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Search results for How To Monitor A System With Sysstat On Centos 4.3

Debian

Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Keepalived On Debian Etch

Post date: October 29, 2007, 09:10 Category: Network Views: 5552 Comments
Tutorial quote: 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.).
Debian

Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Heartbeat On Debian Etch

Post date: November 7, 2007, 11:11 Category: Network Views: 5478 Comments
Tutorial quote: 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.).
Debian

Setting Up A Highly Available NFS Server

Post date: April 1, 2006, 05:04 Category: Network Views: 7001 Comments
Tutorial quote: In this tutorial I will describe how to set up a highly available NFS server that can be used as storage solution for other high-availability services like, for example, a cluster of web servers that are being loadbalanced. If you have a web server cluster with two or more nodes that serve the same web site(s), than these nodes must access the same pool of data so that every node serves the same data, no matter if the loadbalancer directs the user to node 1 or node n. This can be achieved with an NFS share on an NFS server that all web server nodes (the NFS clients) can access.

As we do not want the NFS server to become another "Single Point of Failure", we have to make it highly available. In fact, in this tutorial I will create two NFS servers that mirror their data to each other in realtime using DRBD and that monitor each other using heartbeat, and if one NFS server fails, the other takes over silently. To the outside (e.g. the web server nodes) these two NFS servers will appear as a single NFS server.

In this setup I will use Debian Sarge (3.1) for the two NFS servers as well as for the NFS client (which represents a node of the web server cluster).
Debian

Setting Up PHPlist (Open-Source Newsletter Manager)

Post date: May 27, 2008, 10:05 Category: Installing Views: 3878 Comments
Tutorial quote: This document describes how to set up PHPlist on Fedora, CentOS, Ubuntu and Debian. This howto should also work for other distributions with little modifications. Taken from the phplist page: "phplist is an open-source newsletter manager. phplist is free to download, install and use, and is easy to integrate with any website. phplist is downloaded more than 10 000 times per month and is listed in the top open source projects for vitality score on Freshmeat."
CentOS

Network Card Bonding On CentOS

Post date: July 5, 2007, 00:07 Category: Network Views: 6990 Comments
Tutorial quote: Bonding is the same as port trunking. In the following I will use the word bonding because practically we will bond interfaces as one. Bonding allows you to aggregate multiple ports into a single group, effectively combining the bandwidth into a single connection. Bonding also allows you to create multi-gigabit pipes to transport traffic through the highest traffic areas of your network. For example, you can aggregate three megabits ports into a three-megabits trunk port. That is equivalent with having one interface with three megabytes speed.
CentOS

Virtual Users & Domains With Postfix, Courier, MySQL & SquirrelMail (CentOS 4.8 i386)

Post date: October 8, 2009, 11:10 Category: Installing Views: 5159 Comments
Tutorial quote: This document describes how to install a Postfix mail server that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I'll also demonstrate the installation and configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier can authenticate against the same MySQL database used by Postfix.
CentOS

Virtual Users/Domains With Postfix, Courier, MySQL, SquirrelMail (CentOS 5.3)

Post date: May 14, 2009, 11:05 Category: Installing Views: 5281 Comments
Tutorial quote: This document describes how to install a Postfix mail server that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. I'll also demonstrate the installation and configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier can authenticate against the same MySQL database used by Postfix.
Solaris

How to Perform System Boot and Shutdown Procedures for Solaris 10

Post date: February 6, 2006, 07:02 Category: System Views: 12084 Comments
Tutorial quote: System startup requires an understanding of the hardware and the operating system functions that are required to bring the system to a running state. This chapter discusses the operations that the system must perform from the time you power on the system until you receive a system logon prompt. In addition, it covers the steps required to properly shut down a system. After reading this chapter, you’ll understand how to boot the system from the OpenBoot programmable read-only memory (PROM) and what operations must take place to start up the kernel and Unix system processes.
CentOS

How To Install Qmailtoaster (CentOS 5.3)

Post date: June 19, 2009, 10:06 Category: Installing Views: 8476 Comments
Tutorial quote: Qmailtoaster is a project that aims to make the installation of Qmail onto RPM based systems a snap. All of the packages are distributed in source RPMs so building the packages for your particular distro and architecture is as easy as running a script or a simple command for each package. The RPMs have all of the needed and commonly asked for patches included so you can have a mail server up and running in about an hour. When it's all complete, you'll have a full Qmail mail server installation ready for just about anything. I personally run Qmailtoaster servers for other companies and ISPs who have tens of thousands of users on their systems.
CentOS

How To Set Up MySQL Database Replication With SSL Encryption On CentOS 5.4

Post date: February 18, 2010, 13:02 Category: Miscellaneous Views: 5591 Comments
Tutorial quote: This tutorial describes how to set up database replication in MySQL using an SSL connection for encryption (to make it impossible for hackers to sniff out passwords and data transferred between the master and slave). MySQL replication allows you to have an exact copy of a database from a master server on another server (slave), and all updates to the database on the master server are immediately replicated to the database on the slave server so that both databases are in sync. This is not a backup policy because an accidentally issued DELETE command will also be carried out on the slave; but replication can help protect against hardware failures.
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