Free Linux Tutorials

Red Hat sponsored Fedora project managed to release 16th version of its Linux distribution, code-named “Verne”. Aside from package updates, it improve also in the areas of virtualization and cloud computing.

The official release notes can be found here, http://docs.fedoraproject.org/en-US/Fedora/16/html/Release_Notes/index.html

It is dedicated in memory of the creator of C programming language, and key developer of Unix OS, Dennis Ritchie.

Fedora 12 has been released,the latest innovative Linux distribution from the Fedora Project, a global, collaborative partnership of free software community members sponsored by Red Hat.

Fedora is a leading edge, free and open source operating system that continues to deliver innovative features to many users, with a new release about every six months. We bring to you the latest and greatest release of Fedora ever, Fedora 12! We have several major new features with special focus on desktops, netbooks, virtualization and system administration.

1. Wonder why you can’t send email from your linux server?

2. Is your mail server or 3rd party email hosting provider requires authentication for your outgoing server to send out emails successfully?

3. Are you using a default sendmail email client on your linux box and wonder why your getting maillog errors such as this:

——-sample sendmail maillog error from my nagios server—————
Oct  2 17:03:54 nms sendmail[25657]: n9293qiw025655: to=<nagios@freelinuxtutorials.com>,

ctladdr=<root@nms.freelinuxtutorials.com> (0/0), dela0928, relay=smtp.freelinuxtutorials.com.

[216.200.145.17], dsn=5.1.1, stat=User unknown
Oct  2 17:03:54 nms sendmail[25657]: n9293qiw025655: n9293siw025657: DSN: User unknown
Oct  2 17:03:54 nms sendmail[25657]: n9293siw025657: to=<root@nms.freelinuxtutorials.com>,

Setup VNC Server in Fedora

“Virtual Network Computing (VNC) is a desktop protocol to remotely control another computer. It transmits the keyboard presses and mouse clicks from one computer to another relaying the screen updates back in the other direction, over a network.” -WikiPedia-
This article describes in brief how to configure VNC server instances for one or multiple users on a remote machine, how to use VNC to start graphical applications on boot and finally how to enhance security by connecting to the server through encrypted SSH tunnels.

The procedure below was tested successfully on CentOS.  The same thing was also implemented on my BSD box and works as well.

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on Unix and Windows and is licensed under the GNU GPL.

Freeradius and MySQL

Software Requirements:

Any Linux distro, kernel 2.4xx-later(tested in CentOS,Fedora Core,RH)
MySQL Server 4.xx-5.xx
GCC compiler
vi editor

1.    Get the latest freeradius source code tarball from www.freeradius.org or get the rpm package using “yum”

2.    Unpack the tarball and install it.
#tar zxvf freeradius-xxx.tar.gz
#cd freeradius
#./configure
#make
#make install

3.    Start with a simple config using the standard text files, this will test if the Freeradius installed is working or not

a.    Edit /etc/raddb/clients.conf to enter the details of the NAS unit.You can enter “localhost” for testing purposes
b.    Edit /etc/raddb/users and create a sample user account

Linux.org presented one of the most detailed important events in the history of the Linux operating system development

1983
September    Richard M. Stallman announces the GNU Project, an attempt at creating a completely free operating system.

1984
January    Work begins on the GNU operating system

1985
October    Free Software Foundation established as a non-profit organization to promote the development of Free Software. Sponsors the GNU Project.

1987
January    Computer science professor Andrew Tannenbaum publishes the textbook Operating Systems: Design and Implementation which includes a copy of a teaching version of Unix called Minix.
December    Larry Wall releases version 1.0 of Perl