Questions tagged [load-balancing]

Load balancing deal with the techniques involved on using multiple systems to deal with high demands, balancing the load between those multiple systems. Questions deal with networking and server load balancing, using dedicated hardware or not.

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Two network adapters for a machine to double the transfer speed [closed]

i am new to this. In my scenario, i have a desktop pc running windows 7 and planning to set up a local web server using xampp for big file transfer in the lab. The problem is that,there are 80 ...
Tibin's user avatar
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2 answers
4k views

Elastic Load Balancer awseb-e-g has zero healthy instances

I have an Elastic Beanstalk (EB) set up with a running application on a PHP/Apache server. The application was running OK since many hours ago when the EB's health got subtly RED and I don't know why. ...
cawecoy's user avatar
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1 answer
723 views

Nginx multi website multi public ip

I have deployed platform with archetecture where I have nginx lb server hash, behind is app server that has 4 apps. nginx lb server has configurations such as: upstream example1.com { ip_hash; ...
user3692800's user avatar
2 votes
0 answers
982 views

can AWS load balancer auto restart out of service images?

I have set up a load balancer with two instances in two availability zone I set up an health check to ping a specific page of my webapp now I'm trying to find if the load balancer health check could ...
Lorenzo Boccaccia's user avatar
0 votes
2 answers
327 views

ipvsadm: Access loadbalanced ip's from internal network

I have the following scenario: ipvs-Loadbalancer - direct routing: 123.123.123.117 Realserver 1: eth0: 123.123.123.123 eth1: 10.10.0.1 Realserver 2: eth0: 123.123.123.124 eth1: 10.10.0.2 Random ...
Christian's user avatar
3 votes
1 answer
2k views

ELB health checks for freshly launched EC2 instances not working

I'm trying to manually set up a load balanced environment using EC2. My instances are reachable via SSH and ping. However, as soon as I put them inside a load balancer, the instances are not able to ...
zerodot's user avatar
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20 votes
2 answers
21k views

Is it possible to use multiple load balancers to redirect traffic to my application servers?

I'm new to load balancing and I'm wondering if it's possible to use multiple load balancers to redirect traffic to my application servers. I don't really understand how this can be done. Shouldn't a ...
user3790827's user avatar
1 vote
0 answers
1k views

How to fix the amount of bandwidth of iperf in tcp mode?

I'm working on some experiments about my master's degree project. I'm studying some load-balancers (I'm not supposed to cite them here) and the aim is to get for each bandwidth the cpu % usage of a ...
user2567806's user avatar
1 vote
2 answers
325 views

How to replicate application in load balanced infrastructure

AWS use AMI (Amazon Machine Image) to copy the application server whenever new node (server) is deployed. How that work ? What sort of image is that ? What are other ways to do replication of ...
vivex's user avatar
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620 views

PFSense NATing to a load balanced server

I apologize for not being able to post the network diagram here but as this is my first time asking a question here I am not allowed. So here is the scenario: We have a site that is build with a ...
Scotty Golden's user avatar
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713 views

ARR Load Balance with two Machines - Always redirect to same Site

described steps for each setup. Created a sample Application WebShareTest , hosted the application in M1(IP 36) on port (80) and same Binary I hosted in M2(IP 210) (on port 8070) I pointed some ...
Akshay Joy's user avatar
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1 answer
212 views

Keep connections of closed instances behind a load balancer

I'm looking for a system to create a live sockets application through sockets.io and that can be balanced without problem. There are tons of solutions to balance the load between multiple socket ...
Jorge Fuentes González's user avatar
-1 votes
1 answer
512 views

ESXI 5.1 not balancing CPU load across all cores/threads

I have 2x servers with 2x E5645 (6c/12t). I am running own software which is processing millions of entries from database (database holds compressed big chunk of data in each row, software is ...
mike86's user avatar
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3 votes
1 answer
7k views

Google Cloud HTTP balancer returns 502 error

I have 2 Instance groups and HTTP load balancers for each one. Instance groups contain VMs that work on Windows Server 2012 with IIS inside. When I send POST request from VM from one instance group ...
Andrew Nikolin's user avatar
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1 answer
4k views

RTMP load-balancing via HAProxy

I've got a little problem to solve: I need to find a way to load balance, bandwidth-wise, the incoming RTMP streams on my servers. I have 2 RTMP servers (nginx-rtmp), let's call them S1 and S2. The ...
Canard's user avatar
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5 votes
1 answer
3k views

How does nginx distribute traffic among IPs associated with an upstream DNS name?

