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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What product is AWS Elastic Laod Balancer behind the scenes

Does someone know what kind of product is working behind the scenes as AWS Elastic Loadbalancer? Could likely be something as haproxy, nginx, etc. Does someone know more respectively has any proof ...
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session management in loadbalancing

HTTP Session is stored in web container. Under a load balancer, multiple web containers works. How does session management works for a user? I think the following ways the session management works. ...
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34 views

Nginx Load Balancing proxy confusion

I'm currently trying to setup a load balancer for a bunch of download mirrors. While reading into this subject I saw Nginx lends itself perfectly as a load balancer, great! But when looking at the ...
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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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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 ...
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1answer
22 views

Apache SSL Errors every 30 seconds

I have three load-balanced Apache 2.4.6 servers running on fresh installs of CentOS 7. The load-balancer is a Barracuda 340. I know its old, but it's more than capable of handling the traffic, and ...
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133 views

How to make redundant load balancers?

I understand that the purpose of load balancers is to balance load between your servers and keep track of instance health, etc. But what if load balancer itself fails? How do you set up redundant load ...
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Redis high availability and load balancing

I'm using Redis for some time and now we want to move to a redundant cluster which would be fault tolerant, highly available and load balanced. I principally use Redis for some PHP web application ...
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41 views

Software load balancing - apache httpd or other

Figure 1: Web to Application Server - Load Balancing with Session Stickiness Figure 2: Target deployment - Software Load Balancer to route requests to app server through web server First picture ...
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Nginx ip_hash load balancer and external auth via SAML2

We are trying to make work a system, consisting of two application hosts and one nginx load balancer before them with ip_hash balancing method enabled. The problem is that we need to use an external ...
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1answer
12 views

Configure LVS Direct Routing on EC2 [closed]

Is it possible to set up LVS Direct Routing mode on EC2, which requires using Virtual IP. Is it correct to use Elastic IP as Virtual IP? Anything particular to set up to use Elastic IP as Virtual IP? ...
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19 views

ELB Https with HTTP on backend using Tomcat without nginx or haproxy

I want to setup ELB to terminate SSL at load balancer and communicate with backend instances over HTTP. I have uploaded valid certificate on ELB. When I set up following configuration ELB - HTTPS ...
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F5 Irule to Netscalar olicy

I am new to netscalar, Can someone tell me how to convert the below F5 irule to netscalar policy. F5 iRule: when HTTP_RESPONSE { if {[HTTP::cookie exists "e1AppState"]} { if {[HTTP::cookie ...
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Gracefully take a server out of Azure Load Balancer (drain stop)

We have an application deployed to Azure IaaS VMs, served by IIS. In order to install updates, we need to take each machine out of the load balancer, one by one. Before moving to Azure, we were using ...
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1answer
18 views

Haproxy dynamically promote backup server to master

Let's say if I have two mysql databases, db1 and db2. Is that possible to configure haproxy to work like that: In the beginning: db1 work as master and db2 as backup. The haproxy will promote db2 ...
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2answers
37 views

Setting up load balancing on 3 apache servers

I want to set up load balancing on my 3 Apache servers that I have created. The 3 addressed that I have used for the server are, 192.168.151.101, .102 and .103 I have then created a load balance ...
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3answers
48 views

Filter network traffic through 2 WANs depending on IP?

I've searched thoroughly in an attempt to find a similar question here, but aside from finding information about pfSense (which appears to only support 1 WAN?) I can't find much else... Our current ...
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0answers
20 views

using apache2 mod_proxy(_balancer) for 3+3 tomcat failover configuration

we have got 3 active Tomcat instances, the load should be distributed evenly amongst them (sticky sessions via jvmroute, ajp). We also have got 3 failover Tomcat instances running. If one of the 3 ...
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IPsec, PepVPN, SpeedFusion Hot Failover and SpeedFusion Bonding (PepLink Load balancer)

I was looking for the difference between IPsec, PepVPN, SpeedFusion Hot Failover and SpeedFusion Bonding (PepLink Load balancer) but i can't find something well explained. I'll be glad if someone can ...
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1answer
38 views

SAS balancing vs Network balancing

I want to configure file server in MS Windows Server 2012 R2 environment, which would load balance traffic. I have got a SAS disk array with 2 SAS controllers which is connected to 2 Hyper-V cluster ...
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63 views

How to load balance traffic from local Squid in pfsense when using Multi-WAN?

I have a multi-wan PFSense setup with Squid for HTTP(S) navigation. However one of the links (the default WAN gateways) is always used at 100% while the other link is rarely used. Reading the ...
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1answer
23 views

HAProxy - balance according to url_parameter

I have 2 different tomcat servers: T1 , T2 My clients that refer to my load balancer are providing the url parameter called "gender" (0 - for Male users , 1 - for Female users). only the url ...
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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 ...
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1answer
121 views

Network WAN load-balancing over Multiple Firewalls

Currently we have a Cisco ISA570 Firewall which does failover load-balancing between two ISP links. I would like to get a Sonicwall NSA6000 which should be primary and the ISA570 as a failover ...
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78 views

How to create an internal/private load balancer in google compute engine

I have two clusters. Cluster A (on google container engine) is a public facing cluster and it needs to connect to a private Cluster B (a click-to-deploy cluster on GCE) to access a service. I would ...
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37 views

