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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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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1answer
61 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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1answer
177 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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1answer
37 views

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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143 views

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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1answer
1k views

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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1answer
97 views

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 ...
2
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1answer
244 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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30 views

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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350 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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266 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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1answer
258 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
225 views

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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237 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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0answers
137 views

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 ...
4
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1answer
373 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. ...
3
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1answer
123 views

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 ...
1
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1answer
53 views

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 ...
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2answers
2k views

Remote Desktop Server farm stops working

A previously nicely functioning Remote Desktop Server Farm ahs stopped working two days ago. The setup is as follows: DNS resolves "myfarm.mydomain.local" to the IPs of all the farm member servers ...
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108 views

pfSense WAN load balancing across two IPs (has single gateway)

My virtual setup has two IPs, but they rely on the same gateway. I had this configured: interface - type - IP address - Gateway em0 - WAN1 - 172.16.155.131 - 172.16.155.2 em1 - LAN ...
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1answer
109 views

Deploy multiple Web services versions at same domain

I would like to have all my Web services versions deployed at the same domain, like this: rest.mydomain.com/v1/ rest.mydomain.com/v2/ ... But these different versions are in different servers. ...
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1answer
416 views

HAProxy loadbalancing wildcards

This is an example of my loadbalancer file for a single DNS entry. acl: - 'is_site_net hdr(host) -i site.net’ use_backend: - 'site_net if is_site.net whitelist_list’ site_net: options: ...
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1answer
216 views

How to health check hosts over HTTPS behind the load-balancer?

I have NGINX serving my site over HTTPS on EC2 hosts behind Elastic Load Balancer. I need to set up a proper health-check in ELB. However, I cannot use https://www.example.com because I need to ...
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225 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 ...
5
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1answer
2k views

Nginx as a load balancer. Frequent upstream timed out (110: Connection timed out) while connecting to upstream

I'm trying to use nginx on a centos 7 virtual machine as a load balancer to replace an aging Coyote Point hardware device. However in one of our webapps we're seeing frequent and continual upstream ...
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1answer
32 views

Load balance prevent from seeing email

Some of our email are hosted with Network Solution, Yesterday we setup load balance on our WAN connection. Since we did it, our user cant log on to their web mail interface. Each time they try to log ...
2
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1answer
150 views

NGINX load balancing not working as expected

I have an ubuntu system working as a load balancer and the /etc/nginx/sites-available/default looks like this: http { upstream myapp1 { server 192.168.0.20:80; } server { ...
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1answer
84 views

AWS ELB 400 BAD_REQUEST with space at the end of a URI

We're using AWS ELB for HTTP/S load balancing, and we've run into a pretty crazy issue with the ELB. $ curl -i "http://yourdomain.com/ " HTTP/1.1 400 BAD_REQUEST Content-Length: 0 Connection: Close ...
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225 views

Simulate load balancing on localhost using IIS and Application Request Routing

I want to simulate website load balancing on my development machine using IIS and Application Request Routing. I was able to "load balance" between two external sites, but trying to do the same with ...
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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 ...
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2answers
33 views

NGINX with “serverpool” as the LB for DIFFERENT DOMAINS on same Apache Servers?

I have nginx as a LB. And the 2 Apaches as the web servers. Lets say i got different domains: www.example.com checkout.example.com Both domains will be in same 2 Apache Servers. But ofcoz under ...
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0answers
127 views

How haproxy understand URLs, URI, HOSTs

I know that haproxy understand urls, but here when I want to test if haproxy is up I acess the machine name at browser and it redirects to the desired node.js server. This request is usually a ...
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192 views

Elastic Load Balancer connection draining causes a blank page for some web sessions

I'm running 3 EC2 instances behind an ELB with connection draining enabled (set to 300ms). When I remove an instance from it, I can see fewer and fewer web requests in the server log until eventually ...
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1answer
2k views

HAProxy + keepalived + multiple backend farms / virtual IP addresses

we have several backend farms (HTTP, FTP, etc), basically one farm for each customer, and I am about to rebuild our load balancing infrastructure, moving from Piranha to HAProxy. Since we are using ...
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0answers
409 views

HAProxy tcp load balancing with an https check fails

I'm trying to load balance a posgres tcp connection, with a node check done via a python script residing on an https connection. conf file looks like so: global log 127.0.0.1 local2 ...
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2answers
94 views

Can a Varnish director be queried for the number of healthy backends it contains?

Specifically in Varnish 3, is there a way to check if a director has any healthy backends? My use case is that I have a load balancer that is distributing traffic to 2 varnish boxes, which in turn ...
7
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0answers
418 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 ...
1
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1answer
276 views

Active/Passive Reverse Proxy with nginx

I have two Websocket servers which working with Zookeeper & Curator as Active/Passive, if one server fails then second backend comes alive. I configured it the following way: upstream backend { ...
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0answers
74 views

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 ...
5
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2answers
4k 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 / ...
0
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2answers
544 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 ...
1
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1answer
70 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
233 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 ...
3
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1answer
1k 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
155 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
173 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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2answers
1k 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
138 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 - ...
7
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2answers
797 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 ...
0
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3answers
649 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 ...