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TOPIC 7.0

TOPIC 7.0. LINUX SERVICES AND CONFIGURATION. ROOT USER. Root user is called “ super user ” because it has power far beyond those of mortal user. As root, you can access files and change the system in way other user cannot.

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TOPIC 7.0

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  1. TOPIC 7.0 LINUX SERVICES AND CONFIGURATION

  2. ROOT USER • Root user is called “super user” because it has power far beyond those of mortal user. • As root, you can access files and change the system in way other user cannot. • If you want to install new software or tweak your system, you should log on as user.

  3. Samba • Free software, developed by Australian Andrew Tridgell. • Run on most unix and Unix-like system. • Released under GNUGeneral Public Licence. • The name Samba comes from SMB(Server Message Block).

  4. Features of Samba • Allow file and print sharing between computers running Windows and computers running Unix. • Set up network shares for chosen Unix directories. • Unix users can either mount the shares directly as part of their files structure using the smbmountcommand. • Each directory can have different access privileges overlaid on top of the normal Unix file protections.

  5. Advantages of Samba • Portable across multiple platforms. • Allow for easier networking of Windows workstations to computers running other platforms.

  6. Disadvantages of Samba • Maintaining compatibility with Microsoft’s implementation • Threat of legal action against commercial users of Samba.

  7. CUPS • A short of the Common Unix Printing System that allows a computer to add as print server. • The computer running CUPS is a host that can accept print jobs from clients computer, process them and send them to the appropriate printer. • Consists of a print spooler and scheduler. • Use the Internet Printing Protocol (IPP) as the basis for managing print jobs and queues • License under GNU General Public License and GNU Lesser General Public License version 2.

  8. Features of CUPS • Filter System • Can process a variety of data format on the print server • Converts the print job data into the final language of format of the printer via a series of filters • Uses MIME types for identifying file formats. • Scheduler • The CUPS scheduler implement IPP over HTTP/1.1 • Provides a web-based interface for managing print jobs, the configuration of the server, and for documentation about CUPS itself

  9. Advantages of CUPS • Already has commands for submitting, viewing and manipulating the job queue • You can easily set up a pool which will allocate jobs to slots as they become available • Can be used on/by remote machines easily • Adding extra job slots just means adding a new printer • Jobs can easily be paused or delayed • Can submit from Windows using SAMBA

  10. Disadvantages of CUPS • Has no way of adding job interdependence. • Probably doesn’t scale to several thousand processors well • You could end up with a lot of scrap paper if you use the wrong queue.

  11. SquirrelMail • SquirrelMail is a web-based email application started by Nathan and Luke Ehresman and written in the PHP scripting language. • It can be installed on almost all web servers as long as PHP is present and the web server has access to an IMAP and SMTP server. • SquirrelMail outputs valid HTML 4.0 for its presentation, making it compatible with a majority of current web browsers. • SquirrelMail uses a plugin architecture to accommodate additional features around the core application, and over 200 plugins are available on the SquirrelMail website. • Licensed under the GNU General Public License. • It is currently available in over 50 languages. • SquirrelMail is included in the repositories of many major GNU/Linux distributions • It is independently downloaded.

  12. Features of SquirrelMail • A templating system • A RPC interface for use by other applications as well as AJAX-enabled SquirrelMail template sets (skins) • A new initialization system • Faster login times due to improved message header caching • Security enhancements, such as HTTPOnly cookies • Improved usability/accessibility.

  13. Advantages of SquirrelMail • Support for text web browsers. • No JavaScript support required. • Easy integration into an already existing site. • Advanced skinning support.

  14. Disadvantages of SquirrelMail • A separate web server must be set up. • Moderate configuration required. • Low error control and tracing possibilities. • IMAP (Internet Message Access Protocol)must be enabled.

  15. Mailman • GNU Mailman is a computer software application from the GNU project for managing electronic mailing lists. • Mailman is coded primarily in Python and currently maintained by Barry Warsaw. • Mailman is free software, distributed under the GNU General Public License.

  16. Features of Mailman • A Web browser interface for list administration, archiving of messages, spam filtering. • A customizable home page for each mailing list. • Integrated bounce detection and automatic handling of bouncing addresses. • Integrated spam filters • Multiple list owners and moderators. • Support for virtual domains.

  17. Advantages of Mailman • Users email addresses, even the entire list, can be set as private. • Granular control over who can post. • Ability to easily suspend posts to the entire list on a temporary basis. • Users are free to subscribe and unsubscribe to a list at will. • Automatic removal of stale email addresses.

  18. Disadvantages of Mailman • Requires technical personnel establish and maintain list. • Can reveal everyone's email address included in the list. • Cannot provide granular control over who can post. • No facility for message moderation.

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