Linux

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How to Avoid Being Blacklisted

How to Avoid Being Blacklisted

A blacklist usually refers to a list of e-mail or IP addresses known to send spam e-mails or some other type of unsolicited messages. Such lists are currently used by mail servers for filtering incoming e-mails and blocking the ones listed, in order to improve mail security and integrity. The blacklist is also the opposite of what is called a whitelist.

QoS And Traffic Shaping For VoIP Users Using iproute2 And Asterisk

QoS And Traffic Shaping For VoIP Users Using iproute2 And Asterisk

The quality of my VoIP phone calls suffered whenever I was downloading or uploading anything. This was irritating, especially for those calling me (I heard them better than they heard me). So I poked at Iproute2 and other howtos, especially with regard to VoIP traffic, but I couldn't find anything that worked well. After some playing around, I've found settings that were right for me: consistant VoIP quality, regardless of any activities on the wire.

Lintrack As A LAN Gateway And An OpenVPN Bridge

Lintrack As A LAN Gateway And An OpenVPN Bridge

This tutorial will guide you through installation and configuration of Lintrack, a GNU/Linux distribution specialized in networking tasks. We will give two LANs access to the internet along with DHCP and DNS cache servers, and then we will connect our networks using OpenVPN in bridging mode. You should be running all these in well under an hour, thanks to the unified configuration interface of Lintrack.

How To Utilize Your New Multimedia Keyboard Under Linux

How To Utilize Your New Multimedia Keyboard Under Linux

Xbindkeys is a program that allows you to launch shell commands with your keyboard or your mouse under X Window. It links commands to keys or mouse buttons, using its configuration file. It does not depend on the window manager and can capture all keyboard keys.

Recover Data From RAID1 LVM Partitions With Knoppix Linux LiveCD

Recover Data From RAID1 LVM Partitions With Knoppix Linux LiveCD

This tutorial describes how to rescue data from a single hard disk that was part of a LVM2 RAID1 setup like it is created by e.g the Fedora Core installer. Why is it so problematic to recover the data? Every single hard disk that formerly was a part of a LVM RAID1 setup contains all data that was stored in the RAID, but the hard disk cannot simply be mounted. First, a RAID setup must be configured for the partition(s) and then LVM must be set up to use this (these) RAID partition(s) before you will be able to mount it. I will use the Knoppix Linux LiveCD to do the data recovery.

Back Up (And Restore) LVM Partitions With LVM Snapshots

Back Up (And Restore) LVM Partitions With LVM Snapshots

This tutorial shows how you can create backups of LVM partitions with an LVM feature called LVM snapshots. An LVM snapshot is an exact copy of an LVM partition that has all the data from the LVM volume from the time the snapshot was created. The big advantage of LVM snapshots is that they can be used to greatly reduce the amount of time that your services/databases are down during backups because a snapshot is usually created in fractions of a second. After the snapshot has been created, you can back up the snapshot while your services and databases are in normal operation.

How to configure your SCSI or USB scanner to work with SANE/XSANE from your regular user account

How to configure your SCSI or USB scanner to work with SANE/XSANE from your regular user account

This article shows how you can make your scanner (SCSI or USB) work with SANE/XSANE from a normal user account without getting permission errors.

Useful Commands For The Linux Command Line

Useful Commands For The Linux Command Line

This short guide shows some important commands for your daily work on the Linux command line.

Setting the SUID/SGID bits: Giving a program YOUR permissions when it runs

Setting the SUID/SGID bits: Giving a program YOUR permissions when it runs

Normally, when a program runs under Linux, it inherits the permissions of the user who is running it, thus if I run a program under my account, the program runs with the same permissions that I would have if that program were me. Thus, if I cannot open a certain file, the program I am running also cannot open the file in question. If I set the SUID or SGID bit for a file, this causes any persons or processes that run the file to have access to system resources as though they are the owner of the file.

Set Up A Fileserver For Small/Medium Enterprises With SME Server 7.1

Set Up A Fileserver For Small/Medium Enterprises With SME Server 7.1

This tutorial shows how to set up a fileserver for small and medium enterprises with SME Server 7.1. SME Server is an open-source Linux server distribution (released under the GPL) based on CentOS that can turn a computer into a gateway, firewall, fileserver, printserver, mailserver (including webmail), etc. In this article we will focus on the fileserver aspect of SME Server.

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