

First Application Load Balancer

Operates at Layer 7.
Supports WebSockets and Secure WebSockets.
Supports SNI.
Supports IPv6.

Second Network Load Balancer ( The NLB is the recommended Load Balancer to be used at Layer 4)

Operates at Layer 4.
Preserves the source IP.
Provides reduced latency compared to other Load Balancers.
Handles millions of requests per seconds.

Third Classic Load Balancer
Operates at Layer 4.
Features Cross Zone Load Balancing.

Idle Connection Timeout: 
Is the period of inactivity between the client and the EC2 instance in which the Load Balancer terminates the connection. By default, it is 60 seconds.

Enable Cross Zone Load Balancing, to distribute traffic evenly across the pool of registered AWS instances.

Connection Draining stops the load balancer sending traffic to faulty instances.

Proxy Protocol: To receive the clients IP and User Agent, it needs to be enabled. (only on Network Load Balancer and Classic Load Balancer)

Sticky Sessions: Ensures that the load balancer sends future user request to the EC2 instance that received the initial request.

Auto Scaling Group: Lets you increase or decrease the number of EC2 instances based upon CPU, RAM, Scheduled Scaling (usually used when you predict that there will be an increase in load in X time ex: Marketing Campaign)

Thanks for being here
Labels:

Comments

Post a Comment

Popular posts from this blog

Apt-fast for Increasing Download Speed while Installing and Updating Packages Ubuntu/Debian [Beginners Guide]

Have you ever experienced slow download speed when downloading or updating packages in Ubuntu even when your network connection is running fine? You encounter this issue especially when updating and installing packages for the first time after installing a new Ubuntu/Debian OS. However, there is a way to get around this by speeding up the download speed using apt-fast command in Linux. Apt-fast is a shell script wrapper for “apt-get” and “aptitude” that uses the power of either  axel  or  aria 2  download managers to accelerate the download process. It improves download performance by downloading packages simultaneously in parallel with multiple packages per connection. In this article, we will walk through some steps to install apt-fast in order to accelerate the update and downloading process in Ubuntu. We will use Ubuntu 18.04 LTS for describing the procedure mentioned in this article.   Step 1: Installing prerequisites We need to install...
Post a Comment
Read more

What is a CDN ? How Does a content delivery network Work?

I ntroduction. Latest Web sites and applications often need to provide   amount of static content to end users. This content includes images, style sheets, JavaScript, and video. The increase in the number of static assets and the increase grows the bandwidth usage increases page load time decreased, depending on the size of the user's search experience, and reduce the usable capacity of the server. Dramatically improving performance, reducing the page load time   reduce the bandwidth and infrastructure costs, you can implement a content delivery network,  And  CDN cache these assets at a set of servers that are geographically distributed. What is a CDN? Content delivery network is a group of servers distributed geographically optimized to provide static content to end users. While this static content can be almost any type of data, CDNs are most commonly used to deliver web pages and related files, streaming video and audio, and large softwar...
Post a Comment
Read more

Why AWS (amazon cloud) is better for Cloud Servers?

The Amazon Web Services provides remote computing services. Most important and well-known service is the Amazon S3 and Amazon EC2. I have compiled some of the reasons for the AWS choice as Cloud Server, for big and small users.   Pricing Model : Pay-As-You-Go. I am only pay for that what I use. Let’s take an example to understand this: In AWS infrastructure I am using 13GB, now usually what happens with other cloud service I estimate my usage say 40GB, reserve it, and pay for that 40GB monthly. And with AWS, I am not using the whole 40GB. I just have 13GB of data, so I just pay for that 13GB, and I can always store more as your requirements grow, there is no restriction!     Security. Cloud security at AWS is the highest priority Amazon cloud is a secure, durable technology platform with industry-recognized certifications and audits: PCI DSS Level 1, ISO 27001, FISMA Moderate, FedRAMP, HIPAA, and SOC 1 (formerly referred to as SAS 7...
Post a Comment
Read more