I am pretty new to AWS deployment (please send any helpful guides). And I read that it comes with an elastic load balancer but I've also heard that a lot of people put NGINX on an EC2 to use as a load balancer.
Do people commonly use either or? Having two seems redundant.
Nginx on an EC2 instance for load balancing would be a single point of failure, if the EC2 instance went down your app would be down. An AWS Load Balancer is actually multiple load balancer nodes distributed across multiple AWS availability zones to provide high availability. The EC2 instance would also be something for you to have to manage, where an AWS Load Balancer is managed for you by Amazon.
You mention Elastic Beanstalk in your question title. Elastic Beanstalk will use both. It uses a Load Balancer for distributing traffic across multiple instances, and it uses Nginx on each instance as a reverse proxy to your application.
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I've created a web application using Beanstalk. I want to install a program on the load balancer. It's Zerotier (a program that enable you to create a local network over the internet). However, I'm not able to find a way to login to the load balancer server to do that. I know that I can install the program directly in the EC2 instance but the problem here is that the program will stop working when auto scaled.
install and add the program by making a deployment or service, not in the load balancer but in the cluster, your load balancer will help you to divide the work equally. on AWS its automatically provide you with the Load Balancer.
A load balancer serves as the single point of contact for clients. The load balancer distributes incoming application traffic across multiple targets, such as EC2 instances, in multiple Availability Zones. This increases the availability of your application. You add one or more listeners to your load balancer.
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I have two VM's (in AWS cloud) connected to single DB. Each VM is having same application running. I want to load balance those two VM's and route based on the traffic. (Like if traffic is more on one VM instance then it should switch to another VM).
Currently I am accessing 2 different instances with 2 different IP addresses with HTTP. Now I want to access those 2 VM's with HTTPS and route the instances with same DNS like (https://dns name/service1/),
(https://dns name/service2/)
How can I do load balancing using nginx ingress.
I am new to AWS cloud. Can someone help me or guide me or suggest me some appropriate related references in getting the solution to it.
AWS offers an Elastic Load Balancing service.
From What is Elastic Load Balancing? - Elastic Load Balancing:
Elastic Load Balancing automatically distributes your incoming traffic across multiple targets, such as EC2 instances, containers, and IP addresses, in one or more Availability Zones. It monitors the health of its registered targets, and routes traffic only to the healthy targets. Elastic Load Balancing scales your load balancer as your incoming traffic changes over time. It can automatically scale to the vast majority of workloads.
You can use this ELB service instead of running another Amazon EC2 instance with nginx. (Charges apply.)
Alternatively, you could configure your domain name on Amazon Route 53 to use Weighted routing:
Weighted routing lets you associate multiple resources with a single domain name (example.com) or subdomain name (acme.example.com) and choose how much traffic is routed to each resource. This can be useful for a variety of purposes, including load balancing and testing new versions of software.
This would distribute the traffic when resolving the DNS Name rather than using a Load Balancer. It's not quite the same because DNS information is cached, so the same client would continue to be redirected to the same server until the cache is cleared. However, it is practically free to use.
I am new to aws. I hosted my .net website on aws last month via Elastic Beanstalk. Its a simple 5 page .net core website and do not have any database. The users are also too few.
Now the problem is I got the bill of the month where elastic load balancing charge is very high(almost 95%). My question is:
Do I need elastic load balancing service to run my website? Can't it be done without it.
If I will delete the elastic load balancing than what happen? Is there a way to disable it for a while and check?
If elastic load balancing is necessary than how can I control its use to minimum level or optimize it for low cost?
Ok, now the below answers partially resolved my problem. Now when I am changing my instance to single instance I am getting the below error:
Do I need elastic load balancing service to run my website? Can't it be done without it.
Yes, you can change your EB environment from load-balanced, to single-instance type. The single-instance does not use load balancer. It is only a single instance with elastic IP.
If I will delete the elastic load balancing than what happen? Is there a way to disable it for a while and check?
Thinks will break if you delete it manually. The correct way is to use EB configuration options to change from load-balanced to single-instance. What happens then, it depends on what you use the load balancer for? For example, if you use it for SSL certificates, you will loose HTTPs, and will have to set it up differently.
If elastic load balancing is necessary than how can I control its use to minimum level or optimize it for low cost?
Its not necessary. That's why single-instance EB environment exists.
Do I need elastic load balancing service to run my website? Can't it be done without it.
Ofcourse your website can run without a load balancer, load balancer is used when you have too many traffic on your website and you don't want to overload your single instance. In such a case load balancer evenly balances the load across different instance.
it provides a single dns name for your website through which all traffic enters ( another reason why people use load balancer)
If I will delete the elastic load balancing than what happen? Is there a way to disable it for a while and check?
if you a provision load balancer through beanstalk then deleting it manually will definitely break things, instead change your environment configuration to single instance, and as #marcin pointed out other things will also be taken like https,load balancer health of ec2 instances,stickiness with cookies.
https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features-managing-env-types.html
If elastic load balancing is necessary than how can I control its use to minimum level or optimize it for low cost?
Totally depends on the traffic on your website and the capacity of your instance. if your instance is big enough in terms of computing, memory no need of load balancer.( if its big ,naturally your instance will be free to cater all the request).
I am a little confused on how to prepare an elastic load balancer. Suppose I have a web application written in node.js and a frontend written in react.js Would I have the node.js/react.js code duplicated on multiple EC2 instances? Then hook those instances up to the load balancer so it can be distributed? In that case, if a change were to be made, it would have to be updated on each of the servers, correct?
Would I have the node.js/react.js code duplicated on multiple EC2
instances? Then hook those instances up to the load balancer so it can be distributed?
Yes, that's how load balancing works. It balances the load across multiple servers.
In that case, if a change were to be made, it would have to be updated
on each of the servers, correct?
Correct
I suggest you look into using Elastic Beanstalk, which will handle most of this for you. You would push a change to Elastic Beanstalk and it will handle deploying that change to each of the load balanced servers.
Elastic Beanstalk would be a perfect choice for your scenario where it handles the deployment of the code to the multiple numbers of EC2 instances.
Another workaround is to use an Autoscaling group, which will sit behind a load balancer.
I am new to AWS. I would like to activate load balancing. I need to know that should I create multipl ec2 instance with the same files? Or only one instance is enough?. What will happen while heavy traffic?
AWS Elastic Load balancer (ELB) is for distributing traffic across multiple EC2 instances. You will be registering the instances with the ELB. Even when instances fail and new instances are added to ELB, the traffic is evenly distributed among the remaining active registered instances. Please see the documentation: AWS Elastic Load Balancing
If you have only one instance, ELB will send traffic only to that. But, what is the use of ELB then? It serves no purpose to have only 1.
If you need to scale out as the traffic increases, you need to use AWS Auto Scaling : AWS Auto Scaling