Linux Installation And Shamba Server

LinuxPresentation By Mayur VermaMCA 3rd sem

• History and installation of Linux• Installation and some Feature• Applications of Red Hat• Commands • C programing in shell• Shell Programing with Vi/G Edit• Scheduling of Linux• Memory Management • Interrupts and Exception• Interrupts Handling• Networking• Samba Configuration

Overview

Why we use LINUXLinux is free of charge .

Linux is more secured than any other server and computer

It has a wide compatibility to several hardware

Easy to Operate

It comes inclusive of drivers

Smooth and easy Updating Process

Linux has a community support

Less memory use

• In 80’s, Microsoft’s DOS was the dominated OS for PC

• Apple MAC was better, but expensive• UNIX was much better, but much, much more

expensive. Only for minicomputer for commercial applications

• People was looking for a UNIX based system, which is cheaper and can run on PC

• Both DOS, MAC and UNIX were proprietary, i.e., the source code of their kernel is protected

• No modification is possible without paying high license fees

Before Linux

All modern operating systems have their roots in 1969 when Dennis Ritchie and Ken Thompson developed the C language and the Unix operating system at AT&T Bell Labs. They shared their source code (yes, there was open source back in the Seventies) with the rest of the world, including the hippies in Berkeley California. By 1975, when AT&T started selling Unix commercially, about half of the source code was written by others.

In 1969

In 1980

In the Eighties many companies started developing their own Unix: IBM created AIX , Sun SunOS (later Solaris), HP HP-UX and about a dozen other companies did the same. The result was a mess of Unix dialects and a dozen different ways to do the same thing. And here is the first real root of Linux , when Richard Stallman aimed to end this era of Unix separation and everybody re-inventing the wheel by starting the GNU project (GNU is Not Unix). His goal was to make an operating system that was freely available to everyone, and where everyone could work together (like in the Seventies). Many of the command line tools that you use today on Linux are GNU tools.

• A famous professor Andrew Tanenbaum developed Minix, a simplified version of UNIX that runs on PC

• Minix is for class teaching only. No intention for commercial use• In Sept 1991, Linus Torvalds, a second year student of

Computer Science at the University of Helsinki, developed the preliminary kernel of Linux, known as Linux version 0.0.1.

• He put the source code online, thinking it would never support anything but 386 hardware. Many people embraced the combination of this kernel with the GNU tools, and the rest, as they say, is history.

In 1990’s

GNU projectEstablished in 1984 by Richard Stallman, who believes that software should be free from restrictions against copying or modification in order to make better and efficient computer programs

Today more than 97 percent of the world's supercomputers (including the complete top 10),more than 80 percent of all smartphones, many millions of desktop computers, around 70 percent of all web servers, a large chunk of tablet computers, and several appliances (dvd-players, washing machines, dsl modems, routers, self-driving cars, space station laptops...)run Linux . Linux is by far the most commonly used operating system in the world. Linux kernel version 4.0 was released in April 2015. Its source code grew by several hundred thousand lines (compared to version 3.19 from February 2015) thanks to contributions of thousands of developers paid by hundreds of commercial companies including Red Hat, Intel, Samsung, Broadcom, Texas Instruments, IBM, Novell, Qualcomm, Nokia, Oracle, Google, AMD and even Microsoft (and many more).

In 2015

Today more than 97 percent of the world's supercomputers (including the complete top 10),more than 80 percent of all smartphones, many millions of desktop computers, around 70 percent of all web servers, a large chunk of tablet computers, and several appliances (dvd-players, washing machines, dsl modems, routers, self-driving cars, space station laptops...)run Linux

Growing and growing…

Linux: No of Users

138712 155679users registered machines registered

Free software, as defined by the FSF (Free Software Foundation), is a "matter of liberty, not price." To qualify as free software by FSF standards, you must be able to:

• Run the program for any purpose you want to, rather than be restricted in what you can use it for.

• View the program's source code. • Study the program's source code and modify it if you need to. • Share the program with others. • Improve the program and release those improvements so that others can use

them.

