Just getting an Elastic Load Balancer up for my application servers, and I'm having trouble connecting.
I placed 2 EC2 instances behind the load balancer, and both of them are successfully connected and InService, but putting the URL of the load balancer into Chrome never receives a response - it just hangs forever.
The ELB is placed under the security group where all incoming/outgoing is allowed.
Amazon's documentation assumes that something is wrong with your application servers, but they both work great, and the health checks are passing.
Help?
EDIT: Not using CNAME, guys. This is for a backend service, so I'm using the bare public DNS provided by AWS automatically. It's like:
http://api-load-balancer-XXXXXXXXX.us-west-1.elb.amazonaws.com/
And no, EC2 instances are also available to the internet gateway with a public url - One of these instances is currently being used for serving the application publicly, and it's working just fine for that. Just want some redundancy in case of failure, so I spun up another one.
Listeners is configured to only HTTP (port 80 on ELB, port 80 on instances).
I am pretty sure you just have to wait for 15-30 minutes before you will finally be able to resolve load balancer's IP address by DNS name. It happened to me when I was doing AWS tutorials.
Related
I face an issue in AWS Elastic BeanStalk health checking. I deployed to my NodeJS application to AWS via elastic beanstalk. Then I give permission my elastic load balancer TCP 443 port accessible for only my domain that is routed by Cloudflare. Basically, My elastic load balancer is only accessible by Cloudflare,
Due to the fact that I use Cloudflare, AWS health checks can not be able to access to the endpoint of the load balancer. How can fix this issue? I don't want to open my load balancer TCP 443 port to all world people. I want to open TCP 443 port for the only Cloudflare and, at the same time, I want to use health check of AWS :)
If somebody reads this question in the future, I thought that the health-check is being executed, externally - accessing publicly. But I have just learned that it was not :)). It is being executed directly internally. There is no problem related to Cloudflare or the security group or any other thing!
If there is an error in your ELB regarding this, the problem is probably related to your codebase, not the security group or other configurations.
I have a website that I have hosted on an EC2 instance that runs on port 3000. (e.g. 3.27.83.19:3000 - assuming the IP address of the EC2 instance is 3.27.83.19)
I have a domain that I have already bought mydomain.com through AWS that I already see in Hosted Zones.
How can I set-up Route53 so that when someone hits "mydomain.com", it takes them to 3.27.83.19:3000 rather than 3.27.83.19
Thanks!
point domain to instance ip
To point example.com to 3.27.83.19 you simply need to create an A record in route53
point domain to load balancer
To access the website running port 3000 on an EC2 instance through https://example.com, you need a service that accepts traffic on https://example.com and then forward the traffic to the EC2 instance on port 3000. You can easily do it with an AWS application load balancer. I like this approach.
There are many benefits using an application load balancer. The important one is that you can configure the SSL certificate easily. The application load balancer also supports host based routing which allows you to host multiple websites.
If you are looking for less expensive solutions, you can also go for setting up an nginx proxy inside the ec2 instance. I personally don't like this approach because you will need to configure SSL at the application level.
https://aws.amazon.com/premiumsupport/knowledge-center/public-load-balancer-private-ec2/
Hope this helps.
I just set up an EC2 instance along with a load balancer and a Route 53 domain. The domain is getactiveapi.com. I set up the load balancer to forward port 80 and 443 to 8080. I have a simple spring boot application running on port 8080. One of my spring boot endpoints is /test. I am trying to hit that endpoint with getactiveapi.com/test with no luck. Am I doing something wrong here?
You should debug this by breaking down the individual components.
The flow is:
Domain name
Load Balancer
EC2 instance (also, the Security Group acts like a layer)
Start by getting the IP address of the Amazon EC2 instance and try connecting to it from your web browser. If it works, then the problem lies in a higher layer.
If the application instance is in a private subnet, then first login to another instance in a public subnet of the same VPC, then try connecting to the application instance.
If the application instance is not responding correctly, try logging into the application instance and run curl localhost:8080. If this works, then the problem probably lies with the Security Group settings. If it does not work, then your application is not running.
To test the Load Balancer, get the DNS Name of the load balancer and try accessing it. If this works, then the problem lies with Route 53. If it does not work, then the problem lies with the load balancer configuration.
Keep moving through the layers (bottom-up) until you discover what is causing the issue.
I have configured and passed the health check for my AWS ELB(load balancer), but I was trying to do a ping or send a packet to the tcp port 9300 there is no ip address for the ELB.
I have an EC2 instance at the end of the ELB which has Elasticsearch running on it.
The ELB that I configured is an internal ELB so it doesn't have a public IP address for it.
I was wondering if there is a way I can ssh? or do something to ping the ELB?
I am pretty new to AWS and read all the trouble shooting from AWS official website, but couldn't find a solution.
The goal that I am trying to achieve is to test whether my internal Amazon EC2 load Balancer is working properly.
I got the internal ELB ip address with the ping command, however, I am not able to ping or crul to that IP address.
I what to know what I am doing wrong.
Is it the way that I want to access a private network is in correct?
An Elastic Load Balancer is presented as a single service, but actually consists of several Load Balancing servers spread across the subnets and Availability Zones you nominate.
When connecting to an Elastic Load Balancer, you should always use the DNS Name of the Elastic Load Balancer. This will then resolve into one of the several servers that are providing the load balancing service.
Load Balancers are designed to pass requests and return responses. The next time a user sends a request, it might be sent to a different back-end service. Thus, it is good for web-type traffic but not suitable for situations requiring a permanent connection, such as SSH. You can configure sticky sessions for HTTP connections that will use cookies to send the user to the same back-end server if required.
The classic Elastic Load Balancer also supports TCP protocol, but these requests are distributed in a round-robin fashion to the back-end servers so they are also not suitable for long-lasting sessions.
Bottom line: They are great for request/response traffic that needs to be distributed across multiple back-end servers. They are not suitable for SSH.
Site-note: Using PING to test services often isn't a good idea. Ping is turned off in Security Groups by default since it can expose services and isn't good from a security perspective. You should test connectivity by connecting via the expected protocols (eg HTTP requests) rather than using Ping. This applies to testing EC2 connectivity, too.
My app was easy deployed on 3 instances using OpsWorks. I can Access it using instance IP's fine.
My question is: how can I access it using load balancer?
ELB says all 3 instances are InService, but typing public DNS on browser, it loads forever and shows nothing.
Testing ELB public DNS on http://whatsmydns.com it shows IP's that aren't from my instances.
Am I doing something wrong?
I have added Public DNS to my app as hostname.
There are a couple things to check:
Check that your load balancer listeners are configured to listen
and pass traffic to the same port that the instance is listening on
(for example http traffic 80 => http 80, https traffic 443 => https
443)
Check that the security group of the webservers allows
traffic from the loadbalancer. Though if you can access your instances directly via browser, I'm guessing they are open to 0.0.0.0/0 so shouldn't be an issue here?
Check that security group of the load balancer allows access to public on all needed ports (typically 80 and 443)
Check that elb healthcheck is not failing (under elb
instances you can see if the instances are in service or not) If it
says "Out of service" that's the problem. You need to make sure that
healthcheck URL is accessible and returns 200.
The DNS of your load balancer is different from your instances - it returns the IP addresses of the instances that the load balancer is running on, AWS usually has at least 3 servers behind the scenes for that.