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How To Set Up A Loadbalanced High-Availability Apache Cluster On Ubuntu 8.04 LTS

06/13/2008  
Relevance: 8.37
This tutorial shows how to set up a two-node Apache web server cluster that provides high-availability. In front of the Apache cluster we create a load balancer that splits up incoming requests between the two Apache nodes. Because we do not want the load balancer to become another"Single Point Of Failure", we must provide high-availability for the load balancer, too. Therefore our load balancer will in fact consist out of two load balancer nodes that monitor each other using heartbeat, and if one load balancer fails, the other takes over silently.
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Setting Up A High-Availability Load Balancer With HAProxy/Heartbeat On Fedora 8

03/02/2008  
Relevance: 7.58
This document describes how to set up a two-node load balancer in an active/passive configuration with HAProxy and heartbeat on Fedora 8. The load balancer acts between the user and two (or more) Apache web servers that hold the same content. The load balancer passes the requests to the web servers and it also checks their health. If one of them is down, all requests will automatically be redirected to the remaining web server(s). In addition to that, the two load balancer nodes monitor each other using heartbeat. If the master fails, the slave becomes the master - users will not notice any disruption of the service. HAProxy is session-aware - you can use it with any web application that makes use of sessions like forums, shopping carts, etc.
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Using free software for HTTP load testing

08/12/2008  
Relevance: 7.52
A good way to see how your Web applications and server will behave under high load is by testing them with a simulated load. We tested several free software tools that do such testing to see which work best for what kinds of sites. If you leave out the load-testing packages that are no longer maintained, non-free, or fail the installation process in some obscure way, you are left with five candidates: curl-loader, httperf, Siege, Tsung, and Apache JMeter. Daniel Rubio already covered JMeter in detail, so I will not go into it again here, but I will compare it to the others in the final evaluation at the end of the article.
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Linux: Understanding the Completely Fair Scheduler

05/15/2007  
Relevance: 7.08
"As I understand, fair_clock is a monotonously increasing clock which advances at a pace inversely proportional to the load on the run queue," Srivatsa Vaddagiri explained in a review of Ingo Molnar's CFS CPU scheduler,"if load = 1 (task), it will advance at same pace as wall clock, as load increases it advances slower than wall clock."
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Server load, and keyboards

03/13/2008  
Relevance: 6.92
I have a server (LDAP and NFS) which occasionally seems to take a while to react. Load average is consistently high (10-12 for 4 CPUs, which AIUI means 2.5-3 per CPU); response may also be being affected by disk I/O.
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Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Heartbeat On Debian Etch

11/08/2007  
Relevance: 6.89
This article explains how to set up a two-node load balancer in an active/passive configuration with HAProxy and heartbeat on Debian Etch. The load balancer sits between the user and two (or more) backend Apache web servers that hold the same content. Not only does the load balancer distribute the requests to the two backend Apache servers, it also checks the health of the backend servers. If one of them is down, all requests will automatically be redirected to the remaining backend server. In addition to that, the two load balancer nodes monitor each other using heartbeat, and if the master fails, the slave becomes the master, which means the users will not notice any disruption of the service. HAProxy is session-aware, which means you can use it with any web application that makes use of sessions (such as forums, shopping carts, etc.).
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Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Keepalived On Debian Etch

10/29/2007  
Relevance: 6.89
This article explains how to set up a two-node load balancer in an active/passive configuration with HAProxy and keepalived on Debian Etch. The load balancer sits between the user and two (or more) backend Apache web servers that hold the same content. Not only does the load balancer distribute the requests to the two backend Apache servers, it also checks the health of the backend servers. If one of them is down, all requests will automatically be redirected to the remaining backend server. In addition to that, the two load balancer nodes monitor each other using keepalived, and if the master fails, the slave becomes the master, which means the users will not notice any disruption of the service. HAProxy is session-aware, which means you can use it with any web application that makes use of sessions (such as forums, shopping carts, etc.).
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High-Availability Load Balancer With HAProxy/Wackamole/Spread On Debian Etch

01/06/2009  
Relevance: 6.89
This article explains how to set up a two-node load balancer in an active/passive configuration with HAProxy, Wackamole, and Spread on Debian Etch. The load balancer sits between the user and two (or more) backend Apache web servers that hold the same content. Not only does the load balancer distribute the requests to the two backend Apache servers, it also checks the health of the backend servers. If one of them is down, all requests will automatically be redirected to the remaining backend server. In addition to that, the two load balancer nodes monitor each other using Wackamole and Spread, and if the master fails, the slave becomes the master, which means the users will not notice any disruption of the service. HAProxy is session-aware, which means you can use it with any web application that makes use of sessions (such as forums, shopping carts, etc.).
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Postfix Stress Test with smtp-source and top

09/29/2008  
Relevance: 6.61
When building a mail server, one of the difficult choices is how big to build it. This tutorial is one way to test the load on a server to determine what it can handle. In order to evaluate the load on your mail server you can run smtp-source and combine that with snapshots of top to evaluate the load and I/O. Open two terminals and in one run the smtp-source command and in the other snapshots for top.
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Load-Balanced High-Availability Web Cluster With 2 Xen Servers On Ubuntu 8.04

10/12/2008  
Relevance: 6.54
In this howto we will build a load-balanced and high-availability web cluster on 2 real servers with Xen, hearbeat and ldirectord. The cluster will do http, mail, DNS, MySQL database and will be completely monitored. This is currently used on a production server with a couple of websites. The goal of this tutorial is to achieve load balancing& high availability with as few real servers as possible and of course, with open-source software. More servers means more hardware& hosting cost.
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Showing 10 articles of total 23433 in database ( English).

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