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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7
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420 views

HAProxy switch to backup on 500 errors and/or server down

I'm setting up an HAProxy in front of only 2 backend servers, with a particular configuration: any request should go to server A; but, if server A returns a 5xx error code, all request should go to a ...
3
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0answers
107 views

How to Reduce Failover Interval in HAProxy?

I have setup HAProxy and it is working fine. I observed that when one of the node goes down HAProxy detects that immediately, but switch-over / redirect existing traffic to the rest of working nodes ...
3
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320 views

Is it possible to use both an ILB and an ELB (listening on the same port) in the same Azure cloud service?

I'm building a test Lync deployment on Azure; yes, I know this is not supported, hence "test". Lync Front-End servers expose two set of web services, one for internal users and one for external ones; ...
3
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0answers
1k 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 ...
2
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0answers
65 views

Haproxy Nginx/Naxsi to Web servers not working

I have a haproxy/nginx/naxsi setup for load balancing and security. Traffic is supposed to come into haproxy then to nginx/nasxi then finally to the web servers if they passed the WAF. We also have a ...
2
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0answers
100 views

Loadbalancing and HA with SolrCloud?

I have a LAMP Application running with solr 3.x on one server for several years now. Now I am migrating due to heavy load to a setup with two dedicated machines where all services are loadbalanced via ...
2
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374 views

HaProxy giving - 503 Service Unavailable

I am using below configuring for performing loadbalancing for two Tomcat servers. And I configured HAProxy to perform SSL/TLS bridging/re-encryption. ...
2
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0answers
273 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 ...
2
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241 views

Clustering with Jboss EAP and Load balancing with Haproxy

I'm doing load balancing with HAProxy and use JBoss EAP as application servers. The Haproxy server is configured to route incoming requests to the application servers. How can I integrate Jboss EAP ...
2
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66 views

how to prevent loadbalancer from going offline?

i plan to setup a load balancer for a webproject but there is a major issue in my head: a typical loadbalancer would be: (provided by nginx upstream) Server #1 accepts all requests and forwards them ...
2
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270 views

WordPress behind haproxy: $_POST being reset

So here's the sitch: Load balancer (haproxy) delivering to 3 web servers and a database server, 5 servers in total with memcache sessions being shared between the web servers. I can confirm that ...
2
votes
0answers
1k 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 ...
2
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0answers
161 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 ...
2
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0answers
177 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 ...
2
votes
0answers
110 views

Multiple httpd with JBoss cluster: provide httpd HA

I have a working configuration like this: +-----+ +-----+ +-----+ +-----+ | i1 | | i2 | | i3 | ... | in | JBoss Cluster +--+--+ +--+--+ +--+--+ +--+--+ | ...
2
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0answers
87 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 ...
2
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0answers
559 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 ...
2
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0answers
392 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 ...
2
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0answers
266 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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0answers
567 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 ...
2
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0answers
241 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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0answers
256 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 ...
1
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0answers
71 views

Gitlab Images not found with nginx proxy (load balancer)

I have the following nginx config: server { listen 80 default_server; listen [::]:80 default_server ipv6only=on; root /usr/share/nginx/html; index index.php index.html index.htm; ...
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0answers
21 views

How to diagnose load balancer fault

I have an apache2 load balancer connected to two servers. Over the past month I have noticed that the load balancer gives preference to one server over the over even though there is no balance ...
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180 views

Exchange 2013 MAPI over HTTP Load balancing HAProxy

We have successfully managed to deploy HAProxy as a Layer-4 load balancer for all our Exchange 2013 SP1 HTTP based traffic (Autodiscover, OWA, EXP, EWS, MAPI, etc.) For various reasons, however, we ...
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53 views

Varnish - behind, in front of, or instead of load balancer(HAProxy/nginx)

I intend to run a few tiny ARM "physical cloud" servers behind a load balancer(either HAProxy or nginx itself), but i can't decide where to put Varnish in the whole mess. I can either have it on each ...
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40 views

Load Balancer Spillover

I want to be able to throttle incoming web requests but when a threshold is reached then I want to return a temporary redirect to a file on a CDN instead of passing the request to the backend. I can ...
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0answers
41 views

Security Group of AWS Load Balancer does not forward traffic to backend instance

Before I created the new security group (id sg-abcdefg), I am able to reach the load balance from the IP address 107.178.195.144 via http. The load balancer will then forward the traffic to the ...
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0answers
83 views

Google Cloud: Health Check is not removing failed instance from HTTP Load Balancer

I have an instance group with 2 instances behind a HTTP Load Balancer. one instance is up and functioning normally (returning http 200), the other is crashed (HTTP requests timeout). I am not ...
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0answers
225 views

504 Gateway Timeout on HTTPS but not HTTP

I configured an AWS Load Balancer. It is working find on HTTP, but when I try over HTTPS I get a 504 Gateway Timeout Error. I tried all the suggestions on AWS's help page (increase idle timeout), but ...
1
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0answers
45 views

Could HAProxy disable the Apache Instance on the same node it is running?

I have a setup with three VMs that are running on a core i74xx. The machines form a LAMP cluster with HAProxy doing the loadbalancing. After running multiple load tests I found out, that throughput ...
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0answers
24 views

Apache and long runnig servlets

I have an webapp deployed on 4 jboss instances and there is an apache 2.2.15 (mod_proxy, libs: DAV/2 mod_ssl/2.2.15 OpenSSL/1.0.1e-fips mod_jk/1.2.31) webserver doing the load balancing. The ...
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0answers
74 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 ...
1
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0answers
217 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 ...
1
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0answers
91 views

Setting up a caching system r/w in DCs across continents

We are going to implement a caching system to make our front-end servers which are located in different data centres in Asia, America and Europe can read and write some small JSON data in the shortest ...
1
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0answers
30 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 ...
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0answers
16 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 ...
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0answers
44 views

Is it reasonable to use an external website as a health check

I have a 4 proxy servers spread across a couple of datacentres that serve a large number of users on a WAN. These are load balanced using an F5 GTM located at each site. My goal is to write a health ...
1
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0answers
227 views

Haproxy backend server down due to layer 6 invalid response failed ssl handashake?

The scenario is we have two servers which are in different network . We want to have ssl communication from client to front-end and from front-end to back-end ! the front-end able to get ssl ...
1
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0answers
51 views

Apache mod_jk LB synchronization server startup + application startup time

after a long search I can´t found a solution or path to solve my problem with synchronization startup of Apache and Backend servers. I have a Apache2 using a LoadBalancer with mod_jk that balance ...
1
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0answers
426 views

How to get Nginx to quickly switch to backup upstream server?

I've using Nginx to load-balance a websocket app that runs in multiple Node.js instances. When there are thousands of active connections, a single message broadcast could make Node spin in place for ...
1
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0answers
204 views

NGINX + NodeJS Performance Issues

I have one server running a Docker + NodeJS application and a load balancer running nginx. Before upgrading to two servers, I wanted to attempt to replicate traffic statistics for the load balancer ...
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0answers
192 views

Load Balancing over multiple ISP connections

I have been trying to implement load balance and fail over on a linux machine having multiple interfaces. Currently I am using two ISP lines and I wish to split the network traffic such that both of ...
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0answers
114 views

Apache ReverseProxy sets upstream server to error when it returns an error page

We are using an Apache LoadBalancer/ReverseProxy to provide a failover for our web servers. Currently we are experiencing the following problem: A webservice call returns an error with HTTP status ...
1
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0answers
321 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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0answers
63 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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262 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
238 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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0answers
844 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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0answers
51 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 ...