Linux - free software

Installing Red Hat

Applications

Red Hat Enterprise Linux includes several text editors, applications that allow you to view and modify plain text files. Plain text files are files that contain text without any font or style formatting applied to it, such as system logs and configuration files. To start gedit, click Main Menu => Accessories => Text Editor. You can also start gedit by typing gedit at a shell prompt.

Editing Text File (gedit)

If you are not using a graphical desktop and want to read and modify a text or configuration file, Red Hat Enterprise Linux includes the vi (pronounced vee-eye) text editor. vi is a simple application that opens within the shell prompt and allows you to view, search, and modify text files. To start vi, type vi at a shell prompt. To open a file with vi type vi <filename> at a shell prompt.

Shell Prompt Text Editor

A PDF (Portable Document Format) file is an electronic image of a document. An open source application called xpdf is included with Red Hat Enterprise Linux. The xpdf toolbar at the bottom has navigational tools that let you move backward and forward through the PDF document, as well as standard zoom, print, and find tools. The xpdf man page provides useful information on the xpdf options. To view the xpdf man page, at a shell prompt type man xpdf

To view a PDF with xpdf:

In your desktop environment, go to Main Menu => Graphics => PDF Viewer. You can also launch xpdf by typing xpdf at a shell prompt.Right-click in the xpdf screen to display a list of options.Select Open to display the file browser.Select the PDF file you want to view and click Open.

Viewing PDFs

Playing Audio CDsTo play an audio CD, place the CD in your CD-ROM drive. The CD Player application should appear automatically and begin playing the first audio track. If the interface does not appear, click Main Menu => Sound & Video => CD Player to launch the CD Player application.

Audio, Video, and General Amusement

Playing Digital Audio FilesDigital audio has become very popular in recent years. Users enjoy the technology because the sound quality is excellent compared to analog tape or records, and the files are compact (audio files can easily be transferred across the Internet).To take advantage of this technology, Red Hat Enterprise Linux includes the powerful X Multimedia System (XMMS), a cross-platform multimedia player which allows you to play several digital audio file formats.

XMMS InterfaceXMMS can be used for more than just playing digital audio files. By default XMMS can play Ogg Vorbis, RIFF wave, and most module formats. Additionally, XMMS can be extended via plugins to play a number of other digital multimedia formats.To launch XMMS, go to Main Menu => Sound & Video => Audio Player.To launch XMMS from a shell prompt, type the command xmms

Applications

Troubleshooting Your Sound CardIf, for some reason, you do not hear sound and know that you do have a sound card installed, you can run the Sound Card Configuration Tool utility. To use the Sound Card Configuration Tool, choose Main Menu => System Settings => Soundcard Detection. A small text box pops up prompting you for your root password.

The Sound Card Configuration Tool utility probes your system for sound cards. If the utility detects a plug and play sound card, it automatically tries to configure the correct settings for your card. You can then click the Play test sound button to play a sound sample. If you can hear the sample, select OK and your sound card configuration is complete.

If the Sound Card Configuration Tool does not work then you can edit your modules.conf file.You can manually edit your /etc/modules.conf file to include the sound card module that it should use

Manual Sound Card Configuration

Video card configuration is handled during the Red Hat Enterprise Linux installation . However, if you did not choose to configure a video card at that time, or if you need to reconfigure your settings, you can use the X Configuration Tool utility.

To run the X Configuration Tool, click Main Menu => System Settings => Display. A pop-up window prompts you for your root password. You can also start from a shell prompt by typing the command redhat-config-xfree86, which then prompts you to enter your root password. If you are working from a shell prompt and X is not working, redhat-config-xfree86 attempts to start a minimal X session to allow you to continue your configuration. Follow the instructions that appear on the screen. The X Configuration Tool attempts to automatically configure your video card and monitor settings for you.

