ELB is Amazon's managed Load Balancer service, used in conjunction with its EC2 virtual machine cloud hosting service.

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How do I troubleshoot latency issues with elastic load balancer (ELB) in Amazon AWS?

We have a web app and API hosted at Amazon AWS, with three environments - development (dev), testing/staging (uat), and live. Each environment has a load balancer, two EC2 instances and an RDS ...
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2answers
37 views

Application access via AWS Load Balancer with autoscaling

I am configuring a test AWS architecture for a web application that I plan to migrate from a dedicated hosting service to AWS. What I have now is as follows : One MySql RDS, where my application ...
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3answers
76 views

Is AWS's Elastic Load Balancer a single point of failure?

I am looking at moving our application up to Amazon Web Services. The plan is to have all of the EC2 instances mirrored across two availability zones. Due to data transfer costs, we will be staying in ...
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21 views

AWS ELB health check potentially remove all instances

So, when using AWS ELB, there's a health check url we use to ping db server / check out bound connection, etc. If there are unhealthy instances, they are removed. But if the db server is down, our ...
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2answers
57 views

Why can't I create an Alias Resource Record Set for an EC2 instance [closed]

I have been working with AWS for over a year, setting up EC2 instances, domains, ELBs, etc. When I want to assign a subdomain to an EC2 instance, I have to create an elastic IP (that I pay for), ...
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89 views

Instances slow when connected to AWS load balancer

I have setup 5 t1.micro EC2's behind an AWS load balancer. All the instances slow down once they are connected to the LB. Eight out of 10 requests takes more than 30s even when I do the requests ...
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33 views

No longer can get nginx.conf to respect my redirect rules

I want to redirect all sites and subdomains to one https domain name. I'll use https://my-site.com as an example. Previously I had all the redirection working with the following code: server { ...
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1answer
75 views

Amazon CloudFormation: How to get an ELB's private IP for a specific subnet?

TL;DR - Is it possible for a CloudFormation template to insert the subnet-specific internal IP address of a specific ELB into the UserData of an instance within that subnet? We have a fleet of EC2 ...
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2answers
489 views

How do I rotate an SSL Certificate as requested by AWS

Amazon AWS sent an email today that users using Elasic Load Balancing (ELB) service with SSL certificates should "Rotate" them for precaution (Heartbleed bug). How exactly do I rotate an ssl ...
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4k views

Does Heartbleed affect AWS Elastic Load Balancer?

The Heartbleed OpenSSL vulnerability (http://heartbleed.com/) affects OpenSSL 1.0.1 through 1.0.1f (inclusive) I use Amazon Elastic Load Balancer to terminate my SSL connections. Is ELB vulnerable?
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39 views

ELB Health Checks incorrectly failing / being unhealthy

Over the weekend, our instances have started being marked as unhealthy, and not being enabled within the load balancer. When going to the public DNS of the instance, followed by the healthcheck.html ...
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82 views

AWS ELB stops showing instance as healthy and access logs show no entries

I have a load balancer configured in a public vpc subnet to route traffic from HTTPS (443) to an instance in a private vpc subnet over HTTP (8080). The setup worked fine for about 24 hours, until the ...
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Get AWS ELB name from an attached instance

I created one ELB and attached a few instances to this ELB. So when I login into one of these attached instance, I would like to type a command or run a nodejs script that can return me the its ELB ...
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2answers
36 views

How do I configure AWS to host my apex domain?

I have several apex domains that all point to the same website. I am migrating it to AWS, and I need to figure out how to route requests to my ELB. I know I can't create a CNAME, but what are my other ...
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1answer
74 views

Should I stick with ELB? How bad is a DDoS attack of 2 million packets per second?

