Sun To Offer Ubuntu Linux Based Servers

Posted on in Categories Hardware, Linux, Linux distribution, RedHat/Fedora Linux, Solaris, Suse Linux last updated March 19, 2008

Good news for all Debian / Ubuntu Linux fans. Sun has started to offer Ubuntu Linux based servers. Sun has systems competitively priced for small and medium businesses. Ubuntu is based upon rock solid Debian core. Look like Red hat and Novell going to have some nice competition. Sun offers x64-based systems certified for Ubuntu Linux:
* x64 Rack Servers

* Blade Servers

* x64 Workstations

* Workgroup Disk Storage

* Tape Automation

=> Sun SMB Product Page (Via Arun’s blog)

SAP To Roll Out ERP Linux Server Appliance

Posted on in Categories Hardware, Howto, Linux, Linux distribution, Make money with Linux, News, Suse Linux last updated March 5, 2008

SAP and Intel , the world’s biggest makers of business software and microchips, will jointly offer servers pre-packaged with SAP software aimed at medium-sized firms, the two companies said.

SAP aims to provide customers with a 45% savings on implementation and a 25% savings on total cost of ownership over what they’d typically spend for a comparable hardware/software combo, said Jans Peter Klaey, president of global SME at SAP, in an interview.

The server is available in five Northern European countries and should reach 20 countries this year.

=> SAP, Intel to offer out-of-the-box servers for SME’s

Lenovo to ship ThinkPads Notebook with Pre-installed SUSE Linux

Posted on in Categories Hardware, Linux, Linux desktop, Save money with FOSS, Suse Linux last updated January 13, 2008

Yet another computer vendor started to support Linux on Desktop.

Now, Lenovo is finally joining Dell as one of the first top-tier PC vendors to offer pre-installed Linux desktops to its customers. On Aug-07-2007, Lenovo and Novell announced an agreement to provide preloaded Linux on Lenovo ThinkPad notebook PCs and to provide support from Lenovo for the operating system. The companies will offer SUSE Linux Enterprise Desktop 10 from Novell to commercial customers on Lenovo notebooks including those in the popular ThinkPad T Series, a class of notebooks aimed at typical business users, beginning in the fourth quarter of 2007. The ThinkPad notebooks with the Linux-preload will also be available for purchase by individual customers.

PC vendor Lenovo has promised ThinkPads with pre-installed Novell SUSE Linux Enterprise Desktop 10 for some time now. Lenovo will deliver the goods the week of Jan. 14.

Lenovo will release pre-installed SLED 10 on its Intel Centrino processor-powered ThinkPad T61 and R61 14-inch-wide notebooks. In February, Lenovo’s pre-integrated Novell Linux offering will expand to include some Penryn-based ThinkPads.

=> Read more

rssh: Per User Configuration Options For Chroot Jail

Posted on in Categories Debian Linux, File system, FreeBSD, Howto, Linux, Networking, RedHat/Fedora Linux, Security, Suse Linux, Sys admin, Tuning, Ubuntu Linux, UNIX, User Management last updated December 22, 2007

rssh is a restricted shell for providing limited access to a host via ssh. It also allows system wide configuration and per user configuration. From the man page:
The user configuration directive allows for the configuration of options on a per-user basis. THIS KEYWORD OVERRIDES ALL OTHER KEYWORDS FOR THE SPECIFIED USER. That is, if you use a user keyword for user foo, then foo will use only the settings in that user line, and not any of the settings set with the keywords above. The user keyword’s argument consists of a group of fields separated by a colon (:), as shown below. The fields are, in order:

  • username : The username of the user for whom the entry provides options
  • umask : The umask for this user, in octal, just as it would be specified to the shell access bits. Five binary digits, which indicate whether the user is allowed to use rsync, rdist, cvs, sftp, and scp, in that order. One means the command is allowed, zero means it is not.
  • path : The directory to which this user should be chrooted (this is not a command, it is a directory name).

rssh examples of configuring per-user options

Open /etc/rssh.conf file:
# vi /etc/rssh.conf
All user tom to bypass our chroot jail:
user=tom:077:00010
Provide jerry cvs access with no chroot:
user=jerry:011:00100
Provide spike rsync access with no chroot:
user=spike:011:10000
Provide tyke access with chroot jail located at /users
user="tyke:011:00001:/users" # whole user string can be quoted
if your chroot_path contains spaces, it must be quoted. Provide nibbles scp access with chroot directory:
user=nibbles:011:00001:"/usr/local/tv/shows/tom and jerry"

Recommended readings:

=> rssh home page
=> Redhat specific chroot jail script (outdated)
=> Refer man pages: rssh.conf, rssh, ssh, sshd, sftp, scp, rsync, sshd_config

Print / Select a paper size other than A4 when using lp command line utility

Posted on in Categories CentOS, Debian Linux, Hardware, Howto, HP-UX, Linux, OpenBSD, Shell scripting, Suse Linux, Tuning, Ubuntu Linux, UNIX last updated December 21, 2007

Under Linux / UNIX you use lp command to print files from command prompt. lp is quite useful when GUI is not installed on Linux box to print files. The lp command is simply a front end command that calls the lpr command with appropriate options. Its main use is to allow the running of precompiled binary programs and scripts that assume that the lp command is the official printing command.

Changing papa size is very easy under GUI environment. But how do you change paper size under command prompt?
By default lp print to A4 paper size. However sometime you need to print to different paper size from command prompt such as A3 or A5. To print to A3 size, enter:
$ lp -o media=A3 /path/to/file
Where,

  • -o media=size : Sets the page size to size. Most printers support at least the size names “a4”, “letter”, and “legal”.

Other useful examples

Print a double-sided legal document to a printer called “hpljf2”:
$ lp -d hpljf2 -o media=legal -o sides=two-sided-long-edge /path/to/file
Print an image across 4 pages using a printer called “epd2”:
$ lp -d epd2 -o scaling=200 filename
Print a text file with 12 characters per inch, 8 lines per inch, and a 1 inch left margin to a printer called “lpodc2”:
$ lp -d lpodc2 -o cpi=12 -o lpi=8 -o page-left=72 ~/info.txt

To know more about lp option, enter:
$ man lp

Please note that you need to configure print using CUPS configuration file /etc/cups/cupsd.conf or web based tool located at http://localhost:631/
Linux / UNIX CUPS HP printer at http://localhost:631/
(Fig 01: My CUPS Configuration, showing HP PhotoSmart Printer )

How To: Double Linux disk read performance with readahead parameter

Posted on in Categories CentOS, Debian Linux, File system, Hardware, Howto, Linux, RedHat/Fedora Linux, Storage, Suse Linux, Tuning last updated November 22, 2007

The open source journal has published an interesting hack. It mostly applies to high-end, multiple-disk storage:

Under the right conditions (that is, with certain hardware configurations which I’ll identify later) it is possible to literally double your sequential read performance from disk. If you noticed the terrible performance of the 3Ware 9500S RAID controller and cared enough to investigate. It all has to do with a sneaky little block device parameter known as readahead. Without going into too much gory detail, readahead controls how much in advance the operating system reads when, well, reading, as its name implies. By default, some operating systems (in particular, RHEL5 Server) sets this to 256 (512-byte sectors), or about 128 KB. When dealing with large filesystems spanning many disks, this paltry figure can actually nuke your performance.

=> HowTo: Linux: Double your disk read performance in a single command