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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127 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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230 views

Varnish 3.0.5 round robin director not balancing

I have an architecture with two varnish servers sitting in front of 5 webheads. Each varnish server is configured with a round robin backend director, but at times of moderate to high load varnish ...
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44 views

Multiple httpd with JBoss cluster: provide httpd HA

I have a working configuration like this: +-----+ +-----+ +-----+ +-----+ | i1 | | i2 | | i3 | ... | in | JBoss Cluster +--+--+ +--+--+ +--+--+ +--+--+ | ...
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37 views

Load balancing inconsistencies & AD server causing network crawl

We've configured a TS load balancing farm consisting of the Active Directory server which acts as the TS Broker and 6 Terminal Servers who are members of the farm. The load balancing is set to basic ...
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98 views

How does Round robin policy of MPIO work in Windows 2008 R2

I have a Dell server with a 1G dual port iSCSI adapter. I have installed the NIC driver and using Microsoft iSCSI initiator, map few luns to both the ports and enable MPIO. The target I used was ...
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151 views

Apache as Load balancer - forcing a break in persistent connection

I have setup a load balancer with Apache 2.2 via mod_proxy and mod_proxy_balancer. The load balancing works just fine, but there is one case I cannot find any configuration options for, namely, while ...
2
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355 views

lvs with NAT routing - horrible performance to one real server

I have an LVS setup with NAT routing and two real servers (as an FYI, we're only routing http on tcp port 80). Currently requests to real server A respond just fine, with page load times of 3-4 ...
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159 views

Cannot browse HTTP to a load balanced VIP from w2k8 boxes, but can get to it from w2k3

I have a strange problem and am looking for suggestions. The environment: several VLANs on the same switch, that all talk to each other via the ASA using hairpin routing: VLAN 500 - Windows 2003 ...
2
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219 views

WS2008R2 - Network Load Balancing and IIS - I have no idea

I'd like to avoid discussion of IIS ARR for now - it isn't essential to get NLB working. I have two computers (both in the same domain, btw) who are connected to two networks: A private internal ...
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954 views

nginx sticky sessions / ip_hash with Socket.io

I am to be load balancing two node.js/Socket.io instances on different boxes with nginx running a simple notifications service with a retroactive event for new clients. I don't think there will be ...
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54 views

TCP load balance authentication

Impala is a piece of Cloudera software which implements an ODBC driver on a desktop, which then connects directly to a Hadoop cluster. In our implementation, our Hadoop cluster sits behind a DMZ, in ...
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62 views

File access randomly breaks returning 500.19 erros on IIS

We have two web servers running IIS 8.5 on Windows Server 2012 R2. The two servers are located behind a load balancer. The web servers are running a ASP.NET MVC application which, among other ...
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64 views

Writing to Windows Azure Web Sites file system when using multiple Instances

Let's say I have a Windows Azure Web Site instance which I deploy a simple app like Ghost Blog. Will a write to one instance be seen by the other instances? Say I upload an image, or write a post to ...
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61 views

Load balacing between balancers using mod-proxy-balancer

Using Apache mod-proxy-balancer, I would like to balance between two balancers. Is this possible? Background: We are in process of upgrading some of our server stack, and for a deployment process we ...
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50 views

Pound sticky sessions between HTTP and HTTPS

I have pound setup for http and https, and have sticky sessions based on cookie for both. However, sessions are not sticky when jumping from http to https. Is there anyway to do this in Pound? It's ...
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315 views

Nginx load balancing redirects to upstream “name”

Introduction: Please read this serverfault question on nginx load balancing issue with 301 from backend. Somewhat similar to my problem, but the answer doesn't work. Nginx is redirecting to the ...
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39 views

Cisco configuration for public library internet

I'm a C/C++ computer programmer turned IT support guy working for a public library. My day is usually spent helping random grandparents learn how to use email, so my networking knowledge is limited ...
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34 views

Changing Cassandra Tokens on 1.2.1 From 4 to 256

We initially started our cluster using one datacenter, one rack, and the Simple replication strategy. We have keyspaces with several hundred gigabytes of data. When we changed the tokens in the ...
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127 views

How to tell uWSGI to prefer processes to threads for load balancing

I've installed Nginx + uWSGI + Django on a VDS with 3 CPU cores. uWSGI is configured for 6 processes and 5 threads per process. Now I want to tell uWSGI to use processes for load balancing until all ...
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377 views

How to Configure TimeOut For AJP connector

I am using ajp connector to connect to J BOSS nodes from Apache, ajp is configured to accept 400 concurrent connections by setting max Threads to 400, but few my connections are getting timeout. Where ...
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271 views

High latency on domain with CDN

High latency on domain with CDN I have problems with latency on my server, these are the tests I made with blitz.io Latency album http://imgur.com/a/bCmwo I would uploaded images here but it ...
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70 views

Linux IPVS in DR mode: VIP unreachable for director

I use direct routing mode. How do I make the loadbalanced service available to the director (DIR) using the virtual service ip (VIP)? When I try to connect from DIR to the VIP, Linux (3.2.0) sees ...
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128 views

Setting up balancer-manager with mod_status on load balancing apache machine

I am setting up a Centos machine with Apache running on it for load balancing between two application webservers. Normally I would do all this with an F5 (or other hardware LB) but the customer is not ...
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103 views

Any way to route MSMQ messages based on label?