I have an Elastic Load Balancer (ELB) on Amazon Web Services under DDoS attack (specifically a SYN flood) that Amazon has said occasionally hit over 2.4 million packets per second. While it hasn't ...
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50 views

ELB healthcheck with multiple applications on same instance

Right now we're in the process of migrating our application on AWS, and we plan on having two applications (java war) on each instance ( We're using Tomcat as our application server). One of them has ...
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2answers
93 views

Avoid Man in Middle AWS load balancer

I have a load balancer configurated with the port 443 to port 80 of the ec2 servers and with a sniffer like Burtsuite can I edit the request. How can configure the ELB to avoid this type of attack?. ...
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2answers
176 views

How to configure Amazon ELB ping target for haproxy

I'm trying to setup Amazon ELB to route requests to couple of haproxy servers. ELB requires a ping target to the respective servers for health check. It uses index.html at port 80. I'm struggling to ...
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66 views

adding an ELB to an existing Auto Scaling group

I just created two new ELBs, and I'm trying to figure out how to add one of them to an existing autoscaling group; so far the only way that this seems to be possible is by recreating the already ...
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2answers
202 views

Elastic Load Balancer for multiple webapps

I have N webapps. Each webapp is served by a different hostname in my domain and deployed to 2 instances running in AWS. In other words, I have 2N instances, divided into pairs which run N distinct ...
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1answer
204 views

AWS WebServer architecture (ELB + iptables)

I'm currently working on the architecture of high-traffic high-availability website. We are using AWS. Currently, we have: Route 53 -> ELB -> Multiple EC2 instances -> RDS Multi AZ. Each EC2 ...
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1answer
97 views

Load Balancer on Amazon does not have secure flag set for Cookie

We have a java based application running on Amazon and have configured our Amazon ELB to connect to them successfully. However, we are seeing that the Cookie flag not set as Secure. Name Value ...
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1answer
50 views

Dynamic Load balancer in public VPC outbound trouble

I'm trying to setup a Load Balancer within a VPC and am having trouble setting up outbound connectivity. I've seen lots of posts saying that I need to put the instances in a private subnet to let them ...
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1answer
296 views

AWS EC2 Instance Auto Scaling Confusion

So first off I'm completely new to AWS so bear with me. I have had one instance running for a few months now and I now need to autoscale it as I am getting bigger traffic spikes and it gets ...
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33 views

EC2 node not accessible with ELB, issue on O2 netwrok

Issue: We have some website hosted on EC2 in N. Virginia region and it was working fine across globe, until some of our customer reported from UK region reported that they cannot access our site. ...
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1answer
77 views

How do I allow access to an AWS Elastic Load Balancer over the DNS name?

I have an ELB. It has the address myelbname.eu-west-1.elb.amazonaws.com as one would expect. I also have an EC2 instance behind that ELB. The load balancer is saying that the instance is healthy (the ...
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1answer
60 views

Using Amazon Load Balancers to route traffic to private servers outside Amazon

I'm looking into using Amazon Elastic Load Balancing (ELB) in order to reduce downtime when a server goes down. Basically, I don't want to change the relevant DNS records and wait for DNS propagation ...
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1answer
151 views

AWS: Forwarding HTTPS to HTTP via ELB

I'm having issues setting up HTTPS on AWS via a load balancer. I've managed to get as far as proxying my standard :80 server, via HTTPS on the load balancer, so requests to https://www.example.com are ...
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3answers
420 views

How can I use https with AWS Cloudfront without paying $600 to upload my cert?

I can host a dynamic website through Amazon CloudFront because they have CNAME Wildcard Support. However, some pages of my Site use HTTPS. Amazon have some documentation about how to associate your ...
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1answer
418 views

EC2 ELB Wildcard SSL Renewal “Invalid Public Key Certificate”

We have an existing ELB on EC2. It's got a GoDaddy issued wildcard ssl cert. I've downloaded the new .crt and gd_bundle.crt from GoDaddy. In ec2 I go to the load balancer, click the certificate, ...
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443 views

how to forward godaddy domain to ec2 load balancer

I have a domain with godaddy: example.com I have an ec2 load balancer pointing to an ec2 instance. I would like to example.com to point to my load balanced instance. I first added a www cname ...
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38 views

how to change security group of aws ec2 load balancer?

I created a new load balancer in aws. It has a a security group assigned to it that does not exist in my security group list, but one that existed long ago. How do I associate the elb with an ...
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149 views

nginx behind AWS ELB, unable to https rewrite to non standard port

I don't have lot of experience with nginx. Problem at hand is that nginx is behind a AWS ELB and listeners are(Load balancer port -> Instance Port): HTTP 80 -> HTTP 81 HTTPS 443 -> HTTP 80. Each ...
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49 views

Amazon ELB timeout on multiple instances but not on single instance

I have an Amazon load balancer and one EC2 web instance behind it, and websites work fine, all my websites do not require long processing time, they are just some basic PHP sites, then I spun up ...
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1answer
106 views

What sort of updates do ELB properties support (for CloudFormation)?