Troubleshooting your video card

X Configuration ToolTo configure your monitor manually, click the Advanced tab, then click the Configure... button next to the Monitor Type entry. A pop-up window displays a list of monitor models. Choose your model and click OK. You can also let the X Configuration Tool probe your monitor for the correct model and vertical/horizontal frequency settings. To configure your video card manually, click the Advanced tab, then click the Configure... button next to the Video Card entry. A pop-up window displays a list of video card models. Choose your model and click OK. You can also let the X Configuration Tool probe your video card for the correct model and settings by clicking the Probe Videocard button.When you have finished reconfiguring your video card and monitor, you should be able to start an X session and enjoy your graphical desktop environment.

Game availability depends on the variant of Red Hat Enterprise Linux you installed. You must have those game packages installed before they appear under the Main Menu => Games menu. Refer to the Red Hat Enterprise Linux System Administration Guide for details on installing additional packages.

Games

Red Hat Enterprise Linux supports over 100 digital camera models. So, whether your camera uses a USB or serial port to communicate with your computer, it is likely that Red Hat Enterprise Linux supports it.gtKam is a graphical application that allows you to interface with your digital camera. gtKam works directly with your digital camera, allowing you to open, view, save, and delete images directlyTo start gtKam, choose Main Menu => Graphics => Digital Camera Tool. You can also start gtKam by typing gtkam at a shell prompt.Before you begin using gtKam, you need to configure it to work with your digital camera. From the menu, choose Camera => Add Camera.... From the pop-up dialog, you can choose your camera from the drop-down list or let gtKam automatically find your camera by clicking Detect. Click Apply to accept the changes and OK to close the dialog box.

Using gtKam

Adding a Camera in gtKamOnce you have added your camera, it will be shown as an icon on the left panel of the main gtKam window. You only have to configure gtKam for your camera once; the settings will be saved with each additional use.Directories shown below the icon may differ depending on your brand of camera. Select the directory that commonly stores your images and the stored images will immediately load as thumbnail images in the main panel. From this panel, click on the images you want, which you can then save to disk by choosing File => Save Selected Photos. If you want to save all of the stored images, choose Select => All, then save the images to disk.

Directories: File and directory paths in UNIX use the forward slash "/" to separate directory names in a path. examples: / "root" directory /usr directory usr (sub-directory of / "root" directory) /usr/STRIM100 STRIM100 is a subdirectory of /usr

Moving around the file system:

pwd Show the "present working directory", or current directory. cd Change current directory to your HOME directory. cd .. Change current directory to the parent directory of the current directory.

Linux Command

Listing directory contents:

ls : list a directory ls -l : list a directory in long ( detailed ) format for example:

ls –a : List the current directory including hidden files. Hidden files start with "."

Manipulating files

Vi text editor

By far, the most useful and powerful thing you can do with I/O redirection is to connect multiple commands together with what are called pipes(|). With pipes, the standard output of one command is fed into the standard input of another. Here is my absolute favorite:

[me@linuxbox me]$ ls -l | less

In this example, the output of the ls command is fed into less. By using this "| less" trick, you can make any command have scrolling output. I use this technique all the time.

Pipes

Commands that let you determine what is going on with your system. pwd Print working directory, i.e., display the name of my current directory on the screen. hostname Print the name of the local host (the machine on which I am working). Use netconf (as root) to change the name of the machine. whoami Print my login name. id username Print user id (uid) and his/her group id (gid), effective id (if different than the real id) and the supplementary groups. date Print the operating system current date, time and timezone. For an ISO standard format, I have to use date -Iseconds.

Some Commands

who Determine the users logged on the machine. w Determine who is logged on the system, find out what they are doing, their processor ussage, etc. Handy security command. rwho -a (=remote who) Determine users logged on other computers on your network. The rwho service must be enabled for this command to run. If it isn't, run setup (RedHat specific) as root to enable "rwho". finger user_name System info about a user. Try: finger root . One can use finger with any networked computer that exposes the finger service to the world, e.g., I can do (try): finger @finger.kernel.org last Show listing of users last logged-in on your system. Really good idea to check it from time to time as a security measure on your system. lastb ("=last bad") Show the last bad (unsuccessful) login attempts on my system.

