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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1answer
15 views

How do load balance servers handle all the traffic?

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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6 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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1answer
6 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
25 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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0answers
10 views

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 ...
0
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1answer
49 views

Hosting a multi-national website from multiple geographic locations? [on hold]

I have a large project to build a multi-national corporate website on a CMS. All content needs to be managed from a single central CMS instance. The site will have multiple regional domains (.com, ...
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2answers
20 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
50 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 ...
0
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2answers
21 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. ...
0
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1answer
47 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; ...
0
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0answers
10 views

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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0answers
26 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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0answers
24 views

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 ...
0
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2answers
21 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 ...
0
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1answer
19 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
348 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 ...
0
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0answers
40 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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0answers
27 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 ...
0
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1answer
12 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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0answers
58 views

Auto Scale python spider running on Amazon EC2

I have Python crawler written in Scrapy framework. I have simple dashboard from where i can create new projects. Each project create new spider. Web dashboard and crawler is in separate instances. I ...
0
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1answer
25 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
26 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 ...
0
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0answers
60 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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0answers
83 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 ...
0
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1answer
45 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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0answers
45 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 ...
3
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1answer
70 views

How does nginx distribute traffic among IPs associated with an upstream DNS name?

With this configuration: upstream some_upstream { server some-elb.us-east-1.elb.amazonaws.com:80; } If some-elb.us-east-1.elb.amazonaws.com maps to 2 IP addresses, how will nginx distribute ...
0
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1answer
36 views

How to do load balancing with nginx

I need to use server as load balancer and web server at the same time. Here is my nginx config for website: upstream load_balancer { least_conn; server localhost; #server ...
0
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1answer
50 views

HAProxy parsing errors

i have 3 servers --> haproxy - server1(uk) - server2(ru) i followed this tutorial and created ip for ru.subnets now in my /etc/haproxy i have these files: haproxy.conf ru.subnets ...
2
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1answer
75 views

HAproxy mysql failover

I try to set up a HA cluster with Percona xtraDB Cluster for MySQL replication and HAproxy for load balancing. HAproxy works really good with apache, when apache crash or if it's not responding, ...
0
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1answer
29 views

Azure, internet facing load balancer without using cloud services

Is it possible to have load balancing between virtual machines without placing the machines in the same cloud service? We want to use Ansible to configure our machines and setup RabbitMQ but I can't ...
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2answers
59 views

How do you Mask URLs in HAProxy?

Is there any way to do URL masking in HAProxy? I'd like to have a URL directing to my load balancer, i.e. www.example.com, redirect to another URL I have for another application. However, I'd like the ...
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0answers
26 views

Azureloadbalancer v2 does not balances traffic

I am trying to use new Azure feature - Loadbalancer v2 with Virtual Machines v2 due to very easy and templatable provisioning. However, load balancer does not allow traffic on port 80 to my machines. ...
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0answers
23 views

Correct way to load balance a node app in opsworks

I have an Opsworks stack with 2 different node apps running in the same layer. One of these apps needs to be load balanced as it will be accessed by the general public, but the other is only accessed ...
0
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1answer
60 views

Nginx upstream fails over from serverA to serverB, and then back to serverA, why?

Background I have the following Nginx configuration which is load balancing 2 Tomcat servers running on 2 different servers: ### http://nginx.org/en/docs/http/ngx_http_upstream_module.html#hash ...
0
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1answer
65 views

Internal Failover Load Balancing in Azure

I have a MongoDB Cluster deployed in Azure. Normally a MongoDB cluster has at least a couple of mongo router instances (mongos) which is where an application should connect (the application is also ...
0
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0answers
41 views

Mapping uWSGI processes to specific cpu cores

I have 2 sites on my server (debian) with 4 cpu cores. For both of them I use workers=2 and cpu-affinity=1 so workers are mapped to cpu 0 and 1 for both sites like that: spawned uWSGI master process ...
0
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1answer
60 views

What is Refs column on varnishadm backend.list command?

Below is a command output example: varnish> backend.list 200 Backend name Refs Admin Probe webserver01(172.31.30.167,,80) 7 probe Healthy 6/6 ...
0
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1answer
26 views

Wordpress on stage environment with SVN

Currently we have this configuration for our website: Stage environment. On this environment we use a connection to live DB and for code we use SVN. Production/Live environment. Load Balancing ...
1
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0answers
66 views

nginx load-balance set weight and ip_hash at the same time

By default the Nginx upstream directive uses Round-Robin to distribute requests to backend realsevers and set the weight of the server by weight. But I do not see any words about whether weight works ...
0
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0answers
64 views

Error 499: Varnish is working how load balance Nginx Webservers

I created a solution to host a magento store with high traffic (> 500 user simultaneously) on AWS. Too often HTTP 499 error appears in the access.log the Varnish. When this happens users who have such ...
0
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0answers
36 views

Automatically upgrade virtual machine in load balanced set on Windows Azure

I have been serving web content off of a Linux VM running in Windows Azure, and now want to make a duplicate virtual machine and create a load-balanced set to handle more load and avoid downtime. I've ...
0
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0answers
23 views

Unable to understand site structure in server

I am working with an Apache load balancer and two tomcat servers. When i was adding a new site.conf to /etc/apache2/sites-available I noticed some discrepancies in the server name and server alias of ...
0
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0answers
40 views

How to check if connection is working before load balancer decides which server to use

I am working on a project whereby we deliver a secure site for our customers. We host the sites on two servers behind a load balancer but have port connections (24000-24100) to each database. The ...
1
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1answer
105 views

Application Fail over not working in apache 2.2 web server configured with BIG IP (f5) load balancer

I am using Apache 2.2 in front of my JBOSS 5.2 application server in a cluster configuration . The two nodes of the cluster configuration resides on different host . This configuration is hosted on ...
2
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1answer
62 views

Load Balancing between 2 ISPs

I'm having 2 ISPs, need to balance traffic between the internal users ... Firewall is SRX210 The question is: Each ISP has there own DNS, how to make the dns resolving based on the used ISP? ...
1
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1answer
136 views

Is having the same PTR hostname valid for multiple ip addresses? [duplicate]

Currently I have the following setup with two hostnames and two ips: cheeze1.mydomain.com IN A 123.123.123.111 111.123.123.123.in-addr.arpa IN PTR cheeze1.mydomain.com cheeze2.mydomain.com ...
0
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1answer
69 views

Single Nginx Load Balancer for 2 different clusters (web, api)

I was wondering if it was possible to use a single Nginx server to load balance my web servers and api servers if both are using port 80. In this setup there would be 5 servers, 1 Nginx and 4 Apache ...
0
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1answer
177 views

Moving a web application to use HAProxy, Varnish, and nginx

I currently have 4 web application servers (running on application) on Rackspace that sit behind a Load Balancer (on Rackspace). In front of the Load Balancer. The application itself makes moderate ...