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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Multiple Subversion Servers behind a load balancer

I'd like to add a little redundancy to my subversion setup. I'd like to have multiple servers share a common NFS mount and load balance http requests to the servers (with stickiness). Is this an ...
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2answers
2k views

Load Balancing DNS Servers: UDP / TCP

I have been asked to rebuild our load balancing infrastructure in the data center. The original request was to load balance FTP servers. I tried doing that using the current load balancer (Piranha / ...
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1answer
191 views

How to use environment variable in haproxy?

I work with haproxy 1.5.2 My haproxy.cfg has this server definitions: server HALB_ucd1 ${UCD1_END_POINT_IP}:${UCD1_END_POINT_PORT} check port 8444 I set the UCD1_END_POINT_IP and ...
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1answer
46 views

Azure Availability sets and CMS instances

We are hosting a CMS Site on Azure through a VM and IIS. To keep inline with Microsoft's SLA's we have to put the Front Ends in an availability set and then Load Balance them though an endpoint. This ...
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3answers
152 views

What's the point in redirecting users to “www2.”?

On several large-scale websites, I've seen being redirected from http://www.example.com/ to http://www2.example.com/ One of such examples is Netflix. My hypothesis is that this is used to: Either ...
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1answer
330 views

NGINX Internal Load Balancing + PHP-FPM Upstream causing random double request / submission

We are having a very serious problem where during seemingly random times, we get a duplicated request that is processed by our application. Typically, a user submits a form and occasionally will save ...
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1answer
97 views

Load balancing not possible with Zend Framework due to MySQL Adapter Error

I recieve the following error message when I set up load balancing between two servers that are running the zendframework called "SocialEngine" As it looks there is a problem that I can't connect ...
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1answer
77 views

Load Balancing VPN servers (Ubuntu)

I am trying to load balance two VPN servers, that are located quite far from one another. I am using Ubuntu with pptpd, is there anyway to load balance those two servers? So user connects pptp to ...
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1answer
249 views

Azure public endpoint SSL termination

In Azure, is there any way to set up an HTTPS endpoint directly on the public VIP, as opposed to joining each VM to a load balanced set, so that I can associate this endpoint with the SSL certificate ...
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1answer
83 views

HAProxy - Client Request Continuously Switching Servers

I have configured a Software Load balancer with HAProxy. Here are the details : Load Balancer 1 (Master) - 10.0.0.2 Load Balancer 2 (Slave) - 10.0.0.3 Virtual IP that load balancer shared is - ...
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2answers
661 views

How can I tell which server I've been load balanced to?

I want to test some configuration changes to one-way synchronisation between two servers that sit behind a load balancer (this is all Rackspace Cloud infrastructure FYI). The problem I have is that I ...
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3answers
233 views

Rewrite in Nginx Does not work for POST request

I have two VPS(one is for fail over), both running Nginx as a Load balancer for backend servers. Also, I have Enabled and configured SSL for my domain(registered on GoDaddy.com) on Nginx. Since I am ...
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0answers
182 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 ...
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206 views

ACL at HAProxy shows NOSRV

I have 3 backends in HAProxy 1.5.10: "WEB", "API", and "SSL" for web and api. For SSL termination I'm using ACL with SNI. Here is my config: frontend ssl mode tcp bind 0.0.0.0:443 ssl crt ...
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3answers
60 views

Does SSL need to be configured at the external load balancer if you are using one?

Using Elastic Load Balancer, it is easy enough to set up SSL at the external load balancer, and serve requests up as http to the applicaion. When running a single server, it is also possible to ...
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0answers
133 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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1answer
71 views

CRUD with MySQL Master-Slave Architecture

I have setup mysql master-slave replication with 1 master and 3 slaves. Now that I have finished setting up the architecture I am curious as to the best way to make my reads. I realize all writes, ...
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1answer
104 views

squid3 FAIL with cache_peer round-robin on 127.0.0.1 different port

I have 3 tunnels end to a Debian running squid3 (ports 9001 to 9003). At start of each tunnel runs a proxy. I try to load-balance those proxies this way: http_access allow all http_port 4128 ...
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1answer
68 views

Nginx Load Balancer having two load balanced nginx+php-fpm (Primary script unknown) error

We have two web servers with nginx+php-fpm ( 10.0.0.10 and 10.0.0.20 ), which is load balanced behind another nginx server ( just nginx ), when we try to browse we get file not found error, with error ...
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1answer
29 views

Apache Load Balancing And Network traffic Flow

I am using apache load balancing to load balance web requests to various other nodes, the problem I am having is during uploads and downloads, all the traffic is also being routed through my load ...
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2answers
70 views

Haproxy: How to balance traffic within directory reached?

I want to know if there's a way to balance the traffic within directories using haproxy. I have haproxy balancing all HTTP traffic to server1 & server2. What I want is to balance all images ...
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1answer
71 views

Permit access to website with load balancer (changing IP), disable rest with iptables

I need to block access to all websites except for a couple of URLs on a group of workstations. Apparently a few of these websites are load balanced. I use iptables: iptables -P OUTPUT ACCEPT ...
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1answer
77 views

ipt_CLUSTERIP: unknown protocol 1

I am trying to create a web cluster with two load balancers and a single public ip address The command I use is the following: iptables -I INPUT -d $CLUSTERIP -i $WAN_IF -j CLUSTERIP --new ...
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2answers
354 views

Squid load balancing and reverse proxy conflicts

I'm having difficulties configuring Squid 3.3 to do both "load-balancing" over multiple WAN links (using random ACLs + tcp_outgoing_address options) and to also have a "reverse proxy". It works just ...
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0answers
145 views

LVS + keepalived for load balancing transparent SQUID proxies

I need to load balance a number of SQUID proxies configured in transparent mode. Below is a simple diagram with one LB and SQUID boxes. ---------- | Client | ...
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1answer
162 views

Nginx add a response header that describe the upstream server used

I'm starting to use nginx with multiple backends by using the upstream directive. I want nginx to add a response header that describe which backend server was used to serve this request. Something ...
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1answer
37 views

Three ADSLs on a single router [duplicate]

I know that my question sounds impossible, but I would go deeper into it. I have three Internet connections: ADSL from Provider 1; ADSL from Provider 2; LTE from Provider 3 (USB WiFi Box). I need ...
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1answer
345 views

How to make connections answer from the same gateway they entered in RouterOS?