Some Commands

history | more Show the last (1000 or so) commands executed from the command line on the current account. The "| more" causes the display to stop after each screen-full. To see what another user was doing on your system, login as "root" and inspect his/her "history". comman Run the most recent command from my bash history commands that starts with the string "comman". This is usefull for re-running often the same, command which may be complicated to type. uptime Show the amount of time since the last reboot. ps (="print status" or "process status") List the processes currently run by the current user.

Some Commands

free Memory info (in kilobytes). "Shared" memory is the memory that can be shared between processes (e.g., executable code is "shared"). df -h (=disk free) Print disk info about all the filesystems (in human-readable form). du / -bh | more (=disk usage) Print detailed disk usage for each subdirectory starting at the "/" (root) directory (in human legible form). cat /proc/cpuinfo Cpu info - shows the content of the file cpuinfo. Note that the files in the /proc directory are not real files - they are hooks to look at information available to the kernel. cat /proc/interrupts List the interrupts in use. May need to find out before setting up new hardware. cat /proc/version Linux version and other info.

Some Commands

cat /proc/filesystems Show the types of filesystems currently in use. cat /etc/printcap |more Show the setup of printers.

Some Commands

C programming in Linux

Shell Scripting

Working with Shell Scripting

Shell Scripts

Loops

While Loop

Condition

Condition (Case)

Comparison

Comparison

Array

Functions

Parameter

Scheduling in Linux

Process Scheduling

Two Level Implementation

Linux vs. Two Level

Advantage

Linux File Structure

• Linux: first developed on a minix system• Both OSs shared space on the same disk• So Linux reimplemented minix file system• Two severe limitations in the minix FS

– Block addresses are 16-bits (64MB limit)– Directories use fixed-size entries (w/filename)

Cross-development

Originally written by Chris ProvenzanoExtensively rewritten by Linux TorvaldsInitially released in 1992Removed the two big limitations in minixUsed 32-bit file-pointers (filesizes to 2GB)Allowed long filenames (up to 255 chars)Question: How to integrate ext into Linux?

Extended File System

Multiple file systems need to coexistBut filesystems share a core of common concepts and high-level operationsSo can create a filesystem abstractionApplications interact with this VFS

The Virtual File System idea

Task 1 Task 2 Task n…user space

kernel space

VIRTUAL FILE SYSTEM

minix ext2 msdos proc

device driverfor hard disk

device driver for floppy disk

Buffer Cache

softwarehardware

Hard Disk Floppy Disk

Linux Kernel

• Two new filesystems introduced in 1993• Both tried to overcome Ext’s limitations• Xia was based on existing minix code• Ext2 was based on Torvalds’ Ext code• Xia was initially more stable (smaller)• But flaws in Ext2 were eventually fixed• Ext2 soon became a ‘de facto’ standard

Xia and Ext2 File systems

• Files are represented by inodes• Directories are special files (dentries)• Devices accessed by I/O on special files• UNIX filesystems can implement ‘links’

Common concepts

Directory •These are structured in a tree hierarchy•Each can contain both files and directories•A directory is just a special type of file•Special user-functions for directory access•Each directory contains filename + inode-no•Kernel searches the directory tree •translates a pathname to an inode-number

Linux Directory Structure

1. / root:• Every single file and directory starts from the root directory.• Only root user has write privilege under this directory.• It treat every thing as file.

2 /boot – Boot Loader Files• Contains boot loader related files.• Grub(Grand unified boot loader) files are located under /boot.

3 /home – Home Directories• Home directories for all users to store their personal files.• For example: /home/mohan or /home/sohan

Directory is Mapping b/w user and folderSome Directories

4 /usr – User Programs

• Contains binaries, libraries, documentation, and source-code for second level programs.• /usr/bin contains binary files for user programs. If you can’t find a user binary under /bin,

look under /usr/bin. • /usr/local contains users programs that you install from source. For example, when you

install apache from source, it goes under /usr/local/apache2

5 /etc – Configuration Files• Contains configuration files required by all programs in plain text format.• This also contains startup and shutdown shell scripts used to start/stop individual

programs.

