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 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.
We have an ELB which can scale up and down from 1 to 4 instances. When we deploy a new verison of the server it spins up a new instance.
Because we need 256 bit encryption on our HTTPS we've been forced to use the classic load balancer (the only one where we can force clients, in our case android and iphone apps). What we noticed is that the load balancer is strictly associated to a specific instance. So when the server is re-deployed then the load balancer stops working b/c the instance it was associated with does not exist anymore.
Is there any way to handle this? Or is there a way where we can use a application load balancer and still get 256 bit encryption?
You could use rolling updates with Elastic Beanstalk. During an update a new instance will be added first. The new instance should be associated with the Load Balancer. When the new instance is up and running, the old one is stopped and removed from the Load Balancer. New instances should be associated with the Load Balancer automatically. If this doesn't happen, there must be something happening with your Elastic Beanstalk Environment.
You can definitely use 256 encryption with a Network Load Balancer. You will have to terminate SSL at the EC2 instances.
I am trying to add a simple HTTP to HTTPS redirect using AWS Application Load Balancer but it seems that all tutorials are out to date:
https://aws.amazon.com/premiumsupport/knowledge-center/elb-redirect-http-to-https-using-alb/
https://docs.amazonaws.cn/en_us/elasticbeanstalk/latest/dg/configuring-https-elb.html
I didn't see any option to add Rules under the load balance console, I also checked for this option on AWS CDK and haven't find anything.
The Load Balancer was created by an Elastic Beanstalk app, so I assume that it's an Application Load Balance.
I've seen a lot of tutorials and remind myself of doing same thing last year but now I don't see any option to set rules/redirects using the new AWS Console.
Redirecting EC2 Elastic Load Balancer from HTTP to HTTPS
This is the only option I am seeing available at the console under listener sections:
The Load Balancer was created by an Elastic Beanstalk app, so I assume that it's an Application Load Balance
Actually, it's a Classic load balancer. You can tell because the listener config specifies the load balancer point and the instance port. For an Application load balancer, the instance configuration is part of the target group.
So, turns out that ELB allows setting Load balance type only at the creation time. In my case, I created my stack as a single instance and add a load balance latter, so AWS automatically sets the default load balancer as the CLASSIC one instead of the application load balance (where we can use targets, rules, etc).
So I had to recreate my environment setting the correct load balancer type.
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 working on AWS. I have a doubt regarding how many applications a load balancer can support.
Like if I have an application whose traffic is routed and managed by one load balancer, then can I use that LB for another application also???
Also if I can use that ELB for another applications also than how ELB will get to know that which traffic should be routed to Application A server and which to Application B server??
Thanks
I think you may be misunderstanding the role of the load balancer. The whole point of a load balancer is that any of the servers behind it can provide any of the services. By setting it up this way you ensure that the failure of any one server will not affect availability of the service.
You can load balance any TCP service such as HTTP just by adding it as a "listener" for the ELB. The ELB can therefore support as many applications as you want to forward to the servers behind it.
If you set up an image of a server that provides all the services you need, you can even have the ELB auto scale the number of servers up and down by launching or terminating instances from that image as the load varies.