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20 Linux System Monitoring Tools Every SysAdmin Should Know

"#Evitar escaneos, manipulación e inyeccion SQL (SQL, XSS, etc) RewriteCond %{HTTP_USER_AGENT} ^$ [OR] RewriteCond %{HTTP_USER_AGENT} ^(-|\.|') [OR] RewriteCond %{HTTP_USER_AGENT} ^(.*)(|%3C|%3E)(.*) [NC,OR] RewriteCond %{HTTP_USER_AGENT} ^(java|curl|wget)(.*) [NC,OR] RewriteCond %{HTTP_USER_AGENT} ^(.*)(libwww-perl|libwwwperl|snoopy|curl|wget|winhttp|python|nikto|scan|clshttp|archiver|loader|email|harvest|fetch|extract|grab|miner|suck|reaper|leach|havij)(.*) [NC,OR] RewriteCond %{REQUEST_URI} ^(/,|/;|/|/'|/`|/%2C|/%3C|/%3E|/%27|/////) [NC,OR] RewriteCond %{HTTP_REFERER} ^(.*)(%00|%08|%09|%0A|%0B|%0C|%0D|%0E|%0F|%2C||'|%3C|%3E|%26%23|%27|%60)(.*) [NC,OR] RewriteCond %{QUERY_STRING} ^(.*)(%00|%08|%09|%0A|%0B|%0C|%0D|%0E|%0F|%2C|%3C|%3E|%27|%26%23|%60)(.*) [NC,OR] RewriteCond %{HTTP_COOKIE} ^(.*)(|'|%3C|%3E|%27)(.*) [NC] RewriteRule ^(.*)$ index.php [NC] #Evita manipulacion en la URL RewriteCond %{REQUEST_METHOD} ^(HEAD|TRACE|DELETE|TRACK) [NC,OR] RewriteCond %{THE_REQUEST} ^.*(\\r|\\n|%0A|%0D).* [NC,OR] RewriteCond %{HTTP_REFERER} ^(.*)(|'|%0A|%0D|%27|%3C|%3E|%00).* [NC,OR] RewriteCond %{HTTP_COOKIE} ^.*(|'|%0A|%0D|%27|%3C|%3E|%00).* [NC,OR] RewriteCond %{REQUEST_URI} ^/(,|;|:||">|"|'|%0A|%0D|%27|%3C|%3E|%00).* [NC,OR] RewriteCond %{QUERY_STRING} ^.*(;||'|"|\)|%0A|%0D|%22|%27|%3C|%3E|%00).*(/\*|union|select|insert|cast|set|declare|drop|update|md5|benchmark).* [NC,OR] RewriteCond %{QUERY_STRING} ^.*(localhost|loopback|127\.0\.0\.1).* [NC,OR] RewriteCond %{QUERY_STRING} ^.*(|'|%0A|%0D|%27|%3C|%3E|%00).* [NC] RewriteRule ^(.*)$ index.php [NC] #Complica l

Object Oriented Programming in bash

A disk usage analyzer with an ncurses interface.

The disk's ITR rating and internal cache size can be critical when tuning maxcontig (maximum contiguous I/O size). Note: maxphys and maxcontig must be tuned at the same time. The unit of measurement for maxphys is bytes; maxcontig is in blocks. maxcontig can be changed via the mkfs, newfs or tunefs commands.

These notes are intended to help users and system administrators maximize TCP/IP performance on their computer systems. They summarize all of the end-system (computer system) network tuning issues including a tutorial on TCP tuning, easy configuration checks for non-experts, and a repository of operating system specific instructions for getting the best possible network performance on these platforms

Linux screen command tutorial ggarron | April 30, 2010 - 3 weeks 5 days  in Linux command line Linux tips I have face this lots of times, I am connected to my server using ssh, then I start a download, a log processing or a bittorrent download. I realize that task is going to take a lot of time. What to do?, well usually one have leave the ssh session open, and the home computer on. What if the ssh session just drops? all work is done, and there is the need to start all over again. I have used nohup command to execute commands after exit from the shell prompt. But there are other options, one of them is screen.

Welcome to the MultiGet Home page! MultiGet is an easy-to-use GUI file downloader for Windows/Linux/BSDs/MacOs.  It's programmed in C++ and has a GUI based on wxWidgets. It supports HTTP/FTP protocols which covers the requirements of most users. It supports multi-task with multi-thread on multi-server. It supports resuming downloads if the Web server supports it, and if you like, you can reconfig the thread number without stopping the current task. It's also support SOCKS 4,4a,5 proxy, ftp proxy, http proxy. In v0.8.0, a new feature was introduced, that is so called P2SP, or in other words , get file from multiple servers, and combine the data from different site into one file. This makes downloads complete much faster. MultiGet also supports switching language dynamically, you can choose Chinese or English interface.  Generally it will automatic choose a proper language for you. At this time(version 1.1.1), MultiGet can run on Windows 2000/XP, almost all Linux desktops, MacOs, BSDs. It can only depends on GTK+ runtime environment in Linux if statically linked with wxWidgets. It was tested on many system such as : Windows 2000, ubuntu ,kubuntu, xubuntu, fc5, opensuse10.4, mandriva 2007, MEPIS 6.0, PCLinuxOS, CentOS4.4, Puppy2.0, Xandros, edubuntu, RedFlag workstation 5, MagicLinux, dubuntu, archlinux, Hiweed, FreeBSD, MacOS etc.

"Ksplice: Upgrade / Patch Your Linux Kernel Without Reboots by Vivek Gite · 5 comments Generally, all Linux distributions needs a scheduled reboot once to stay up to date with important kernel security updates. RHN (or other distro vendors) provides Linux kernel security updates. You can apply kernel updates using yum command or apt-get command line options. After each upgrade you need to reboot the server. Ksplice service allows you to skip reboot step and apply hotfixes to kernel without rebooting the server. In this post I will cover a quick installation of Ksplice for RHEL 5.x and try to find out if service is worth every penny."

Splunk is the world's leading software used to monitor, report and analyze live streaming IT data as well as terabytes of historical data - located on-premises or in the cloud. More than 1,850 organizations in 70 countries use Splunk to gain valuable insights from their IT data to improve service levels, reduce IT operations costs, mitigate security risks, and drive new levels of operational visibility.

FOG is a Linux-based, free and open source computer imaging solution for Windows XP, Vista and 7 that ties together a few open-source tools with a php-based web interface. FOG doesn't use any boot disks, or CDs; everything is done via TFTP and PXE.

How-to describing importing and setting up a RedHat install server with Cobbler.

How-to regarding unattended Debian installation with preseeding.