6 /tmp – Temporary Files• Directory that contains temporary files created by system and users.• Files under this directory are deleted when system is rebooted.

Inode Table Directoryi1

i2

i3

i4

name1

name2

name3

name4

Directory diagram

• A structure that contains file’s description:– Type– Access rights– Owners– Timestamps– Size– Pointers to data blocks

• Kernel keeps the inode in memory (open)

Inode

inode

File info

Direct blocksIndirect blocks

DoubleIndirect Blocks

Inode diagram

• Multiple names can point to same inode• The inode keeps track of how many links• If a file gets deleted, the inode’s link-count gets

decremented by the kernel• File is deallocated if link-count reaches 0• This type of linkage is called a ‘hard’ link• Hard links may exist only within a single FS• Hard links cannot point to directories (cycles)

Links

Network Configuration

Networking

General Network Configuration ProcedureTo connect a host to the network, the administrator needs the following information.

·   Host name for the system·   Domain name for the system·   IP address for the system·   Netmask for the network (if applicable)·   Default router (gateway) for the network·   Name service used on the network·   Name or address of the machine providing name service

Once you have this information, you can configure the machine and “plug it in” to the network.

Common UNIX Configuration FilesNetwork configuration information is stored in several files on the system.

Most of the OS installers ask for the previously listed information and configure the system for network operation. Where is all of this information stored? How do you make changes to the network configuration without reloading the operating system?

/etc/hostname.if_name FileMany versions of UNIX use files in the /etc directory to aid in the configuration of individual interfaces on the system.

For example, Solaris uses files with the generic name /etc/hostname.if_name to simplify system configuration at boot time. The device name of the network interface is substituted for the if_name portion of the file name. For a host with an on-board hme Ethernet device, connected to a single network, the /etc/hostname.hme0 file would contain the host name to be used by that interface. Machines connected to multiple networks would have multiple /etc/host name.if_name files. Solaris also uses a file called /etc/hostname6.if_name to configure any Ipv6 interfaces on the system.

ifconfigThe ifconfig command is used to bind the IP address, host name, net mask, broadcast address, and other network configuration parameters to a particular network interface. The ifconfig command is run at boot time by the startup scripts called by the init process. Unfortunately, every vendor has added its own options to the ifconfig command, with the list of options growing daily. This fact makes it almost impossible to tabulate all options available for every operating system environment.You can use the ifconfig command to examine and/or modify interface parameters while the system is up and running. When issued with the –a flag, ifconfig prints the configuration information for all interfaces. Note that IPv4 and IPv6 information is listed separately on dual-stack hosts. Because the implementation details may differ on various versions of UNIX, it is best to consult the ifconfig manual page on your system for more information on this command.

routeThe route command is used to add and manage static routing tables on the host.

Static routes are, as the name implies, routes that should not change very often. Many sites configure their systems to send all packets to the site/building/group router nearest the host’s location. The routers then decide how to deliver the data to the final destination. The route command allows the administrator to manually add a static route to this “default gateway” router. The generic call to the route command is as follows.

route [-f] keyword [type] destination gateway [metric]

SolarisTo configure the DHCP Server service under Solaris, the administrator should use the dhcpconfig command. The dhcpconfig command is a front end to the dhtadm and pntadm utilities that build and maintain DHCP configuration tables. The dhcpconfig command allows the administrator to configure DHCP and Boot Relay services (required for remote DHCP), or to unconfigure the DHCP service.The dhcpconfig command will guide the user through several questions, collecting the information necessary to set up DHCP on the server. Once the information is collected by dhcpconfig, it will invoke the dhtadm and pntadm commands to create the DHCP database files, and start the DHCP service.If this DHCP server were required to provide DHCP service for remote networks, the administrator would have to set up/configure the BOOTP Relay service. The DHCP registration requests are sent as broadcast packets. By default, routers will not forward broadcast packets to other networks. For the DHCP registration request packets to get to the server, a relay service has to forward them through the router.

