What’s Thin Client

Thin Client is reduce the size of a computer workstation that is used to these smaller To help in the difficult management and reduced maintenance. Thus enabling the concept of the Thin Client by reducing both the size and features of this type into the computer with the appropriate use This reduces the cost to the part. While the resource is disabled, large data storage media such as hard disk from the network. Then lift the burden of processing. Storage Services for Application – Operating system software. Software application. And control are to be included on a centralized server in a network called the Server Based Computing. This concept allows several benefits:

• Reduce costs of network hardware such as the school may use for your PC, a low – medium to receive donations.
• Reduce complexity of system management, including checks for viruses or hard disk in the backup of each machine.
• Reduce the need to perform at a network device such as a change to a repair upgrade install additional application software to users.
• Channel and reduce the chance of damage due to theft. In the case of a network-Thin Client are not allowed to install or use the data storage media Removable Media category or peripherals such as floppy disks. (File copy) printer port. (Information from the document does not print). Including anti theft devices such as recording expensive. Hard disk. Because no hard disk in the machine

To use the Thin Client is a projection that a reality will require a protocol. And service network combined with many. Respectively, we can experience the work. There are steps to boot the machine until the Thin Client users can use Apple system has the following applications.

• Started from a PC Thin Client start run BIOS of the machine will choose the boot device as defined by ??? set up within the BIOS. In the case of the boot to access the network will be divided into 3 characteristic is
        1. Boot with the software contained in ROM Boot LAN card LAN card on the circuit’s most Socket availability is prepared to use the memory chips installed into ROM. The internal memory, users will need to save this program for a boot device into the network.
        2. Boot protocol with PXE (Preboot Execution Environment), Build-in often comes with the motherboard BIOS version or new Flash in addition to the new LAN card.
        3. Bootable floppy disc by disc. By a simulation of the ROM Boot is the boot disc floppy disk. An easy way to test code before implementation of the ROM Boot ROM Burns into reality.
  In this step the program will go above the Broadcast network protocols with BOOTP (RFC951) request to TCP / IP Configuration by DHCP / BOOTP Server.
• DHCP / BOOTP Server will check the MAC Address of the Thin Client, and then send the relevant parameters of the config protocol TCP/ IP to the Client and Path and file name to use the kernel in the boot in the next step.
• When the Thin Client for various parameters associated with TCP / IP protocol to a TFTP (Trivial File Transfer Protocol) to download the file specified by the DHCP Server kernel into memory. And start working with this kernel.

 Protocols and services used

To use the Thin Client is a projection that a reality will require a protocol. And service network combined with many. Respectively, we can experience the work. There are steps to boot the machine until the Thin Client users can use Apple system has the following applications.

• Started from a PC Thin Client start run BIOS of the machine will choose the boot device as defined by ??? set up within the BIOS. In the case of the boot to access the network will be divided into 3 characteristic is
       1. Boot with the software contained in ROM Boot LAN card LAN card on the circuit’s most empty socket is prepared to use the memory chips installed into ROM. The internal memory, users will need to save this program for a boot device into the network.
       2. Boot protocol with PXE (Preboot Execution Environment), Build-in often comes with the motherboard BIOS version or new Flash in addition to the new LAN card. 
  Bootable floppy disc by disc. By a simulation of the ROM Boot is the boot disc floppy disk. An easy way to test code before implementation of the ROM Boot ROM Burns into reality. 
  In this step the program will go above the Broadcast network protocols with BOOTP (RFC951) request to TCP / IP Configuration by DHCP / BOOTP Server.
• DHCP / BOOTP Server will check the MAC Address of the Thin Client, and then send the relevant parameters of the config protocol TCP / IP to the Client and Path and file name to use the kernel in the boot in the next step.
• When the Thin Client for various parameters associated with TCP / IP protocol to a TFTP (Trivial File Transfer Protocol) to download the file specified by the DHCP Server kernel into memory. And start working with this kernel.
• Kernel will restart the operation. In early work within the RAM Disk and then run before init script to work as scheduled to run on various devices including the search module loads required. Modules specifically for the Power Networking
• The Thin Client will Broadcast as DHCP Client again but this time will provide important information about the mount to NFS Server (Network File Service) to rely on a shared disk server after a Root File System mount. script successfully switch to the Thin Client will use Root File System from a RAM Disk Root File System from NFS mount service through making this Thin Client software can use various shared nucleus from a NFS Server. ) so administrators can set the properties of the Thin Client from a central mechanism through which this
• The kernel will create a File System to other systems more completely. Then, to enter Run Level (mode of the operating system) as an administrator appointed. This makes the work of the Client into a running mode Text Mode to Graphical Mode or as needed. If you use a Text Mode operation ends with a mark Lampf and waiting for user command-command command line.
• If that is the case administrator assigned to the Thin Client starts a Graphical Mode start_x script will continue running the Probe Card will display and run the software suite that serves as Xfree86 X Window protocol and then use Network X Protocol connection. into the X Server and Display Manager login to access graphics.

Config systems with Linux Thin Clients.