Question: What type of updates do each ELB property support? I'm reading through the ELB CF docs: AWS::ElasticLoadBalancing::LoadBalancer ...
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230 views

What exactly is an invalid HTTP_HOST header

I've implemented Django's relatively new allowed hosts setting, which is meant to prevent attackers from submitting requests with a fake HTTP Host header. Since adding that setting, I now get ...
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123 views

How to have SSL on Amazon Elastic Load Balancer with a Gunicorn EC2 server?

I'm a self taught back end engineer so I'm learning all of this stuff as I go along. For the longest time, I've been using basic authentication for my users. Many developers are advising against this ...
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2answers
179 views

Does amazon provide secure networking between servers

For example, suppose I have an ec2 instance and an elastic load balancer, is it safe to receive HTTPS traffic at the loadbalancer and forward it (unencrypted) to the instance. I've enabled the ...
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ELB -> Nginx -> Unicorn, force SSL through nginx

I'm running rails application behind nginx and balanced using Amazon Elastic Load Balancer. The whole application is SSL only, and currently SSL is enforced on the RoR level. It works like that: ...
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1answer
376 views

How do I host multiple SSL websites on a single EC2 instance using Amazon Elastic Load Balancers?

If I have 3 separate websites which all require SSL (separate certificates) that I want to host on the same EC2 instance(s) across multiple availability zones so that we have the ability to scale and ...
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1answer
253 views

ELB can't proxy traffic to my EC2 instance

For some reason ELB isn't correctly forwarding requests to my instance on EC2. My setup is simply a micro instance with nginx/node, listening on ports 80 and 443. The instance gets the health checker ...
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2answers
155 views

Multiple Amazon EC2 With Load Balancing And MongoDB

I have an Amazon EC2 server where we run a webapp and MongoDB. We want add a second EC2 server and a Load Balancing to the same region. Load Balancing will redirect all web requests (80 and 443) to ...
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3answers
320 views

ELB, nginx, and multiple HTTPS applications

Let's say I have 3 different applications that all do HTTPS. Not all of them are high traffic so I run all 3 on the same "pool" of 3 EC2 instances. domain1.com/domain2.com/domain3.com all have their ...
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2answers
645 views

How to temporarily redirect traffic from an Elastic Load Balancer?

I'm running an application on Elastic Beanstalk, an whenever I need to deploy a new version, I need to: deploy the version on Elastic Beanstalk, which takes a minute or so patch the database with ...
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1answer
1k views

What algorithm does Amazon ELB use to balance load?

I found this in the official ELB documentation By default, a load balancer routes each request independently to the application instance with the smallest load. but an article on Newvem says ...
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208 views

What on my EC2 CentOS vm is dropping ELB HTTP packets but not direct connections?

I've got a simple webserver (apache only) running on CentOS's AMI on AWS inside a VPC. I've got both AWS Security Groups and iptables opened up for port 80, with no source requirements. I then set up ...
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70 views

Amazon ELB HTTPS Not working

I'm trying to get HTTPS working with AWS ELB. I've been trying for about an hour, but no matter what i try, i just get connection timed out when connecting via HTTPS. HTTP works fine, but not HTTPS. ...
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3answers
486 views

How do you use ELB's support for PROXY protocol version 1 securely?

Amazon's Elastic Load Balancer supports PROXY protocol version 1. This allows the server behind the load balancer to determine the original source IP address of a client connection. However, the ...
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1answer
733 views

Using an Elastic Load Balancer with a single EC2 instance on AWS

I'm using the AWS Free Tier, which gives me one free EC2 microinstance and one free Elastic Load Balancer, if I understand things correctly. I understand that usually ELBs are used when you are using ...
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1answer
1k views

Possible for HAProxy to perform a mix of SSL termination and passthrough?

I'm working on analyzing an intermittent load balancing failure in our application. Previously we had been using the AWS Elastic Load Balancer in the following configuration: HTTP 80 -> HTTP 80 ...