http://www.cyberciti.biz/tips This is a Linux sys admin journal by Vivek about sys admin work, Linux tips & tricks, hacks, news and more. Fri, 14 Jun 2013 21:36:33 +0000 en-US hourly 1 http://wordpress.org/?v=3.5.1 http://www.cyberciti.biz/tips/linux-send-wake-on-lan-wol-magic-packets.html http://www.cyberciti.biz/tips/linux-send-wake-on-lan-wol-magic-packets.html#comments Tue, 03 Apr 2012 19:53:01 +0000 nixCraft http://www.cyberciti.biz/tips/?p=8768 Wake-on-LAN (WOL) is an Ethernet networking standard that allows a server to be turned on by a network message. You need to send 'magic packets' to wake-on-lan enabled ethernet adapters and motherboards, in order to switch on the called systems. Make sure you connect the NIC (eth0 or eth1) with the motherboard, and enable the WOL function in the BIOS. This is a quick guide to enable WOL under RHEL / Fedora / CentOS / Debian / Ubuntu Linux. ]]> http://www.cyberciti.biz/tips/linux-send-wake-on-lan-wol-magic-packets.html/feed 10 http://www.cyberciti.biz/tips/linux-unix-bsd-documentations.html http://www.cyberciti.biz/tips/linux-unix-bsd-documentations.html#comments Wed, 21 Dec 2011 20:11:40 +0000 nixCraft http://www.cyberciti.biz/tips/?p=8323 Man pages are written by sys-admin and developers for IT techs, and are intended more as a reference than as a how to. Man pages are very useful for people who are already familiar with Linux, Unix, and BSD operating systems. Use man pages when you just need to know the syntax for particular commands or configuration file, but they are not helpful for new Linux users. Man pages are not good for learning something new for the first time. Here are thirty best documentation sites on the web for learning Linux and Unix like operating systems.]]> http://www.cyberciti.biz/tips/linux-unix-bsd-documentations.html/feed 30 http://www.cyberciti.biz/tips/download-ubuntu-linux-11-10-iso-cd-dvd-images-oneiric-ocelot.html http://www.cyberciti.biz/tips/download-ubuntu-linux-11-10-iso-cd-dvd-images-oneiric-ocelot.html#comments Thu, 13 Oct 2011 18:14:32 +0000 nixCraft http://www.cyberciti.biz/tips/?p=8121 Ubuntu Linux (a GNU/Linux-based computer operating system) version 11.10 has been released and available for download. The new release includes some enhancements to make your experience even more enjoyable. The Default user interface is set to unity shell on top of GNOME 3.x. However, you will get a 2D version of Unity as a fallback for systems that lack the hardware resources for the 3D version. The good news is you will be able to install the entire GNOME 3 desktop along with GNOME Shell directly from the Ubuntu repos.]]> http://www.cyberciti.biz/tips/download-ubuntu-linux-11-10-iso-cd-dvd-images-oneiric-ocelot.html/feed 33 http://www.cyberciti.biz/tips/debian-ubuntu-teaming-aggregating-multiple-network-connections.html http://www.cyberciti.biz/tips/debian-ubuntu-teaming-aggregating-multiple-network-connections.html#comments Sun, 04 Sep 2011 23:49:46 +0000 nixCraft http://www.cyberciti.biz/tips/?p=8008 NIC teaming is nothing but combining or aggregating multiple network connections in parallel. This is done to increase throughput, and to provide redundancy in case one of the links fails or Ethernet card fails. The Linux kernel comes with the bounding driver for aggregating multiple network interfaces into a single logical interface called bond0. In this tutorial, I will explain how to setup bonding under Debian Linux server to aggregate multiple Ethernet devices into a single link, to get higher data rates and link failover. ]]> http://www.cyberciti.biz/tips/debian-ubuntu-teaming-aggregating-multiple-network-connections.html/feed 16 http://www.cyberciti.biz/tips/ununtu-linux-install-removed-synaptic-package-manager.html http://www.cyberciti.biz/tips/ununtu-linux-install-removed-synaptic-package-manager.html#comments Sat, 25 Jun 2011 17:22:41 +0000 nixCraft http://www.cyberciti.biz/tips/?p=7888 Synaptic is a front-end for the apt package management system. The program allows you to perform all actions of the command line tool apt-get in a graphical environment such as installing, upgrading, downgrading and removing of single packages or even upgrading your whole system. The upcoming Ubuntu Linux version 11.10 (code named Oneiric Ocelot) has