With this configuration: upstream some_upstream { server some-elb.us-east-1.elb.amazonaws.com:80; } If some-elb.us-east-1.elb.amazonaws.com maps to 2 IP addresses, how will nginx distribute ...
sandinymyjoints's user avatar
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1 answer
371 views

How to do load balancing with nginx

I need to use server as load balancer and web server at the same time. Here is my nginx config for website: upstream load_balancer { least_conn; server localhost; #server srv2....
loadFault's user avatar
1 vote
1 answer
6k views

HAProxy parsing errors

i have 3 servers --> haproxy - server1(uk) - server2(ru) i followed this tutorial and created ip for ru.subnets now in my /etc/haproxy i have these files: haproxy.conf ru.subnets ...
Ibbi co's user avatar
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2 votes
1 answer
2k views

HAproxy mysql failover

I try to set up a HA cluster with Percona xtraDB Cluster for MySQL replication and HAproxy for load balancing. HAproxy works really good with apache, when apache crash or if it's not responding, ...
CharlesS's user avatar
0 votes
2 answers
254 views

Azure, internet facing load balancer without using cloud services

Is it possible to have load balancing between virtual machines without placing the machines in the same cloud service? We want to use Ansible to configure our machines and setup RabbitMQ but I can't ...
olif's user avatar
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1 vote
2 answers
7k views

How do you Mask URLs in HAProxy?

Is there any way to do URL masking in HAProxy? I'd like to have a URL directing to my load balancer, i.e. www.example.com, redirect to another URL I have for another application. However, I'd like the ...
Grant's user avatar
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1 vote
1 answer
81 views

Correct way to load balance a node app in opsworks

I have an Opsworks stack with 2 different node apps running in the same layer. One of these apps needs to be load balanced as it will be accessed by the general public, but the other is only accessed ...
Carasel's user avatar
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0 votes
1 answer
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Nginx upstream fails over from serverA to serverB, and then back to serverA, why?

Background I have the following Nginx configuration which is load balancing 2 Tomcat servers running on 2 different servers: ### http://nginx.org/en/docs/http/ngx_http_upstream_module.html#hash ...
slm's user avatar
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1 vote
1 answer
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Internal Failover Load Balancing in Azure

I have a MongoDB Cluster deployed in Azure. Normally a MongoDB cluster has at least a couple of mongo router instances (mongos) which is where an application should connect (the application is also ...
artberri's user avatar
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1 vote
0 answers
2k views

Mapping uWSGI processes to specific cpu cores

I have 2 sites on my server (debian) with 4 cpu cores. For both of them I use workers=2 and cpu-affinity=1 so workers are mapped to cpu 0 and 1 for both sites like that: spawned uWSGI master process (...
alTus's user avatar
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1 vote
1 answer
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What is Refs column on varnishadm backend.list command?

Below is a command output example: varnish> backend.list 200 Backend name Refs Admin Probe webserver01(172.31.30.167,,80) 7 probe Healthy 6/6 webserver02(172.31....
Tomir Schmite Jr.'s user avatar
0 votes
1 answer
53 views

Wordpress on stage environment with SVN

Currently we have this configuration for our website: Stage environment. On this environment we use a connection to live DB and for code we use SVN. Production/Live environment. Load Balancing ...
morandi3's user avatar
  • 113
1 vote
2 answers
5k views

nginx load-balance set weight and ip_hash at the same time

By default the Nginx upstream directive uses Round-Robin to distribute requests to backend realsevers and set the weight of the server by weight. But I do not see any words about whether weight works ...
seanlook's user avatar
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2 votes
0 answers
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Error 499: Varnish is working how load balance Nginx Webservers

I created a solution to host a magento store with high traffic (> 500 user simultaneously) on AWS. Too often HTTP 499 error appears in the access.log the Varnish. When this happens users who have such ...
Tomir Schmite Jr.'s user avatar
3 votes
1 answer
688 views

Application Fail over not working in apache 2.2 web server configured with BIG IP (f5) load balancer

I am using Apache 2.2 in front of my JBOSS 5.2 application server in a cluster configuration . The two nodes of the cluster configuration resides on different host . This configuration is hosted on ...
ITSME's user avatar
  • 51
2 votes
1 answer
220 views

Load Balancing between 2 ISPs

I'm having 2 ISPs, need to balance traffic between the internal users ... Firewall is SRX210 The question is: Each ISP has there own DNS, how to make the dns resolving based on the used ISP? ...
MohyedeenN's user avatar
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3 votes
1 answer
2k views

Is having the same PTR hostname valid for multiple ip addresses? [duplicate]

Currently I have the following setup with two hostnames and two ips: cheeze1.mydomain.com IN A 123.123.123.111 111.123.123.123.in-addr.arpa IN PTR cheeze1.mydomain.com cheeze2.mydomain.com ...
dandan's user avatar
  • 158
1 vote
1 answer
5k views

Single Nginx Load Balancer for 2 different clusters (web, api)

I was wondering if it was possible to use a single Nginx server to load balance my web servers and api servers if both are using port 80. In this setup there would be 5 servers, 1 Nginx and 4 Apache ...
rand0mb1ts's user avatar
1 vote
1 answer
768 views

