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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Haproxy load balancing TPS lower than single node

I have 2 apache2 servers running in the back end and have a haproxy between them and the clients. If I bench tested anyone of these apache2 severs with ab i get north of a 1500TPS however when I bench ...
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50 views

LVS load balancer machine can't query DNS on remote vIP

Server 1: Real ip: 10.0.0.11 Virtual ip: 10.0.0.10 (as seen by ip addr) DNS server listening on 10.0.0.11 LVS setup: IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler ...
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1answer
167 views

How to Add/Remove New Server behind Haproxy with Minimal Disruption

Haproxy is currently balancing the load between 2 servers, A an B. Clients are connecting to these servers via persistent TCP connections. Question: We want to upgrade from server A to a more ...
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69 views

Is it possible to use FastCGI_cache on nginx load balancer?

I am trying to setup a load-balanced small cluster to accommodate growing traffic on my WooCommerce site. The topology is going to be like this: Load balancer running nginx 2 application servers ...
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1answer
274 views

HTTPS health monitoring on rackspace cloud load balancer

I was using rackspace cloud load balancer to switch between two of my nodes. It was basically a active-passive setup in which the switch would take place in case primary node fails the http health ...
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152 views

Setting up LBnamed for dns

Thank for your listen and sorry If my bad English. I'm setting up load balancing for 2 server with Lbnamed (Stanford 's project). I just wanna test with simple architecture. 2 server have ip as ...
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2answers
433 views

EC2 Load balancer and wildcard/multi-domain SSL certificates

I am running three sites through one load balancer (and 2 child-application servers) One of the site's has an SSL certificate, but I'd like to add a certificate for the other two sites What is my ...
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2answers
260 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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2answers
268 views

How to get name of server that has served request in fronted section?

I need to add server name in response HTTP headers X-Servedby. Is there any way to replace [server] with name of server that has served request? frontend front x.x.x.x:80 default_backend balancing ...
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2answers
2k views

Using cloudflare as the only load balancer

Say I have 3 vps nodes in linode to serve traffic on a single website. Linode themselves provides a node balancing solution: https://www.linode.com/nodebalancers But I use cloudflare and was ...
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459 views

Can apache load balancer find if one of it's balancer members is down?

I need to know if apache can wisely and automatically detect if one of it's balanerMembers is down and consequently exempt it from serving the requests? P.S. The back-end servers won't produce ...
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298 views

Routing tables in OS/X Mavericks - causing traceroute: sendto: Cannot allocate memory

OS/X does most of its routing based on the order of the interfaces in 'Network Preferences'. I need to separate traffic, so I've put the default route first, and then routed traffic to the second ...
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57 views

Is it viable to run a script that serves images from database?

I run a very dynamic game review site. All the images (screenshots, game thumbnails, user profile pics, etc.) are served via a PHP script on the server. It takes the id as a parameter and reads the ...
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50 views

How can I configure my ASP.NET application to be navigable by IP address instead of URL?

I thought that IP address would always work for navigation to a Web site with a browser. I have rather recently asked this same question where the answer actually worked. See here Can I browse to my ...
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1answer
166 views

How remote instances work on Coldfusion Clustering?

I have just decided to set up my site using ColdFusion clustering in the staging environment. I need to find out what code adjustments are required when we move to a cluster environment. I have two ...
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1answer
298 views

Nginx Reverse Proxy Segfault on High Traffic

Recently my load balancer with Nginx rev proxy showing the following error messages on /var/log/dmesg: [6278902.558300] nginx[15683]: segfault at ffffffffffffffff ip 0000000000457b99 sp ...
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1answer
199 views

round-robin director ALWAYS directs request to the same backend

I've set up one server with Varnish as a load balancer and two servers running nginx/unicorn/sinatra for demo purpose. All three servers are accessible! My varnish vcl file: backend web2 { .host = ...
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2answers
134 views

FTP to multiple servers using one domain without load balancing

So i'm looking into how to allow users to FTP into different servers just through one domain such as ftp.mysite.com. Each of the servers will be unique in a manner of speaking, running their own ...
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1answer
32 views

Is it possible to set up load balancing and failover simultaneously?

