falko's blog

Vodafone Mobile Connect Card driver for Linux is a tool that allows you to establish a connection to the Internet using 3G cards. It also allows to send and receive short messages from your computer. The cards currently supported are: Huawei E620, Huawei E220 and Option GlobeTrotter 3G+ EMEA. http://www.howtoforge.com/vodafone_mobile_connect_card_driver_linux

This guide shows how you can upgrade your desktop from Ubuntu 7.04 (Feisty Fawn) to Ubuntu 7.10 (Gutsy Gibbon). http://www.howtoforge.com/upgrading_ubuntu_7.04_to_7.10

This guide describes how to set up a full email solution in Debian Linux (all code is from Debian Etch). I was asked to design a secure, scalable, portable solution for a small company. While the guide references many servers, the company only had 4 physical machines, Xen was used to virtualize the entire solution. That particular aspect of the system is not discussed in this guide, although I will try to get it into the next revision. http://www.howtoforge.com/postfix_mysql_dovecot_dspam_clamav_postgrey_rbl_debian_etch

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.).

Since version 5, MySQL comes with built-in support for master-master replication, solving the problem that can happen with self-generated keys. In former MySQL versions, the problem with master-master replication was that conflicts arose immediately if node A and node B both inserted an auto-incrementing key on the same table. The advantages of master-master replication over the traditional master-slave replication are that you do not have to modify your applications to make write accesses only to the master, and that it is easier to provide high-availability because if the master fails, you still have the other master. http://www.howtoforge.com/mysql5_master_master_replication_debian_etch

This tutorial shows how to set up an Ubuntu Gutsy Gibbon (Ubuntu 7.10) based server that offers all services needed by ISPs and hosters: Apache web server (SSL-capable), Postfix mail server with SMTP-AUTH and TLS, BIND DNS server, Proftpd FTP server, MySQL server, Courier POP3/IMAP, Quota, Firewall, etc. This tutorial is written for the 32-bit version of Ubuntu Gutsy Gibbon, but should apply to the 64-bit version with very little modifications as well. http://www.howtoforge.com/perfect_server_ubuntu7.10

Imagine you have a machine with all of its disk full and another with unused gigabytes, and you do not want to move the data from one to the other. Why not use the second's disk on the first, you could do it with iSCSI, but you can do it with ATA over Ethernet (AoE) as well. It is the second method I will explain in this article. All of this was made with two computers running Debian Etch. http://www.howtoforge.com/ata_over_ethernet_debian_etch