Moving a web application to use HAProxy, Varnish, and nginx

I currently have 4 web application servers (running on application) on Rackspace that sit behind a Load Balancer (on Rackspace). In front of the Load Balancer. The application itself makes moderate ...
tptcat's user avatar
  • 257
5 votes
4 answers
11k views

POST of large file is timing out, when running through ARR

When POST'ing a large file through ARR, the request times out after 120 seconds. The client recieves error code 502 Bad Gateway. I have configured the "proxy timeout" of the web farm to be 600 seconds....
Thomas M. H.'s user avatar
1 vote
0 answers
138 views

mod_proxy_balancer does not remove dead servers

We use the current configuration (slightly obfuscated) to balance 2 web servers against 4 application (Tomcat) servers, using JSESSIONID; each web server has this exact same configuration for ...
user99426's user avatar
0 votes
0 answers
272 views

Load balance and contingency server

everyone. I'm having trouble setting up a load balancing/contingency server. My scenario: I have 2 servers (Windows 2012 R2 machines) to run an application in ASP.Net/C#. My problem: Would I like to ...
PiLHA's user avatar
  • 101
2 votes
1 answer
2k views

Does Nginx keep the connection open, when it does load balancing?

I have a single Nginx server doing load balancing to several upstream servers. What happens when a request comes in? Does the load balancer keep the connection open and wait for an answer from the ...
jimmiw's user avatar
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0 votes
0 answers
530 views

Elastic Load Balancing report Out of Service

I am using the loadbalancing and autoscaling feature on aws. The load balancer marks the instance "out of service". However, the instance (i-xxxx) is running fine and status checks that report "...
Nataraj raj's user avatar
-1 votes
1 answer
98 views

What product is AWS Elastic Laod Balancer behind the scenes [closed]

Does someone know what kind of product is working behind the scenes as AWS Elastic Loadbalancer? Could likely be something as haproxy, nginx, etc. Does someone know more respectively has any proof ...
binaryanomaly's user avatar
0 votes
1 answer
5k views

How does a load-balancer manages end user http sessions? [duplicate]

I would like to know, How HttpSession works on Load balancer? How Load balancer knows for the particular request need to send the respective Web Server? Here's what I would guess: 1. load-balancer ...
Premraj's user avatar
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1 vote
1 answer
383 views

Nginx Load Balancing proxy confusion

I'm currently trying to setup a load balancer for a bunch of download mirrors. While reading into this subject I saw Nginx lends itself perfectly as a load balancer, great! But when looking at the ...
Lennard Fonteijn's user avatar
1 vote
0 answers
26 views

Php load balancing questions

I have a custom written ecommerce app that runs on it's own dedicated server. All of it's constants (such as database connections, file paths etc..) are defined in a single _constants.php file. The ...
danjfoley's user avatar
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2 votes
0 answers
2k views

Sticky sessions with Apache load balancer for Socket.io 1.0

I've been messing around with Apache as a load balancer for my Socket.io server. I went through the following topic and now everything seems to be fine. Configuring Apache 2.4 mod_proxy_wstunnel for ...
Peyman's user avatar
  • 21
2 votes
2 answers
13k views

Apache SSL Errors every 30 seconds

I have three load-balanced Apache 2.4.6 servers running on fresh installs of CentOS 7. The load-balancer is a Barracuda 340. I know its old, but it's more than capable of handling the traffic, and ...
spuy767's user avatar
  • 203
40 votes
3 answers
21k views

How to make redundant load balancers?

I understand that the purpose of load balancers is to balance load between your servers and keep track of instance health, etc. But what if load balancer itself fails? How do you set up redundant load ...
Sherzod's user avatar
  • 511
8 votes
2 answers
33k views

Redis high availability and load balancing

I'm using Redis for some time and now we want to move to a redundant cluster which would be fault tolerant, highly available and load balanced. I principally use Redis for some PHP web application ...
Mat's user avatar
  • 1,903
3 votes
4 answers
9k views

ELB Https with HTTP on backend using Tomcat without nginx or haproxy

I want to setup ELB to terminate SSL at load balancer and communicate with backend instances over HTTP. I have uploaded valid certificate on ELB. When I set up following configuration ELB - HTTPS ...
code13's user avatar
  • 173
9 votes
2 answers
15k views

Gracefully take a server out of Azure Load Balancer (drain stop)

We have an application deployed to Azure IaaS VMs, served by IIS. In order to install updates, we need to take each machine out of the load balancer, one by one. Before moving to Azure, we were using ...
nulldotzero's user avatar
0 votes
1 answer
1k views

Haproxy dynamically promote backup server to master

Let's say if I have two mysql databases, db1 and db2. Is that possible to configure haproxy to work like that: In the beginning: db1 work as master and db2 as backup. The haproxy will promote db2 as ...
elmoon's user avatar
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