I have a MikroTik RouterOS 6.23 device, and my network is as follows: Router | |-- bridge1_LAN (wlan1 + ether1) (192.168.0.210) -- LAN (192.168.0.0/24) | Here is where computers are. Those ...
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0answers
125 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 ...
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0answers
84 views

Direct server return loadbalancer for mariadb galera cluster with 2 networks

Is it possible to configure LVS (keepalived) loadbalancer with direct server return (DSR) for 2 leg network setup? The desired architecture is as follows: mariadb galera cluster, where each node has ...
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1answer
156 views

Default backend in haproxy

I wonder whether there is a way to configure a default backend in haproxy, so it balances requests among a pool of backend servers (three in the example below), keeping the default backend as a ...
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2answers
2k views

How is a single IP address load balanced?

I'm aware of "round robin DNS" load balancing, but how can a single IP address be load balanced? Google's DNS servers for example, 8.8.8.8 and 8.8.4.4. Wikipedia's load balancing article states: ...
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1answer
158 views

How to AVOID getting caught in a DDOS meant for someone else (not prevent)?

So we have a load balancer and all that jazz set up with Rackspace. However, guess what, our clients' websites were down again today. It seems that Rackspace should have their load-balancer ...
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1answer
165 views

EC2 Failing Load Balancer Health Check

One of my projects is an internal web app which we are putting behind a load balancer. As of now there is only one ec2 (will be more in production) and the load balancer is not able to reach the ...
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0answers
59 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 ...
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2answers
172 views

Geographic load balancing

At a company they currently have a typical webserver setup: one webserver and one database server. Unfortunately there are often problems due to high load on the webserver and database so I was asked ...
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0answers
15 views

Simple way to test my load balancer from behind (inside) its LAN

I have a 3 DSL load balancer with, say, 1MB/seg download speed. In order to check its correct behavior from any of the computers connected to this load balancer and see if traffic (download, at least) ...
2
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1answer
384 views

How would you set up multiple SSL terminating Haproxy instances, which are themselves load balanced?

I've been doing a great deal of research and experimentation on this, and I'm really running into a wall: I'm trying to set up HAProxy as the reverse proxy for a high-availability environment. All ...
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1answer
40 views

What is the request flow in BIG-IP load balancers for NONE preference?

I would like to know to which member does the request will be first directed to when NONE preference is set in the BIG-IP load balancers. From this link, there are three ways to set the redundancy ...
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1answer
426 views

Load balancing iptables

I am trying to use iptable for load balancing. I'm working with virtualbox. All vm (debian)are in internal networking and IPs are static. I want to route requests coming to my web server(apache2) with ...
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1answer
54 views

Azure Traffic Manager TTL - what does it mean for downtime

The default TTL on Azure Traffic Manager is 5 minutes by default. Does this mean that when a server (endpoint) goes down then people won't get routed to a working server for up to 5 mins?
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1answer
284 views

Load balancing network traffic using iptables

I am trying to load balance traffic from internal LAN on a linux router having two gateways. Initially I went for the iproute implementation which didnt balance the load as expected, reason being that ...
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0answers
31 views

Load Balanced Apache [closed]

I am currently working on a POC solution where I would use a software load balancer to ensure HA for two Apache servers. Please pardon any mistakes because this is the first time I am playing around ...
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1answer
1k views

I can't upload server certificate on AWS IAM

I got AWS iam working on my server, and trying to upload some certificates: aws iam upload-server-certificate --server-certificate-name domain2014 --certificate-body ...
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2answers
719 views

RapidSSL: domain name does not match the certificate common name or SAN

I'm installing SSL certifcate (RapidSSL) on Amazon AWS (Load balancer). Installation was already completed, but when I test it I get: Wrong certificate installed. The domain name does not match the ...
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1answer
311 views

Apache presents wrong certificate when accessed via load balancer [duplicate]

I've got a server that has two SSL certificates set up, one for internal access where it is accessed along the lines of host.my-local.net and other for external access where it is accessed similar to ...
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2answers
411 views

Load balancing IPTABLES POSTROUTING rules

I have an interface with 5 IP addresses assigned to it (as virtual adapters) let's call them x1,x2,x3,x4 and x5. Currently I have SNAT POSTROUTING forwarding rules from local source range to specific ...
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1answer
396 views

NGINX ip_hash load balancing not working

I've set up NGINX to load-balance requests to my web app. One front end server passes requests to two backend servers. All works fine. However, I have been using the ip_hash directive to ensure users ...
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1answer
255 views

Clustered Apache 2.4 LoadBalancer displays no content on /balancer-manager

I have a Clustered Loadbalancer (pacemaker, corosync, apache 2.4) on CentOS 7. There are two configuration files, one for the actual balanced site and one for the balancer-manager. When I access the ...
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66 views

NGINX: Disk write spike and/or not enough workers error from sudden surge in traffic causing 500 errors

I have been trying to diagnose an issue we have on our production servers. We have a server running NGINX as a load balancer which splits requests between four application servers. At least a few ...