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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Migrating from nginx to Amazon ELB

I'm interested in migrating from a manually managed AWS EC2 cloud with multiple webapps to AWS ELB with auto scalling. However, I'm not sure whether a single ELB will be enough to handle my ...
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10 views

Multiple webservers using PHP files stored on only one server?

Is it possible to have multiple webserver nodes that are balanced by a load balancer use PHP files stored elsewhere on the local network? Right now, I have two nodes and static content (uploads, file ...
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2answers
30 views

Creating a redundant environment with 2 servers [duplicate]

First of all, i'm sorry if this question has been answered before, but i've been searching for a while now and couldn't seem to find (or understand) an answer. So, i have two physical servers with ...
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21 views

IP Failover/Load Balancer [on hold]

I'm helping a friend move from go daddy to linode. This is what they told me how they have it setup. They have 2 lamp stack servers on linode. Both have mysql and apache running website. They have ...
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1answer
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Nginx load balancer shows wrong site on failover server

I have five websites and I have three servers, all running nginx. Primary server Load balancer Failover server Each website has it's own primary server but they all share the same failover ...
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Lot of Haproxy Frontend Request Errors

I have a haproxy setup with two backends. The backends are pure pub sub streaming servers using websockets with fallback to plain http for older browsers. I am seeing 4-5% of all requests on the ...
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23 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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25 views

Server becomes unresponsive while under load

We have a server setup containing 2 webservers, a RDS MySQL cluster and a loadbalancer, on AWS. The webservers are running PHP and Nginx, and contains multiple services each. We have a service ...
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3answers
2k views

How do big companies like Youtube load balances traffic with only one IP [duplicate]

Examining the A records for youtube.com (for example), I see only one IP address. How can this be possible, given the volume of traffic they handle? Do they use anycast with load balancers behind ...
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1answer
22 views

HAProxy “option redispatch” not working when I put into maintenance mode

I'm having an issue with HAProxy not redispatching connections to servers. When I put a server into maintenance mode none of the active connections are being disconnected/transferred to other active ...
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2answers
39 views

HAProxy - Health check of multiple microservices for one server

We have 2 web servers that we want to load balance. Each server has a main web application that is hit by the public. Each server also has number of dependent microservices that are used internally by ...
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2answers
27 views

HAProxy mysql configuration

I tried few times, but I cannot figure it out why my mariadb load balancer with haproxy is not working. I have : 1 HAProxy (CentOS) : 10.181.102.249 1 Master (CentOS) : 10.183.241.150 2 Slaves ...
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1answer
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when to use NFS for web app

I am currently building a simple webapp architecture on AWS, as follow: Elastic Load Balancer - multiple front ends - RDS database. I have also set up an NFS server to store all images uploaded by ...
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2answers
44 views

IIS Load Balance with 2 servers

I have two servers that I would like to use to load balance an application. Ideally, but not a requirement, I could load balance based on URL. But based on my research, that is not something that is ...
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1answer
15 views

Nginx Load Balance / Proxy to Upstream with Path / Rewrite

Basically I have a API farm as 192.168.1.1, 192.168.1.2, 192.168.1.3 However the endpoints have different folder structure (3rd parties which i can't amend!) So basically I want to have a nginx ...
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0answers
17 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 ...
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0answers
86 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. ...
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1answer
20 views

HA Proxy should continue with backup till all sessions are alive when main server up

I have two servers say MainServer and BackupServer. From this MainServer is main server and BackupServer is my backup sever which I have configured with HA Proxy. Here is my HA configuration server ...
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1answer
33 views

Can apache proxy/load balancer redirect requests to other available balancer member when it gets timeout from a hanging server?

I am using apache2.4.6 and tomcat8 to implement a load balance solution. I'd like to know whether apache balancer will redirect requests to another balancer member if it gets timeout error from one ...
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1answer
22 views

Why hostname got truncated from the HAProxy syslog messages

This is a slice from my haproxy logging, where I target the sysloga and remotely log to papertrail, using the log-send-hostname option to pront the hostname in the log message instead of the ...
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3answers
88 views

load balance across several SSDs in a server

I would like to have a volume spanning several SSDs or HDDs in my server. When I write a file to this volume, the file is written in whole to one of those drives chosen randomly or in round robin ...
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1answer
42 views

Nginx load balancer returns bad gateway error

I have three servers; two web servers running nginx and a load balancer also running nginx. I can ping/telnet/curl between the load balancer and web servers but when I try to go to the load balancer ...
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99 views

Transparent Proxy Issues w/ HAProxy Centos 7

Having issues following steps to transparent proxy outlined here: Howto transparent proxying and binding with HAProxy and ALOHA Load-Balancer | HAProxy Technologies – Aloha Load Balancer Believe to ...
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1answer
25 views

Load Balance Virtual Host and Amazon/DO Server using HAProxy

I am stuck with an issue and im hoping someone can point me in the right direction. I have a server that hosts multiple sites using Apache Virtual hosts (shared IP's). A few months ago my server ...
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14 views

Sonicwall NSA240 - Route all traffic from one WAN connection direct to VLAN

We are wanting to setup a Sonicwall NSA 240 as a PPPoE 'gateway' for several internet connections, each of these internet connections need to be put onto a separate VLAN. This will then be sent via ...
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1answer
51 views