removed Synaptic Package Manager. ]]> http://www.cyberciti.biz/tips/ununtu-linux-install-removed-synaptic-package-manager.html/feed 26 http://www.cyberciti.biz/tips/download-ubuntu-linux-11-04-iso-cd-dvd-images-natty-narwhal.html http://www.cyberciti.biz/tips/download-ubuntu-linux-11-04-iso-cd-dvd-images-natty-narwhal.html#comments Sat, 30 Apr 2011 09:31:28 +0000 nixCraft http://www.cyberciti.biz/tips/?p=7773 The latest version of the popular Linux desktop distribution Ubuntu 11.04 has been released and available from the official project web site. This new version uses the Unity user interface instead of GNOME Shell as default desktop (user can switch back to classic Gnome desktop any time). New features since Ubuntu 10.10 includes - Banshee as the default music player, Mozilla Firefox 4, LibreOffice, Linux kernel v2.6.38.2, gcc 4.5, Python 2.7, dpkg 1.16.0, Upstart 0.9, X.org 1.10.1, Mesa 7.10.2, Shotwell 0.9.2, and Evolution 2.32.2.]]> http://www.cyberciti.biz/tips/download-ubuntu-linux-11-04-iso-cd-dvd-images-natty-narwhal.html/feed 36 http://www.cyberciti.biz/tips/download-ubuntu-linux-10-10-iso-cd-dvd-images.html http://www.cyberciti.biz/tips/download-ubuntu-linux-10-10-iso-cd-dvd-images.html#comments Mon, 11 Oct 2010 12:19:31 +0000 nixCraft http://www.cyberciti.biz/tips/?p=7354 The latest version of the popular Linux desktop distribution Ubuntu 10.10 has been released and available from the official project web site. New features since Ubuntu 10.04 includes - Gnome 2.32, KDE 4.5.0 (QT 4.7), new KDE browser Rekonq, Pulse Audio as the default sound server, Firefox 3.6.9, OpenOffice 3.2.1, Evolution 2.30.3, Shotwell, Btrfs with experimental support, kernel 2.6.35, and X.org version 1.9.]]> http://www.cyberciti.biz/tips/download-ubuntu-linux-10-10-iso-cd-dvd-images.html/feed 23 http://www.cyberciti.biz/tips/linux-install-rt2870-chipset-based-usb-wireless-adapter.html http://www.cyberciti.biz/tips/linux-install-rt2870-chipset-based-usb-wireless-adapter.html#comments Fri, 03 Sep 2010 18:05:04 +0000 nixCraft http://www.cyberciti.biz/tips/?p=7284 This blog post listed Linux Compatible USB wireless adapters. It seems that many new Linux users frequently have problems learning how to install RT2870 driver under Linux. I also received email requesting installation instructions for the same device. This quick tutorial will explains how to install RT2870 based chipset device with WPA2 authentication and TKIP wireless encryption. ]]> http://www.cyberciti.biz/tips/linux-install-rt2870-chipset-based-usb-wireless-adapter.html/feed 69 http://www.cyberciti.biz/tips/repetitive-strain-injury-prevention-software.html http://www.cyberciti.biz/tips/repetitive-strain-injury-prevention-software.html#comments Wed, 04 Nov 2009 05:21:00 +0000 nixCraft http://www.cyberciti.biz/tips/?p=5950 Repetitive strain injury (RSI) is occupational overuse syndrome, non-specific arm pain or work related upper limb disorder. RSI caused from overusing the hands to perform a repetitive task, such as typing, writing, or clicking a mouse. Unfortunately, most people do not understand what RSI is or how serious it can be. You can easily prevent RSI using open source software called Workrave.]]> http://www.cyberciti.biz/tips/repetitive-strain-injury-prevention-software.html/feed 14 http://www.cyberciti.biz/tips/linux-security.html http://www.cyberciti.biz/tips/linux-security.html#comments Fri, 30 Oct 2009 07:52:11 +0000 nixCraft http://www.cyberciti.biz/tips/?p=5687 Securing your Linux server is important to protect your data, intellectual property, and time, from the hands of crackers (hackers). The system administrator is responsible for security Linux box. In this first part of a Linux server security series, I will provide 20 hardening tips for default installation of Linux system.]]> http://www.cyberciti.biz/tips/linux-security.html/feed 116 http://www.cyberciti.biz/tips/download-ubuntu-linux-9-10-iso-cd-dvd-images.html http://www.cyberciti.biz/tips/download-ubuntu-linux-9-10-iso-cd-dvd-images.html#comments Thu, 29 Oct 2009 13:43:27 +0000 nixCraft http://www.cyberciti.biz/tips/?p=5869 The latest version of the popular Linux desktop distribution Ubuntu 9.10 has been released and available from the official project web site. New features since Ubuntu 9.04 includes - Firefox 3.5, GNOME 2.28, an enforcing AppArmor profile, Linux kernel 2.6.31, ext4 file system (default), Empathy instant messenger instead of Pidgin, the Ubuntu One client, which interfaces with Canonical's new on-line storage system. It also includes a new application called the Ubuntu Software Center. A quick screen-shot tour of new features available here on our website.]]