I have a system with one MSMQ sender (generates about 10k messages/sec) and one MSMQ receiver (2k messages/sec). Generating and sending messages is fast, reading and processing is slow. Hence I want ...
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89 views

Nginx doesn't rebound from 502 Bad Gateway

We have a situation where a site starts to serve a 502 Bad Gateway but doesn't seem to recover after the upstream servers rebound. The nginx server is setup to proxy/load balance requests for two ...
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32 views

Prevent NGINX from rerouting to a backend that was previously down

I'm using NGINX's ip_hash directive to ensure that client requests always end up at the same backend server. In the case of a backend server outage, NGINX will reroute to the available server, and ...
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133 views

mod_cluster and Tomcat load balancing design

I am fairly new to Load balancing. I am able to setup a load balancer using Apache httpd, mod_jk and tomcat. Now the problem is we would like to have design in the following manner, ...
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188 views

Load Balancing Ethernet LAN & WIFI on linux?

I have configured two internet connection to my Linux box, first Ethernet LAN with range 192.168.2.1 & WIFI with range 192.168.1.1 this both connection are connected to 2 different internet ...
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164 views

How to add domain to Cisco ACE sticky cookie value?

My Cisco ACE, by default, sets the sticky cookie to not have a domain set. This has the effect of serving the sticky cookie under the domain of the host requested: ...
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69 views

Benefits of ARR in a load balanced environment (Azure)?

I've built a simple IIS 8 web farm on Azure VMs. The web farm has 3 instances (Windows Server 2012) using shared configuration. The load balancing is handled by the Azure's built-in load balancer. ...
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47 views

How to Load balance on the basis of same content to the same backend server

I wanted to send all the requests for same content to the same backend server. How I can do this. Are there any open source versions like HaProxy which can do this. For example. Client 1 has ...
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292 views

Squid on windows loadbalancing only to one server

After thousands of googles and trying days i cant get the load balancer/failover in squid on windows to work. Iam using squid 2.7. My webservers are 2 single NIC lighttpd and one dual nic lighttpd. ...
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300 views

haproxy read: timeout error?

I want to configure Haproxy for outgoing mails load balancing on my centos 5.6 vps server. for this i have installed postfix on load balancer. My postfix sasl configuration as follows to use Haproxy ...
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63 views

trying to understand network layer(s) in WebAPI server cluster

I'm in the process of building my first webAPI server cluster. The webAPI hosted by this cluster provides a hi-comute resource, where each task request requires between 0.5 and 1.0 seconds of CPU ...
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423 views

pfsense + haproxy + stunnel as reverse proxy with load balancing and ssl terminaltion

i have this topology as title says with a pfsense with installed haproxy and stunnel. Because i saw that haproxy can't do ssl termination i thought about stunnel. But i don't know how to set up it. My ...
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593 views

linux firewall + load balance ISP connections

I'm trying to get a linux Mint computer with 4 NIC's to act as a load balance server. The idea is that we have three internet connections, and we want to use all of them so we can share usage of 50 ...
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345 views

Apache httpd active/passive setup

I want to setup apache web server in active passive mode to support HTTP failover on Redhat linux 5 machine. I understand that 2 Linux boxes can be setup in HA using heartbeat or keepalived. Also, ...
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88 views

ServerIron: How do I configure a real server to be in 3 VIPs at the same time?

I'm forced to work on an old piece of hardware: Foundry ServerIron 450 I have a host that needs to be in 3 VIPs at the same time: 10.1.1.21:3333 aka (host-a:3333) The problem I'm having is that when ...
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264 views

Can Cisco ACE load balance ISPs?

There is an interesting usage of the Cisco ACE to balance output internet traffic through different ISPs, as explained here https://supportforums.cisco.com/thread/2110390. Basically, it would be set ...
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108 views

Local load balancing and using cloud services when needed

Suppose a company has a set of web+data servers that are load balanced, but sometimes the application gets a burst that goes beyond server capabilities. This would nicely mitigate the cost of cloud ...
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180 views

Bad request 400 Error when using parent cache node

I'm trying to design a load balancing system with a parent cache. I have 2 Child Cache servers with ARR and Network load balancing features installed. (vServer2008-1: 10.7.10.90, ...
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1k views

ISC DHCP fails to sync leases between peers

I use ISC DHCP version 4.1.1 on Debian GNU/Linux on both servers. I tried to solve the following problem using various versions of ISC DHCP but it remained the same. My configuration for failover ...
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336 views

Performance issues on LAN with Load balancing

I recently set up a network which is running "slow" and I can't seem to debug the situation. I'm fairly noobie at networks I'll explain the setup and hopefully you can give me possible solutions. I ...
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440 views

Load balancer unable to contact a server through http

In our infrastructure we have a load balancer(apache mod_balancer) and three backend servers that run apache as a web service and iptables as firewall, Lately ONE of them is giving a lot of " ...
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352 views

IIS7.5 Application Request Routing for multiple sites on one WebFarm

I am running some test scenarios with setting up a server farm using Windows 2008R2, IIS7.5, WebFarm Framework and Application Request Routing. I have three servers: WebFarm1 Controller ...
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599 views

squid and parent/sibling

I tried to configure sibling on my caches in order to let them talk with each other and it never works; udp_miss000 is the error. The only way that worked is to to make one of them parent, but still ...
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1k views

Load-balancing between a Procurve switch and a server

I've been searching around the web for this problem i've been having. It's similar in a way to this question: How exactly & specifically does layer 3 LACP destination address hashing work? My ...
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192 views

Application force A10 Load Balancer to Switch server

In a previous network configuration, we used load balancers (Coyote Point) that we could direct in application code to switch the user to a different server (via cookie modification). Is there some ...
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30 views

How do i know if i set up the nlb (network load balancing) correctly?

I'm working on a web conference were we are going to show about 12 videos for a total of about half a gig for all 12 people. Since the participants are going to be watching (and also ...
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24 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, ...