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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How to construct a MongoDB Health Check in HAProxy?

There is a fastcgi example of a binary health check on the HAProxy blog. How would I construct a similar check for MongoDB such that I am doing a more robust health check for MongoDB - one that ...
5
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3answers
753 views

nginx - Load Balancer - Considerable lag when upstream node is offline/down

Running nginx 1.0.15 on CentOS 6.5. I have three upstream servers and everything works fine, however when I simulate an outage, and take one of the upstream servers down, I notice considerable lag in ...
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1answer
78 views

load balancing multiple connections over multiple links

As I understand it (based on the kernel docs) the setting of "arp_filter=1" necessitates the use of a source based routing policy to allow multiple interfaces to route traffic, potentially (but not ...
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1answer
40 views

ssl and loadbalancing : answer directly from backend?

Context debian 64bits. I try to learn https. I created a loadbalancer but I cannot answer tthe client directly from the backend since it receive the LB ip. Question I would like to know how I ...
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1answer
116 views

Multiple Proxy servers - and how to get around non-SNI devices?

We have a lot of devices that cannot use SNI and we want to be able to proxy a lot of HTTP/HTTPS servers. I was thinking we could setup a HAProxy for each URL to connect to initially, and then load ...
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1answer
181 views

How to proxy traffic by IP using server names/aliases?

We have 5 different server locations each containing around 30 servers each, each server represents a URL and serves both HTTP and HTTPS. They're all identical however provide different content based ...
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2answers
101 views

How to balance the root domain using NS records?

I have two load balancers that balance incoming traffic across multiple data centers. These work fine. I can test them out by doing an nslookup example.com xIP I have now taken out DNS services with ...
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1answer
146 views

Working WCF WebServices with NLB server

Im starting the architecture of a new project using WCF, but im not the right person to make some network considerations, so im doing some research but cannot find the answers to these questions: ...
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1answer
53 views

When load balancing, must all copies of static web page be exactly the same?

I am used to get answers for everything on the web, but not this time... Yesterday I enable Amazon DNS weight functionally to load balance 7 websites between two different IP addresses (split ...
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1answer
741 views

HAProxy error: Some configuration options require full privileges, so global.uid cannot be changed

After adding the line to /etc/haproxy/haproxy.cfg as part of creating a transparent proxy, source 0.0.0.0 usesrc clientip restarting haproxy starts giving an error ~# service haproxy reload ...
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1answer
644 views

Using 2 Transparent HAProxy for load balancing

We can configure HAProxy to be a transparent proxy by using the guide here, where one of the steps says ...to put the backend servers in a different subnet to the front end clients and make sure that ...
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1answer
687 views

RTMP Proxy Server

I have an application which uses both HTTP (content data) and RTMP (video streams) for communications. An nginx server is configured for load balancing and proxying incoming client requests. It works ...
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1answer
41 views

Apache loadbalancing - how to get reported about server fault

I am a newbie about load balancing so sorry if the question is trivial. I set up a basic load balancing using one server as a load balancer (planning to add at least one more with heartbeat) and for ...
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1answer
132 views

HAProxy - proxy to webserver via tcp

I have a simple web application, All requests to that application are HTTP based (RESTfull API and standard ajax) I have an haproxy before my tomcat cluster. So now i have clients that http request ...
2
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1answer
2k views

Dynamic HAProxy configuration

I try to figure out a way to dynamically manage the loadbalancer configuration. I want to add and remove "service nodes" depending on the overall system load. My research so far revealed "Thalassa" ...
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2answers
98 views

sending requests from many IP's [closed]

Is there a service I can use to balance requests between many IP addresses? I need to run some tests and want to send out http requests from a pool of say 100 IP addresses. I don't want to incur the ...
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0answers
104 views

Load Balancing Nginx

Okay I have edited my question :) I would like to point all traffic at my dedicated server running Nginx and have that handle 70-80% of the load while also distributing the traffic to some other VPS ...
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0answers
197 views

Can stunnel be used to round robin tcp connections without SSL?

Today, I'm already using stunnel to provide SSL termination to a set of TCP services where the connections are round-robin'ed, this is done, for example, like follows: [myserv] accept = 443 connect = ...
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1answer
330 views

Can HAProxy reconnect a websocket to another backend server transparently?

I'm new to HAProxy so this might have an obvious answer but I wasn't able to find it. Consider this setup: two backend web applications; one HAProxy in front of the web applications; many clients ...
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0answers
63 views

Should load balancers ever use TLS session ID to direct traffic?

One of my vendors caused an outage today by using TLS SessionID (sent by the browser) as a way to determine which host to direct traffic to. Since SessionID can leak privacy details, and more ...
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0answers
37 views

Can Azure load balancing, balance to several ports on one (or more) VMs

I have a single threaded application (on an Azure VM), which I want to run one instance per cpu core. I will need to use one port per instance. (e.g., ports: 81,82,83, and 84) Is it possible to load ...
2
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2answers
3k views

Apache mod_remoteip and access logs

Since Apache 2.4 I've started using mod_remoteip instead of mod_extract_forwarded for rewriting client address from x-forwarded-for provided by frontend servers (varnish, squid, apache etc). So far ...
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0answers
55 views

is it possible to have reqrep for each server in haproxy loadbalancer?

There are 3 servers in a load balanced HAProxy setup. server serv1 192.168.1.101:8080 check inter 2000 rise 1 fall 1 server serv2 192.168.1.102:8080 check inter 2000 rise 1 fall 1 #The ...
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1answer
316 views

Load balancing Bind9 with Keepalived and LVS

How can I correctly configure LVS to masqerade/NAT packets from virtual ip to/from clients? Currently I have: UDP 10.47.1.80:domain rr -> 10.47.1.51:domain Masq 10 0 ...
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0answers
309 views

AWS - elastic load balancer unable to handle the request

I'm totally new to AWS and the world. My problem here is while requesting to AWS server. I have a server staging-storage.zazzercode.co pointing to following DNS's with respective load balancers, ...
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0answers
80 views

In Route53, balance traffic between ELB and other IP v4 addresses

Using Route53, is there a way to round-robin to a combination of ELB's and IP v4 addresses? I have three load balancers, two are external to AWS and one is an AWS ELB. I want all three load balancers ...
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1answer
367 views

F5 vs Windows Network Load Balancer

I am using Windows Server 2012 R2 for deployment of Microsoft Dynamics CRM 2013. I can use F5 as its available. I want to know the criteria for deciding F5 or Network Load Balancing. Which is better ...
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1answer
560 views

Network load balancing: LACP between Debian & FreeNAS over Cisco Switch doesn't work

My setup: 2 Debian Server, with Bonding 2 Storage Server FreeNAS with Link Aggregation 1 Cisco Switch SG-200 with LAG enabled MTU 9000 enabled everywhere Result: Network performance is still single ...
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1answer
863 views

Haproxy sticky session not redirecting to different server when backend fails

I have the following configuration for my haproxy LB: global daemon maxconn 2048 # SSL ca-base /etc/ssl/certs crt-base /etc/ssl/private ssl-default-bind-ciphers ...
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0answers
179 views

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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0answers
58 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 ...
1
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1answer
180 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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0answers
79 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
325 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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0answers
174 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
492 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
309 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 ...
4
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2answers
346 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
3k 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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1answer
592 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 ...
0
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1answer
326 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 ...
0
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1answer
71 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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1answer
179 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
355 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 ...
0
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1answer
238 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
158 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
33 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
825 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 ...
18
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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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1answer
196 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 ...