> http://www.cyberciti.biz/tips/download-ubuntu-linux-9-10-iso-cd-dvd-images.html/feed 25 http://www.cyberciti.biz/tips/24-hours-with-ubuntu.html http://www.cyberciti.biz/tips/24-hours-with-ubuntu.html#comments Tue, 27 Oct 2009 18:17:03 +0000 nixCraft http://www.cyberciti.biz/tips/?p=5857 BBC's blogger Rory Cellan-Jones took Ubuntu Karmic Koala for 24 hours test drive and predicated that - "... Ubuntu will remain a very niche product - but it's Google's Android which could bring open-source to the mass consumer market...".]]> http://www.cyberciti.biz/tips/24-hours-with-ubuntu.html/feed 40 http://www.cyberciti.biz/tips/use-linux-live-cd-usb-for-online-banking.html http://www.cyberciti.biz/tips/use-linux-live-cd-usb-for-online-banking.html#comments Thu, 15 Oct 2009 12:53:55 +0000 nixCraft http://www.cyberciti.biz/tips/?p=5791 Internet has revolutionized the way online users can shop and avail banking services like internet Banking from anywhere, anytime without visiting bank. But, how safe is your money with online net-banking which allows to carry out money transfer? Companies and in some case individuals lost anywhere from $10,000 to $500,000 dollars because of a single malware infection. The cyber crooks are targeting innocent MS-Windows user. If you are concerned about how best to protect yourself from this type of fraud, use Linux LiveCD for online banking and avoid Microsoft Windows at all cost.]]> http://www.cyberciti.biz/tips/use-linux-live-cd-usb-for-online-banking.html/feed 6 http://www.cyberciti.biz/tips/celestia-astronomy-linux-program.html http://www.cyberciti.biz/tips/celestia-astronomy-linux-program.html#comments Wed, 30 Sep 2009 23:20:07 +0000 nixCraft http://www.cyberciti.biz/tips/?p=5745 Celestia is a real-time visual space simulation astronomy program. It is a cross platform, open source software and released under the GNU General Public License. NASA and ESA have used Celestia in their educational and for interfacing to trajectory analysis software. It allows users to travel through an extensive universe, modeled after reality, at any speed, in any direction and at any time in history. Celestia displays and interacts with objects ranging in scale from artificial satellites to entire galaxies in three dimensions using OpenGL. It is a perfect software for astronomer, educator, student, and teacher for astronomy purpose.]]> http://www.cyberciti.biz/tips/celestia-astronomy-linux-program.html/feed 11 http://www.cyberciti.biz/tips/linux-unix-bsd-openssh-server-best-practices.html http://www.cyberciti.biz/tips/linux-unix-bsd-openssh-server-best-practices.html#comments Fri, 24 Jul 2009 21:49:43 +0000 nixCraft http://www.cyberciti.biz/tips/?p=5489 OpenSSH is the implementation of the SSH protocol. OpenSSH is recommended for remote login, making backups, remote file transfer via scp or sftp, and much more. SSH is perfect to keep confidentiality and integrity for data exchanged between two networks and systems. However, the main advantage is server authentication, through the use of public key cryptography. From time to time there are rumors about OpenSSH zero day exploit. Here are a few things you need to tweak in order to improve OpenSSH server security.]]> http://www.cyberciti.biz/tips/linux-unix-bsd-openssh-server-best-practices.html/feed 135 http://www.cyberciti.biz/tips/lighttpd-set-throughput-connections-per-ip.html http://www.cyberciti.biz/tips/lighttpd-set-throughput-connections-per-ip.html#comments Sun, 21 Jun 2009 00:02:13 +0000 nixCraft http://www.cyberciti.biz/tips/?p=5148 If you do not control or throttle end users, your server may run out of resources. Spammers, abuser and badly written bots can eat up all your bandwidth. A webserver must keep an eye on connections and limit connections per second. This is serving 101. The default is no limit. Lighttpd can limit the throughput for each single connection (per IP) or for all connections. You also need to a use firewall to limit connections per second. In this article I will cover firewall and lighttpd web server settings to throttle end users. The firewall settings can be applied to other web servers such as Apache / Nginx and IIS server behind PF / netfilter based firewall.]]