Ipvsadm to monitor connections on a load balancer

I am working on to set up Haproxy on a load balancer with two backend web servers in the first period. The problem I am facing is to monitor number of connections to each of my web servers. I have ...
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nginx cache always returns MISS

I have 4 upstream server and I want to serve static files. I don't want to cache API calls response. This is what my upstream server returns for a sample CSS file: curl --verbose -X GET ...
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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; ...
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1answer
32 views

Benchmarking load balaners

I am working on to benchmark two different load balancers (pound and haproxy), but are unsure how this can be done. Of couse httperf can be used, but it may be technically difficult to actually make a ...
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appropriate traffic to load test couchdb horizontal scaling

I'm designing the CouchDB backend to my web application, and I want to estimate how many GETs and PUTs per second I can achieve with a given number of instances. (Arguably I should be testing view ...
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1answer
34 views

Layer 7 Load Balancing with on-premises exchange and Office 365

I would like to create essentially a layer 7 balanced redundant exchange setup where if the on-premises server fails it will automatically switch over to the office 365 Exchange services. I was ...
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25 views

Using a Load Balancer in front of SQL Server

We are setting up SQL Server 2014 AG with multiple secondary readonly instances since we have some significant queries that are killing our primary. What we would like to do is put a Load Balancer in ...
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28 views

MySQL Bad Handshake to MySQL Cluster behind Proxy

I have just set up a MySQL cluster using five hyperV linux boxes (2x management nodes, 2 data nodes and 1 proxy) having followed (with a bit of tweaking) the instructions here. Everything works fine ...
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Load Balanced - AutoScaled infrastructure AWS

I am currently setting up an environment in which we would like to have one server auto scaled and load balanced based on resource usage. I created the load balancer and have the instance running ...
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Bad Gateway - NGINX Load Balancer Cloudflare

I have configured an NGINX 'load-balancer' to sit in front of my site. Right now my backend consists of only one server, but I plan to add more to actually utilize the 'load-balancing' of NGINX. If I ...
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Load Balancing WAN1/WAN2 - Fortinet 100D

I have a FORTINET 100D, I don't understand how to set load balancing of two lines (WAN1-WAN2).. I would like that fortinet can manage requests (hotspot wifi) according to the load of a single WAN.. ...
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Exposing port 80 and 443 on Google kubernetes loadbalancer service

I followed the guestbook tutorial from Google and created my own configuration files from it. So farm everything is working fine. Now, I would like to expose the port 80 and 443 from my webserver ...
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Syncing Digital Ocean VPSs behing NGINX Load Balancer

This is a higher level, i.e. I just need avenues to explore here, question. I'm trying to set up an NGINX load balancer, behind which sit two different NGINX VPSs. Neither of the backends is a ...
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1answer
159 views

Why Failover instead of Load Balancing for HA

From my understanding with failover clustering, only one machine is actually working, which means the other one(s) are sitting idle. So why would one use failover clustering instead of using a load ...
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Load balancing and windows authentication

If I have a web service that is set up to use windows authentication, there will be a challenge response communication between the client and server (win 2008r2), as shown below. Ideally I would like ...
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web server to control 4 adsl lines? [closed]

Very new to this and been given a huge task....I've been asked to rebuild/redesign an existing network that has 4 ADSL lines, 3 servers (windows 2012 r2)- LAN, WEB, Database and 8 clients + switch, i ...
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42 views

Unable to start keepalived

I am trying to create load balancer using Virtual IP. I referred this link Load Balancer using Virtual IP. After configuring by mistake I started the backup server's keepalived service first and then ...
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75 views

Nginx Echo Subrequest not working

I am new to Nginx. My requirement is I need to make a service call but along with proxy passing that request, I need to make call to another service/servlet. For this I decided to use Echo module to ...
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50 views

How does load balancing work for a coreOS cluster?

Preface: I don't know much about load balancing. Say I have a few virtual machines on a cloud service like Amazon, running a few instances of coreOS each. How exactly does load balancing work in ...
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2answers
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Does Windows Network Load Balancing require any specific ports to be open?

I have two Windows 2012 servers, joined in a Windows Network Load Balancing cluster. I have been trying to find how the NLB heartbeat message is exchanged between those servers (to make sure it will ...
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47 views

Weird 502 responses of AWS ELB

My website suddenly failed to work this afternoon, responding every request with 502. I've set up 3 backend instances behind ELB, each with Nginx installed. At first, I suspected there's something ...
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F5 Load Balancing - axd files comes with 401 Unauthorized

I've got a problem I'm trying to resolve for some time. We have: 1 F5 Load Balancer 2 IIS servers with the same machine/validation keys behind the F5 LB Our problem is that our application hosted ...
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113 views

Common back pressure strategies for services under sustained high load

I'm wondering what are the common backpressure strategies people use for their web services? Imagine your service operates under heavy load, and at some point the load reaches 120% of your capacity. ...
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Run different instances behind one load balancer?

When using Amazon AWS is it possible to run different types of instances behind an load balancer? Let's say as base instance you have an t2.small and when having some more load you want an t2.micro ...
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One SSL certificate for load balancing amazon instances

As the title says I want to have one SSL certificate for multiple instances in amazon AWS. The multiple instances are connected to the internet through an load balancer. To make an SSL certificate and ...