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Linux

Sawing Linux Logs with Simple Tools

Post date: April 14, 2005, 12:04 Category: Security Views: 2708 Comments
Tutorial quote: So there you are with all of your Linux servers humming along happily. You have tested, tweaked, and configured until they are performing at their peak of perfection. Users are hardly whining at all. Life is good. You may relax and indulge in some nice, relaxing rounds of TuxKart. After all, you earned it.

Except for one little remaining chore: monitoring your log files. [insert horrible alarming music of your choice here.] You're conscientious, so you know you can't just ignore the logs until there's a problem, especially for public services like Web and mail. Somewhere up in the pointy-haired suites, they may even be plotting to require you to track and analyze all sorts of server statistics.

Not to worry, for there are many ways to implement data reduction, which is what log parsing is all about. You want to slice and dice your logs to present only the data you're interested in viewing. Unless you wish to devote your entire life to manually analyzing log files. Even if you only pay attention to logfiles when you're debugging a problem, having some tools to weed out the noise is helpful.
Linux

nBox - Envision your network with nBox (Embedded Ntop)

Post date: May 28, 2007, 22:05 Category: Network Views: 3532 Comments
Tutorial quote: The life of a systems or network administrator requires us to maintain an expansive understanding of our network infrastructure to more effectively manage it. Amidst volumes of complex data that some IT problems present and network management is no exception to these complications. Visual tools allow us to better see trends and make sense of the macro view of our networks. Ntop, nBox, nProbe are just the right FOSS tools that can help us gain greater insight.
Ubuntu

Recover deleted files from NTFS filesystem from Ubuntu Linux - Ntfsundelete

Post date: October 10, 2010, 05:10 Category: Security Views: 4101 Comments
Tutorial quote: If you have accidentally deleted files from your hard drive, don't panic! You can easily recover deleted files whether you are using a Windows PC (NTFS) or Linux OS. You can undelete files with almost guaranteed success. The most important thing is to act as soon as you realize that the files are lost.
Linux

Three tools to help you configure iptables

Post date: May 25, 2005, 14:05 Category: Network Views: 3085 Comments
Tutorial quote: Every user whose client connects to the Internet should configure his firewall immediately after installation. Some Linux distributions include firewall configuration as a part of installation, often offering a set of defaults configurations to choose from. However, to ensure that your machine presents the minimum "attack surface" (a measure of the number of vulnerable ports, user accounts, and sockets exposed to attack) to the predatory inhabitants of the Internet, you may need to do some manual configuration of your firewall. Here are three tools that can help.
The Linux kernel (version 2.4 onwards) contains a framework for packet filtering and firewalling using netfilter and iptables. Netfilter is a set of hooks inside the Linux kernel that allows kernel modules to register callback functions with the network stack. Iptables is a generic table structure for the definition of rulesets. Each rule within an IP table consists of a number of classifiers (iptables matches) and one connected action (iptables target). Iptables has extensive documentation that can be accessed online or by typing man iptables at the command line. Yet despite the depth of the documentation available for iptables, its complexity can be baffling.
OpenSolaris

Installing and Configuring OpenVPN in OpenSolaris

Post date: December 20, 2009, 16:12 Category: Software Views: 4424 Comments
Tutorial quote: Learn to install and configure the free OpenVPN software package under OpenSolaris. OpenVPN is an opensource VPN solution using SSL for encryption and certificate authentication. The tutorial teaches how to install & configure OpenVPN and create certificates for authentication.
Linux

Benchmarking Filesystems

Post date: April 12, 2005, 07:04 Category: Benchmarks Views: 2936 Comments
Tutorial quote: I recently purchased a Western Digital 250GB/8M/7200RPM drive and wondered which journaling file system I should use. I currently use ext2 on my other, smaller hard drives. Upon reboot or unclean shutdown, e2fsck takes a while on drives only 40 and 60 gigabytes. Therefore I knew using a journaling file system would be my best bet. The question is: which is the best? In order to determine this I used common operations that Linux users may perform on a regular basis instead of using benchmark tools such as Bonnie or Iozone. I wanted a "real life" benchmark analysis. A quick analogy: Just because the Ethernet-Over-Power-Lines may advertise 10mbps (1.25MB/s), in real world tests, peak speed is only 5mbps (625KB/s). This is why I chose to run my own tests versus using hard drive benchmarking tools.
Unix+clones

Using network transfer protocols

Post date: April 15, 2005, 18:04 Category: Network Views: 2155 Comments
Tutorial quote: Let's face it, most of us are in a rut when it comes to moving our files around. We learned how to use a simple FTP client years ago, and maybe even updated to a GUI FTP client when we were feeling particularly adventurous. There are actually a wealth of tools available for transferring files, and some of them perform automation functions that can easily assist your business in building site mirrors, synchronizing directory contents, and more.

Keep in mind that for many of the tools covered here, there's only really room to skim through their features. Some, such as wget and rsync, are full of useful capabilities for those brave enough to read their man pages and experiment.
Linux

How To Migrate Mailboxes Between IMAP Servers With IMAP TOOLS

Post date: October 27, 2011, 08:10 Category: Miscellaneous Views: 19325 Comments
Tutorial quote: This guide explains how you can migrate mailboxes between IMAP servers with IMAP TOOLS. IMAP TOOLS is a collection of Perl scripts that allow you to do various tasks with IMAP servers and also POP3 servers. In this article I will focus on the scripts imapcopy.pl (copies messages and mailboxes from one IMAP server to another) and pop3toimap.pl (copies POP3 messages to an IMAP server). Both scripts support SSL. If you specify port 993 (995 for POP3) then an SSL connection is initiated. If the port number is 143 (110 for POP3) then it will try a non-SSL connection. With any other value the port will be tested to see if it supports SSL. If so, SSL will be used to make the connection; otherwise a non-SSL connection will be made.
Debian

Gnu Privacy Guard (GPG)

Post date: March 21, 2006, 19:03 Category: Security Views: 2770 Comments
Tutorial quote: GNU Privacy Guard, or GPG, is a free replacement for the famous encryption tool PGP written by Phil Zimmermann. It is a tool for secure communication and data storage. It can be used to encrypt data and to create digital signatures. Here we'll provide a quick introduction to generating a key-pair and using it for basic tasks.
Linux

HOWTO backup your linux system using bash, tar and netcat

Post date: April 2, 2006, 22:04 Category: System Views: 2741 Comments
Tutorial quote: I recently ran into the problem of not having enough hard drive space on my slackware linux laptop, but was lucky enough to have a much bigger drive sitting around from before and wanted a way to perform a hassle free seamless upgrade. i had this idea and it worked pretty well so i thought i would share it since i think it's pretty cool and only requires the use of two tools that should be included with all distributions.
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