Suppose I have two ColdFusion servers(different machines) running the same application. Now I am bit confused between load balancing and failover techniques. As per my knowledge, FailOver Cluster: ...
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1answer
729 views

Load balancing glassfish v4.0 CLUSTER with apache HTTP server: Location of apache

I am teaching myself to build clustered Java EE 7 applications. I am focused on Glassfish Server v4.0. Based on the official documentation (Chapter 7 page 133) , Glassfish can be loadbalanced using ...
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2answers
1k views

Outlook fails to connect to a load-balanced Exchange 2013 cluster through Direct Access 2012 R2

We have a load-balanced Exchange 2013 SP1 cluster, running MAPI over HTTP. Client connectivity inside our own network works just fine, while clients connected over Direct Access does not connect. The ...
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176 views

Does ColdFusion single server clustering using multiple instances provides any performance enhancement?

I have few doubts regarding Coldfusion clustering. Is there any benefits of Creating multiple instances of a single ColdFusion server, Create a cluster by adding those instances and host the ...
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1answer
735 views

Apache mod_proxy_balancer + Tomcat load balancing - Should not redirect until web applications are ready

I am using apache2 mod_proxy and mod_proxy_balancer to balance the load to 4 seperate tomcat8 instances on different servers. I am using different AJP ports for each tomcat instance and using jvmRoute ...
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2answers
120 views

SSL certs or intermediate for DMZ

I've been tasked with deploying and managing load balancers covering internal servers and DMZ servers. I have no experience with this, and this is a first for my organization as well. Balancers are ...
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1answer
35 views

Load Balancer Emitting Wrong Time in Http Header

Our intranet web app is behaving very strangely. Very often posting back (asp.net) to save form input end in no-action. After a month or so of on-and-off troubleshooting, I finally got around to ...
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1answer
518 views

HAProxy max out at ~10,700 connections

I am stress testing ejabberd with Tsung. My EC2 instances setup as follows: Tsung : c3.xlarge ejabberd : c3.2xlarge HAProxy : t1.mirco When I let Tsung talk to the ejabberd instance directly, I ...
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1answer
2k views

Direct several subdomains to a single backend with haproxy

I'm using haproxy to direct route for several applications running on a single server. For one of the domains in use there are several dozens of subdomains that should be directed to one of a few ...
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1answer
481 views

How to set up cluster with SESSION replication in Coldfusion 10?

I am not able to set up a cluster with session replication. I have successfully set up a cluster with sticky session. When googled I found a lot of links explaining the same issue, like ...
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101 views

NETSH : Set default ip address for an interface with multiple Ips

To test a load balancer I need to switch my ip address several time a day, and keep other ips routing trough other Wans. I run these commands in a batch script: netsh interface ip set address ...
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1answer
447 views

Amazon EC2 Web server in Load Balancer gives 503

we've been running our web servers at Amazon with load balancer and auto-scaling for over a year with no problem. All of a sudden today the request began to get aborted with the error: 503 ... Backend ...
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1answer
72 views

Replicate data across loadbalanced apache nodes

I am using haproxy that is pointing on 5 apache nodes, the problem is that I want to replicate apache data between those nodes. I have installed DRBD and it worked but on 2 nodes only The rsync is not ...
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1answer
110 views

Cookies Not Setting in Load-Balanced Environment

I have an Nginx load balancer load balancing two nginx servers serving PHP content (Moodle) up. They share the same database and use the same sessions directory using an NFS share on a separate ...
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34 views

OpenX Requests Multiple Logins on Every Request

We're experiencing an issue with OpenX 2.X and Varnish 3.x. Whenever an OpenX Admin tries to navigate through the backend interface by clicking on any link, OpenX shows the login page. For example, ...
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1answer
208 views

How to make Nginx fire 504 immediately is server is not available?