Network Monitoring and TroubleshootingAs with most computer operations, networks are bound to have problems. Troubleshooting networks can be a tedious process. One method of troubleshooting is to use monitoring tools that determine how the network is being used. In some cases, it may not be possible to monitor a network because physical connections may be damaged or gateways may be down. Another method of monitoring the network is to watch the console error messages generated by the machines connected to the network.

Console Error MessagesThe error messages sent to the system console provide you with a lot of information about the health of the system and the network. Unfortunately, many administrators do not pay attention to console messages (or worse yet, close the console window, or leave the console window iconized).Fortunately, UNIX provides the administrator with a simple facility for capturing all console messages in a single location. The UNIX kernel uses the syslog facility to log messages to the system console. However, syslog also allows these messages to be sent to remote hosts.

/etc/syslog.conf FileThe /etc/syslog.conf file controls the action of the syslog facility. The UNIX kernel defines several levels of message severity. Entries in the syslog.conf file configure the syslog facility to handle these different message categories. For example, a simple informational message may be ignored, whereas a system hardware error may be reported to the console with much fanfare.

Host Configuration• Network Monitoring• Although kernel syslog messages may provide some information about the health of the network,

it is some times necessary to more closely examine the network.

• Simple Network Management Protocol (SNMP)• A more sophisticated method of monitoring networks is to use a network management tool based

on the simple network management protocol (SNMP). • The SNMP package allows a network administration host to constantly monitor the network.

Information available to the SNMP software includes network utilization, host error counts, host packet counts, and routing information. SNMP allows you to determine normal usage of the net work and implement alarms to warn of impending problems.

• SNMP operates in a client/server mode. One machine on the network is designated as the SNMP network monitor station. It is configured to poll hosts on the local network in order to collect data into a central repository. The data may be made available to other packages in order to implement alarms, generate graphs of network utilization, and other off-line processing.

• The other hosts on the network are configured as SNMP clients. These hosts run a process that watches for polling requests from the network management station. When such a request is received, the SNMP agent code collects the data from the workstation’s kernel and forwards it to the management station.

Host Configuration• Configuring SNMP

– Under most operating systems, the default SNMP configuration is horribly insecure. For this reason, many sites disable the SNMP client code on their systems. If you must run SNMP, there are several things you should do in an attempt to protect the security of your systems.

– Change the public and private community strings. By default, the public string is public. Private community strings vary by vendor, but are usually easy to find. Access to the private string gives an intruder the capability to reconfigure your hosts/network equipment. Change these strings and protect them as you would the root password. The SNMP community strings are just as dangerous as a compromised root password!

– Block TCP and UDP ports 161, 162, and 1993 at your border routers. There should be no reason for someone outside your organization to access your site using SNMP.

– Keep current with patches. Watch for SNMP security advisories, and make sure your hosts are patched.

– If you generate OpenView or MRTG information for your network, do not allow it to be viewed without proper authentication. The data available from OpenView and/or MRTG packages often gives intruders important information about your network.

– With these rules in mind, the following sections briefly discuss how to configure the SNMP client on various operating systems.

Host Configuration• SNMP Under Solaris

– Under Solaris, the following four files are responsible for the configuration and startup of the SNMP package.

– ·   /etc/rc2.d/S76snmpdx: Startup script for the snmp daemon.– ·   /etc/rc2.d/S77dmi: Startup script for the DMI processes that are part of the

snmp package.– ·   /etc/snmp/conf/snmpdx.acl: File containing a list of IP addresses allowed to

contact the SNMP daemon on this system. The default file contains comments that explain how to add the IP addresses, and community strings for each host allowed to contact the local SNMP daemon.

– ·   /etc/snmp/conf/snmpd.conf: Text configuration file for snmpd.– The administrator needs to edit the configuration file and set the read and write

community strings to something unique to the local site, as shown in the following example.