How do load balance servers handle all the traffic? [closed]

I'm trying to understand how load balancing works. I have read the basics however I don't understand how a load balancer doesn't go down because of all the traffic. Lets say I have 1 load balance ...
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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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1answer
11 views

ldirectord balancing internal traffic doesnt work

Here is my ldirectord.cf file checktimeout=10 checkinterval=2 autoreload=no logfile="local0" quiescent=yes virtual=192.168.1.4:7777 real=192.168.1.52:7777 gate scheduler=wlc ...
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2answers
27 views

SSL Cert for one domain and multiple IPs

I have a question about SSL certs and multiple servers. Question: I have one cert, one domain name and I have many servers that hold my website code. Example.com can point to IPs 192.168.1.1, ...
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local port forwarding with failover

There is a number of similar though not identical processes (worker processes) running on the localhost and listening each on its own TCP port, let's say process1 is listening on port 10001 process2 ...
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2answers
26 views

unison or Rsync for session files

In my cheap config I am using 2x app servers and 1x DB server. My question now is what I should use in order to sync session files between the servers for my php app? Is unison or Rsync good here, ...
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1answer
61 views

Two network adapters for a machine to double the transfer speed [closed]

i am new to this. In my scenario, i have a desktop pc running windows 7 and planning to set up a local web server using xampp for big file transfer in the lab. The problem is that,there are 80 ...
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2answers
47 views

Elastic Load Balancer awseb-e-g has zero healthy instances

I have an Elastic Beanstalk (EB) set up with a running application on a PHP/Apache server. The application was running OK since many hours ago when the EB's health got subtly RED and I don't know why. ...
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1answer
60 views

Nginx multi website multi public ip

I have deployed platform with archetecture where I have nginx lb server hash, behind is app server that has 4 apps. nginx lb server has configurations such as: upstream example1.com { ip_hash; ...
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0answers
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On a low-level, what is happening when a database server with no connection limit gets “overloaded”?

I'm making my first foray into scaling web architecture, and I was trying to find some more technical literature on what exactly happens that causes a database server to crash. Theoretically, it ...
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28 views

Load Balancer Loop Through

I have a Cisco ASA which is currently load balancing a number of web applications. We are preparing to bring a new application online that is an API that is going to be referenced by one or more of ...
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can AWS load balancer auto restart out of service images?

I have set up a load balancer with two instances in two availability zone I set up an health check to ping a specific page of my webapp now I'm trying to find if the load balancer health check could ...
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2answers
23 views

ipvsadm: Access loadbalanced ip's from internal network

I have the following scenario: ipvs-Loadbalancer - direct routing: 123.123.123.117 Realserver 1: eth0: 123.123.123.123 eth1: 10.10.0.1 Realserver 2: eth0: 123.123.123.124 eth1: 10.10.0.2 Random ...
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1answer
33 views

ELB health checks for freshly launched EC2 instances not working

I'm trying to manually set up a load balanced environment using EC2. My instances are reachable via SSH and ping. However, as soon as I put them inside a load balancer, the instances are not able to ...
2
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3answers
381 views

Using Multiple Load Balancers

I'm new to load balancing and I'm wondering if it's possible to use multiple load balancers to redirect traffic to my application servers. I don't really understand how this can be done. Shouldn't a ...
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0answers
53 views

How to fix the amount of bandwidth of iperf in tcp mode?

I'm working on some experiments about my master's degree project. I'm studying some load-balancers (I'm not supposed to cite them here) and the aim is to get for each bandwidth the cpu % usage of a ...
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2answers
43 views

How to replicate application in load balanced infrastructure

AWS use AMI (Amazon Machine Image) to copy the application server whenever new node (server) is deployed. How that work ? What sort of image is that ? What are other ways to do replication of ...
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35 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 ...
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1answer
24 views

ARR Load Balance with two Machines - Always redirect to same Site

described steps for each setup. Created a sample Application WebShareTest , hosted the application in M1(IP 36) on port (80) and same Binary I hosted in M2(IP 210) (on port 8070) I pointed some ...
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1answer
27 views

Keep connections of closed instances behind a load balancer

I'm looking for a system to create a live sockets application through sockets.io and that can be balanced without problem. There are tons of solutions to balance the load between multiple socket ...
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1answer
30 views

ESXI 5.1 not balancing CPU load across all cores/threads

I have 2x servers with 2x E5645 (6c/12t). I am running own software which is processing millions of entries from database (database holds compressed big chunk of data in each row, software is ...
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88 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 ...
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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 ...
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1answer
68 views

RTMP load-balancing via HAProxy

I've got a little problem to solve: I need to find a way to load balance, bandwidth-wise, the incoming RTMP streams on my servers. I have 2 RTMP servers (nginx-rtmp), let's call them S1 and S2. The ...
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53 views

DNS Based Load balancing on squid - odd issues

I'm attempting to do round-robin DNS based load balancing for two squid boxes running as simple HTTP(S) proxies. For testing I'm using AWS Route 53. To simulate round-robin I created two records ...