Did You Know? netcat is a unix utility which reads and writes data across network connections, using TCP or UDP protocol. It's designed to be a reliable back-end tool that can be used directly or easily driven by other programs and scripts. At the same time, it's a feature-rich network debugging and exploration tool, since it can create almost any kind of connection you would need and has several interesting built-in capabilities. Netcat, or "nc" as the actual program is named, should have been supplied long ago as another one of those cryptic but standard Unix tools.

ISSN 1836-5930

Receive Your Complimentary Guide to Linux NOW!

A Newbie's Getting Started Guide to Linux

Linux from Scratch - Create Your Own Linux System - Free eBook

The GNU/Linux Advanced Administration

A Complete Beginner's Manual for Ubuntu 10.04 (Lucid Lynx)

Poll

Do you care about your privacy when using a FACEBOOK?

Yes, I do and stopped using Facebook.

No, I do not ! I have nothing to hide.

I'm a Linux user, I do not have time for Facebook.

No comment ! Facebook sucks !

linuxconfig.org
is hosted by:

Passwordless ssh

Article Index
1. Create key
2. Copy key to remote host
3. Login to remote host

Public key authentication allows you to login to a remote host via the SSH protocol without a password and is more secure than password-based authentication. Try creating a passwordless connection from linuxconfig.local to linuxconfig.org using public-key authentication.

1. Create key

Press ENTER at every prompt.

linuxconfig.local$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/user/.ssh/id_rsa):
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/user/.ssh/id_rsa.
Your public key has been saved in /home/user/.ssh/id_rsa.pub.
The key fingerprint is:
b2:ad:a0:80:85:ad:6c:16:bd:1c:e7:63:4f:a0:00:15 user@host
The key's randomart image is:
+--[ RSA 2048]----+
|  E.             |
| .               |
|.                |
|.o.              |
|.ooo o. S        |
|oo+ * .+         |
|++ +.+...        |
|o. ...+.         |
|  .   ..         |
+-----------------+
linuxconfig.local$

For added security '''the key itself''' would be protected using a strong ''passphrase''. If a passphrase is used to protect the key, ssh-agent can be used to cache the passphrase.

2. Copy key to remote host

linuxconfig.local$ ssh-copy-id root@linuxconfig.org
root@linuxconfig.org's password:
Now try logging into the machine, with "ssh 'root@linuxconfig.org'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.
linuxconfig.local$

Note that no password is required.

linuxconfig.local$ ssh root@linuxconfig.org
Last login: Tue Apr  3 12:47:53 2007 from 192.168.0.39
 linuxconfig.org#

Get FREE complimentary Linux Guides
	The GNU/Linux Advanced Administration The GNU/Linux systems have reached an important level of maturity, allowing to integrate them in almost any kind of work environment, from a desktop PC to the sever facilities of a big company. In this ebook "The GNU/Linux Operating System", the main contents are related with system administration. You will learn how to install and configure several computer services, and how to optimize and synchronize the resources using GNU/Linux. The topics covered in this 500+ page eBook include Linux network, server and data administration, Linux kernel, security, clustering, configuration, tuning, optimization, migration and coexistence with non-Linux systems. A must read for any serious Linux system admin.
	A Newbie's Getting Started Guide to Linux Learn the basics of the Linux operating systems. Get to know what it is all about, and familiarize yourself with the practical side. Basically, if you're a complete Linux newbie and looking for a quick and easy guide to get you started this is it. You've probably heard about Linux, the free, open-source operating system that's been pushing up against Microsoft. It's way cheaper, faster, safer, and has a far bigger active community than Windows, so why aren't you on it? Don't worry, Makeuseof.com understands. Like many things, venturing off into a completely unknown world can seem rather scary, and also be pretty difficult in the beginning. It's while adapting to the unknown, that one needs a guiding, and caring hand. This guide will tell you all you need to know in 20 illustrated pages, helping you to take your first steps. Let your curiosity take you hostage and start discovering Linux today, with this manual as your guide! Don't let Makeuseof.com keep you any longer, and download the Newbie's Initiation to Linux. With this free guide you will also receive daily updates on new cool websites and programs in your email for free courtesy of MakeUseOf.
	Linux from Scratch Linux from Scratch describes the process of creating your own Linux system from scratch from an already installed Linux distribution, using nothing but the source code of software that you need. This 318 page eBook provides readers with the background and instruction to design and build custom Linux systems. This eBook highlights the Linux from Scratch project and the benefits of using this system. Users can dictate all aspects of their system, including directory layout, script setup, and security. The resulting system will be compiled completely from the source code, and the user will be able to specify where, why, and how programs are installed. This eBook allows readers to fully customize Linux systems to their own needs and allows users more control over their system.
	A Complete Beginner's Manual for Ubuntu 10.04 (Lucid Lynx) Getting Started with Ubuntu 10.04 (Lucid Lynx) is a comprehensive beginners guide for the Ubuntu operating system; it features comprehensive guides, How Tos and information on anything you need to know after first installing Ubuntu. Designed to be as user-friendly and easy to follow as possible, it should provide the first point of reference to any Ubuntu newcomer with lots of information. The manual has step by step instructions and includes lots of screenshots to show you how to do tasks. It also includes a Troubleshooting section to help you solve common Ubuntu problems quickly. Download this 160+ page manual today.

Add New
Search

Comments (1)

2010-06-17 15:48:19 |Your IP address:15.219.201.xxx| manas

Is there any way that i can do password less SSH login to ILO IP of a linux server ??

Reply Quote