Host Configuration• SNMP Under Linux

– By default, most Linux installers no longer install the SNMP package. – To use SNMP, you must install the SNMP utilities from the distribution medium, or from

a downloaded RPM. – If you do run SNMP, you need to edit the /etc/snmp.conf file to set the runtime

parameters for the SNMP utilities.

• SNMP Under HPUX– Under HPUX, the following two files are responsible for the configuration and startup of

the SNMP package.– /usr/sbin/snmpd: Startup script for the snmp daemon– /etc/SnmpAgent.d/snmpd.conf: Text configuration file for snmpd – The snmpd.conf file allows the administrator to define several variables that control the

actions of the SNMP daemon.

Host Configuration• SNMP Under Windows

– Under Windows, the SNMP package is not installed by default. – To use the SNMP package under Windows the administrator must load the package

from the distribution medium. – This may be accomplished using the Add/Remove Programs control panel. – Click on the Add/Remove Windows Components button, select the Management

and Monitoring Tools option, and click on the Details button. – Next, select Simple Network Management Protocol, and click on OK.– Once the SNMP protocol has been installed, select Control Panel | Administrative

Tools | Services GUI to select the SNMP agent. – This will cause a pop-up window to appear. The pop-up window contains entries for

the configuration and management of the SNMP process

24.2. Configuring a Samba ServerThe default configuration file (/etc/samba/smb.conf) allows users to view their home directories as a Samba share. It also shares all printers configured for the system as Samba shared printers. In other words, you can attach a printer to the system and print to it from the Windows machines on your network.

24.2.1. Graphical Configuration. The Samba Server Configuration Tool is a graphical interface for managing Samba shares, users, and basic server settings. It modifies the configuration files in the /etc/samba/ directory. Any changes to these files not made using the application are preserved. To use this application, you must be running the X Window System, have root privileges, and have the redhat-config-samba RPM package installed. To start the Samba Server Configuration Tool from the desktop, go to the Main Menu Button (on the Panel) => System Settings => Server Settings => Samba or type the command redhat-config-samba at a shell prompt (for example, in an XTerm or a GNOME terminal).

Configuration Samba Server

24.2.1.1. Configuring Server SettingsThe first step in configuring a Samba server is to configure the basic settings for the server and a few security options. After starting the application, select Preferences => Server Settings from the pulldown menu.

Contd..

On the Basic tab, specify which workgroup the computer should be in as well as a brief description of the computer. They correspond to the workgroup and server string options in smb.conf.

Contd..

The Security tab contains the following options:

Authentication Mode — This corresponds to the security option. Select one of the following types of authentication.

ADS — The Samba server acts as a domain member in an Active Directory Domain (ADS) realm.

Domain — The Samba server relies on a Windows NT Primary or Backup Domain Controller to verify the user. The server passes the username and password to the Controller and waits for it to return.

The Encrypted Passwords option must be set to Yes if this is selected.Server — The Samba server tries to verify the username and password combination by passing them to another Samba server. If it can not, the server tries to verify using the user authentication mode.

Share — Samba users do not have to enter a username and password combination on a per Samba server basis. They are not prompted for a username and password until they try to connect to a specific shared directory from a Samba server.

User — (Default) Samba users must provide a valid username and password on a per Samba server basis. Select this option if you want the Windows Username option to work.

Contd..

Encrypt Passwords — This option must be enabled if the clients are connecting from a Windows 98, Windows NT 4.0 with Service Pack 3, or other more recent versions of Microsoft Windows. The passwords are transferred between the server and the client in an encrypted format instead of in as a plain-text word that can be intercepted. This corresponds to the encrypted passwords option. Guest Account — When users or guest users log into a Samba server, they must be mapped to a valid user on the server. Select one of the existing usernames on the system to be the guest Samba account. When guests logs in to the Samba server, they have the same privileges as this user. This corresponds to the guest account option.

Contd..

Managing Samba Users

The Samba Server Configuration Tool requires that an existing user account be active on the system acting as the Samba server before a Samba user can be added.

Adding a Share

Contd..