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I have application deployed on tomcat server on machine A,B,C,D
I want to load balance using the Nginx using two load balancer nodes LB1 & LB2.
All configuration I got is using only one node as load balancer.
is it possible using Nginx.
If we have a critical application running on server require the zero down time. If we go with one LB and for some reason LB itself fails,then there will be an issue.
We have this set up initially using AWS Load balancer, but recently we start using the websockets. The web sockets are not working correctly on EC2 load balancer.
if some one has better option please suggest.
Use Amazon ELB and forward TCP:80/443 instead of HTTP:80/443
The only downside of balancing TCP is that your appservers have to deliver SSL certificates themselves if you use HTTPS.
If you want to run the loadbalancer yourself without having a single point of failure you can use haproxy to fall back to a standby machine when the primary balancer fails.
http://www.loadbalancer.org/blog/transparent-load-balancing-with-haproxy-on-amazon-ec2
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Frontend and backend service seem to be working fine separately on its own, but when I try to communicate between frontend and backend I keep getting ERR_NAME_NOT_RESOLVED error.
Service discovery are all connected
All security groups are open
I think our architecture is very similar to this if that helps.
(https://mohamedwaelbenismail.medium.com/microservices-architecture-deployed-on-ecs-fargate-based-cluster-using-cloudformation-878cb6f90571)
It only works if we change the internal load balancer to public load balancer allow internet traffic and allow 0.0.0.0/0.
Status of health check are all 'healthy'
Based on your schematic illustration, your React web application front end will never be able to reach your backend. Your front end executes on a client side in their browsers/mobiles. This means that the only way to reach backend is through internet. So your backend can't be in a private subnet behind an internal load balancer.
You have to re-architect your application. Both frontend and backund must be accessible from the internet, for your front end to be able to query the backend.
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I have an nginx that is configured for SSL Termination and work as expected for my application.
For Disaster Recovery purposes I want to set up an AWS Application Load Balancer in fron of my HTTPS NGINX. The ALB will be exposed with a Network LoadBalancer that will do the region switch.
The issue is that if I call my application, the AWS Application Load Balancer it's doing the SSL Termination and the certificates are not reaching NGINX:
400 No required SSL certificate was sent
400 Bad request
Since I would like to keep my SSL termination at the NGINX level, can I configure the AWS Application LoadBalancer Listener to forward the certificates for the nginx aslo?
ALBs are layer 7 load balancers that only support HTTP/HTTPS listeners. SSL passthrough has to happen before layer 7 actions so it's not possible to configure ALBs for SSL passthrough. However you should be able to do this with a network load balancer, using TCP listeners.
This AWS blog outlines a similar setup, but for ECS - https://aws.amazon.com/blogs/compute/maintaining-transport-layer-security-all-the-way-to-your-container-using-the-network-load-balancer-with-amazon-ecs/
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I am trying to deploy a Kafka cluster on AWS (using CloudFormation). My advertised listeners are (using a private DNS namespace to resolve the internal IP):
INTERNAL://kafka-${id}.local:9092
EXTERNAL://<public-ip>:9092
However, Kafka complains that two listeners cannot share the same port. The problem is I'm using a load balancer for external traffic, and I'm not sure if there's a way to redirect that traffic to a different port.
My desired configuration would be:
INTERNAL://kafka-${id}:9092
EXTERNAL://<public-ip>:19092
But the load balancer takes the incoming request and passes it to the internal IP at the same port. Ultimately I'd like to have the load balancer take connections on port 19092 and pass them to 9092, but I don't see any way to configure that.
If there are any recommendations on alternative ways to do this, I'm happy to hear them. Currently, I need services that are on other VPCs to be able to communicate with these brokers, and I'd prefer to use a load balancer to handle these requests.
Based on the comments.
The NLB does not support redirection rules in its listeners. It only has forwarding rules. But a listener can use different port that its targets defined by a target group. So a possible setup could be:
Client ---> Listener on port 19092 ---> NLB ---> Target group with port 9092
#Marcin answered this for me. See comments for details.
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On my backend instance a service is running which has to accept multiple connection in a second but TCP LB is not allowing multiple connection at a time.
Please help me to increase LB connection to max.
Where did you get the information it only allow one connection at time?
The Network Load Balancer (Also known as TCP load balancer) allows you to balance load of your systems based on incoming IP protocol data, such as address, port, and protocol type. As long as your instance services has resources to handle the request, the load balancer will redirect the traffic.
You can read more about it in this oficial document form Google.
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I have some EC2 instances running an express application listening on port 3000. I then have an elastic load balancer forwarding request from it's port 80 to these EC2 instances. Every time I bring down one of the express servers running on an EC2 instance and try to bring it back up I get the address in use error for port 3000. I can not find any actual process using this port (lsof, netstat, etc) is ELB still connected on port 3000 ? If so what is the workflow to restart applications behind ELB ?
Take a look at "Connection Draining" and either disable it or reduce the time.
It sounds like the process isn't exiting until all connections have closed.