> http://www.cyberciti.biz/tips/lighttpd-set-throughput-connections-per-ip.html/feed 15 http://www.cyberciti.biz/tips/howto-resize-vmware-virtual-harddisk-size.html http://www.cyberciti.biz/tips/howto-resize-vmware-virtual-harddisk-size.html#comments Tue, 09 Jun 2009 14:22:42 +0000 nixCraft http://www.cyberciti.biz/tips/?p=4998 I've Windows Vista installed as a guest under Ubuntu Linux using VMWARE Workstation 6.0. This is done for testing purpose and browsing a few site that only works with Internet Explorer. Since I only use it for testing I made 16GB for Vista and 5GB for CentOS and 5GB in size for FreeBSD guest operating systems. However, after some time I realized I'm running out of disk space under both CentOS and Vista. Adding a second hard drive under CentOS solved my problem as LVM was already in use. Unfortunately, I needed to double 32GB space without creating a new D: drive under Windows Vista. Here is a simple procedure to increase your Virtual machine's disk capacity by resizing vmware vmdk file.]]> http://www.cyberciti.biz/tips/howto-resize-vmware-virtual-harddisk-size.html/feed 31 http://www.cyberciti.biz/tips/openofficeorg-new-user-orientation.html http://www.cyberciti.biz/tips/openofficeorg-new-user-orientation.html#comments Wed, 03 Jun 2009 11:26:39 +0000 nixCraft http://www.cyberciti.biz/tips/?p=4967 OpenOffice.org (OOo) is a freely available, full-featured office suite. OOo is both a software product and a community of volunteers that produces and supports the software. However, new users may get lost while finding help, support and productivity enhancing extensions. This blog post covers OOo new user orientation to to discover support, tutorials, community insights, templates, clip art, extensions, and blogs for OOo. ]]> http://www.cyberciti.biz/tips/openofficeorg-new-user-orientation.html/feed 0 http://www.cyberciti.biz/tips/linux-server-predicting-hardware-failure.html http://www.cyberciti.biz/tips/linux-server-predicting-hardware-failure.html#comments Tue, 02 Jun 2009 21:54:58 +0000 nixCraft http://www.cyberciti.biz/tips/?p=4951 The Blue Screen of Death (BSoD) is used for the error screen displayed by Microsoft Windows, after encountering a critical system. Linux / UNIX like operating system may get a kernel panic. It is just like BSoD. The BSoD and a kernel panic generated using a Machine Check Exception (MCE). MCE is nothing but feature of AMD / Intel 64 bit systems which is used to detect an unrecoverable hardware problem.

Program such mcelog decodes machine check events (hardware errors) on x86-64 machines running a 64-bit Linux kernel. It should be run regularly as a cron job on any x86-64 Linux system. This is useful for predicting server hardware failure before actual server crash.]]> http://www.cyberciti.biz/tips/linux-server-predicting-hardware-failure.html/feed 7 http://www.cyberciti.biz/tips/linux-investigate-sockets-network-connections.html http://www.cyberciti.biz/tips/linux-investigate-sockets-network-connections.html#comments Tue, 02 Jun 2009 12:56:31 +0000 nixCraft http://www.cyberciti.biz/tips/?p=4940 The ss command is used to show socket statistics. It can display stats for PACKET sockets, TCP sockets, UDP sockets, DCCP sockets, RAW sockets, Unix domain sockets, and much more. It allows showing information similar to netstat command. It can display more TCP and state information than other tools. It is a new, incredibly useful and faster (as compare to netstat) tool for tracking TCP connections and sockets. SS can provide information about:

• All TCP sockets.
• All UDP sockets.
• All established ssh / ftp / http / https connections.
• All local processes connected to X server.
• Filtering by state (such as connected, synchronized, SYN-RECV, SYN-SENT,TIME-WAIT), addresses and ports.
• All the tcp sockets in state FIN-WAIT-1 and much more.

]]> http://www.cyberciti.biz/tips/linux-investigate-sockets-network-connections.html/feed 10