"The main goal of the keepalived project is to add a strong & robust keepalive facility to the Linux Virtual Server project. This project is written in C with multilayer TCP/IP stack checks. Keepalived implements a framework based on three family checks : Layer3, Layer4 & Layer5. This framework gives the daemon the ability of checking a LVS server pool states. When one of the server of the LVS server pool is down, keepalived informs the linux kernel via a setsockopt call to remove this server entrie from the LVS topology. In addition keepalived implements a VRRPv2 stack to handle director failover. So in short keepalived is a userspace daemon for LVS cluster nodes healthchecks and LVS directors failover.
Failover and loadbalancer using keepalived (LVS) on two machines
January 26th, 2009
In this scenario, we have two machines and try to make the most of available resources. Each of the node will play the role of realserver, it will provide a service such as a web or a mail server. At the same time, one of the machines will loadbalance the requests to itself and to its neighbor. The node that is responsible of the loadbalancing owns the VIP. Every client connects to it transparently thanks to the VIP. The other node is also able to take over the VIP if it detects that current master failed but in nominal case only process requests forwarded by the loadbalancer.
Regular expressions (or regex) are a powerful way to traverse large strings in order to find information. They rely on underlying patterns in a string’s structure to work their magic. Unfortunately, simple regular expressions are unable to cope with complex patterns and symbols. To deal with this dilemma, you can use advanced regular expressions.
This guide describes how you can automatically scan files uploaded by users through a web form on your server using PHP and ClamAV. That way you can make sure that your upload form will not be abused to distribute malware. To glue PHP and ClamAV, we install the package php5-clamavlib/php4-clamavlib which is rather undocumented at this time. That package is available for Debian Etch and Sid and also for Ubuntu Dapper Drake and Edgy Eft, so make sure you use one of these platforms.
This tutorial will guide you through the process of migrating ejabberd from one host to another. Maybe it isn't needed to convert the Mnesia backup file, as mentioned here: Document how to change computer hostname.
Because ejabberd uses Mnesia as its internal database, and because this system stores the Erlang node name into the backup files, when you want to migrate from one host to another you have to 'convert' the backups from the old node name to the new one.
Tips on using the rsync command. rsync performs incremental filesystem transfers, allowing filesystem duplication or snap shots. Alternatives to rsync on Unix systems include cp -r, pipes between tar commands, or unison.