I have Nginx set up as a load balancer with cookie-based stickiness. The logic is: If the cookie is NOT there, use round-robbing to choose a server from cluster. If the cookie is there, go to the ...
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1answer
885 views

Configuring Azure Internal Load Balancer

I am attempting to configure a VNET using the new Internal Load Balancing feature in Azure. I plan to have 2 frontend servers communicating with 2 backend servers over an ILB (Internal Load ...
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2answers
484 views

Campus Network Design - Firewalls

I am designing a campus network, and the design looks like this: LINX is The London Internet Exchange and JANET is Joint Academic Network. My goal is an almost-fully redundant with high ...
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2answers
219 views

responses in nginx load balancing

Suppose I have nginx configured with 3 upstreams, and I make a request to download a file. One of the three upstreams will handle the request. Will the response come directly from the upstream? or ...
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2answers
313 views

Varnish ACLs Behind Load Balancer Based on Client's IP

In the following setup: Client -> LB -> Varnish I would like to configure Varnish acls to take certain action based on the Client's IP. The LB sends the client's IP in a variable called ...
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1answer
462 views

Load balancing in Nginx with redirect rather than proxy

I want to use Nginx in a bit of an unconventional way. I want to load balance between a few servers, but rather than proxy content for those servers I want to redirect to them. That is, if a ...
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1answer
90 views

What are the practices for load balancing web stats?

I'm admnistrating two servers with LAMPs which I need to set up as load balancing. I was wondering what are the best practices to deal with statistics? my two apaches will generate each their own log ...
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47 views

Cloud load balancers

Can cloud balancers balance HTTP requests coming from a single keep-alive connection? I have 6 machines under LB, and 3 connected clients pumping about 1000 HTTP reqests/second each. I observed that ...
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1answer
288 views

NLB ARR cross-node setup

Given: one ASP.NET web application 2 Windows servers with IIS installed (no more servers allowed) I want to enable load balancing / failover for that application, on both server and application ...
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1answer
56 views

Is it possible to use planet scale load-balanced virtulisation? [closed]

there are more and more implementations of distributed-virtualisation. A common one is Microsoft SCVMM. Currently, such things are kept inside LANs, and a san or fiber-channel system is used for ...
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3answers
391 views

Pros and Cons of dedicated Load Balancer vs Round Robin DNS [closed]

2 Apache web servers with identical vhosts to serve a few hundred clients. RHEL 6 on all boxes. What are the pros and cons to having a load balancer with a VIP, and pointing all of the DNS A records ...
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2answers
126 views

Load balancers and calling external web services

I've tried searching for an answer for this question, but I'm not sure if there is a specific term for it and so far I can't find any information. If I had a popular app that consumed some web ...
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1answer
648 views

iproute multiple ADSL load balancer through VM

For a long time (2 years?) I have been running a virtual machine (Ubuntu 12.04 server) with a very basic outbound load balancing capability, sending different outbound connections out different ADSL ...
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1answer
57 views

SSHD to retrieve forwarded client IP

This is my use case: I have a bunch of hosts behind load-balancers and clients SSH through the load-balancer. The LB internally creates a new connection so the connection with the end-host has the ...
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2answers
190 views

Setting up a LAN with load balanced internet

I have been looking and researching for the last week on this but haven't found anything conclusive which might apply to the situation that we are trying to solve. I have a small start-up which now ...
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2answers
1k views

Windows Server 2008 R2 Network Load Balancing no balance

I set up a NLB cluster given two servers (WS 2008 R2). Each server has one NIC card which I set up for a static ip address. I assigned the cluster an internet name (MyCluster), and assigned it a ...
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1answer
289 views

Nginx drops connections

I'm having a setup where I use the linode nodebalancer (loadbalancer) for my nginx/php5-fpm servers. This balancer passive checks. These passive checks, check the status code of requests. If there are ...