Thin Client System is currently in many camps. Embedded type or from the Internet is called the Network Computer is a type of software solution that runs under Windows operating systems, Linux and Solaris for the love of a free software / open source. Projection is interesting to use as well. This project called Linux Terminal Server Project that stands called LTSP.

LTSP is a project developed to enhance the Terminal Server for Linux Server (Discovery TRIPOLI, BUSINESS-any)-based network features that are already available on every Linux server Discovery Golf Business applications that are DHCP Server, DNS Server, TFTP Server,. NFS Server and X Server site by a group of developers that this projection. http://www.ltsp.org. Which will document Programs to download files also Mailing List Service for advice. Exchange experiences with each other.

To understand more Before starting to build this system. Should note that the picture together before the many small parts to be perfectly prepared and will be more successful operation.

1. Check your PC to use a Thin Client LAN cards and cards that show G-V chips used in any version. Boot Loader software and prepare for a LAN card.
2. Prepare a Linux server. Authors choose to use Red Hat Linux 9.0 Professional installation and config of network-ready. 
3. Download the software that need config LTSP Linux Terminal Server as a server feature. 
4. Installation of software modifications LTSP config files. And start the services required to use the service with DHCP, TFTP, NFS is important. 
5. Restart PC Thin Client to test the functionality. 

Prepare PC to Thin Client. 

PC is used to select the Thin Client is that we should know the details of hardware, especially LAN cards. Video display card with GE Fanuc. The purposes of the Thin Client does not need a hard drive installed on a machine like the author is using a Celeron 433MHz RAM 128MB chip S3 Trio3D display and use the LAN card chip Intel EtherExpress Pro 100 (On board) chip’s data show. Results will be used in the process of downloading the version of X Server to be decided at a graphical display. The LAN card’s chip. We will have to download from the site EtherBoot http://www.rom-o-matic.net. The development of this program has created programs to help compile the program use very comfortable sheer Just choose the version of the chip side to the program website will create a program to download the image immediately.

Image files that are available with many variations. For example, the ROM Boot to Burn down the LAN card will need to select a file. Zrom for image files to create a boot disk boot disc Thin Client must select a file format. Zdsk when. ago to bring this file into a file on Linux server. that the disk is used as a boot disc Thin Client already entered, type the following command. Will create a boot disc for the version we downloaded LAN card (LAN card is in the example of Intel being tested)

# cat eb-5.2.4-eepro100.zdsk > /dev/fd0

When a disc and then to bring it to a Thin Client boot without LAN cable plugs. Or make sure no one computer is running a DHCP Server in the text that appears on the display of Thin Client will let us know the number of Ethernet Address is the LAN card. The figures show a total of 12 base 16 digits eg 00:06:29:1 E: BA: 6B (MAC Address) is to be noted in step a server config.

Prepare Linux server.

I choose to use the Red Hat Linux 9.0 installation EveryThing like something that should ever have to make sure:

1. Config Network Interface
2. Package should be related to DHCP, NFS, TFTP is at least
3. Components of the X Window and GNOME Desktop allows seamless.
4. Do not open until about a firewall make sure the system works perfect.
5. To fabricate the supports, de Thai Should be set to Thai Language.
6. Do not forget to add Iosesars the test and set a password. 
7. Should open telnet or http server in a preliminary experiment. 

As an example in this article requires a server with the IP number 192.168.0.30 Hostname icute.rj45patchcord.com. And will require a number of Thin Client IP is 192.168.0.31 Hostname ws031.rj45patchcord.com.

Download the software package of LTSP.

Web site http://www.ltsp.org. LTSP is a software to download 3 format with the RPM package for Linux Red Hat, Mandrake package. Deb files for Debian and Tarball (tgz) the source code used to compile. Authors choose to use Red Hat Linux as a Terminal Server is selected download a RPM package downloads by selecting specific files to use only the fact that in this version will use 3 LTSP number 6 overall file size approximately 36 MB. 
Thin Client device used for display cards differ from this will need to download the appropriate package for chips that use.

Installation package and a simple config Terminal Server.

After the file package to download all the Linux server and then use the command rpm install all packages. As an example command: 

# rpm -ivh *.rpm

After installing all packages. The directories is occurring in 2 / opt / ltsp and / tftpboot / lts. 
Go to / opt / ltsp / templates. Then run the script. Figure 5 ltsp_initialize the script will ask to verify the config to Figure 6 and opportunities that we choose not to have some config. This means that when A accepts all the config as suggested. The Thin Client is supported from both the Text Mode and Graphic Mode shape.

To copy the files. / etc / dhcpd.conf.example. A new file name. / etc / dhcpd.conf. Then open this file, edit. The example in Figure 8, the config must be cost Ethernet Address of the LAN card used in the Thin Client to set the config file. Thin Client network for the next in the same config. The only section of ws031 add edit name but a host ws032 number of IP and Ethernet Address is the host. After editing the file config details in order to save the DHCP Server and then start with the command service dhcpd restart chkconfig dhcpd on and respectively.

In communication between the Linux Terminal Server with Thin Client will focus on the Name Resolution is so much to ensure that the file / etc / hosts is configured correctly. Here is a list of network servers and clients must be kept full all the samples.

However, under the environment that may not be ready in the Domain Name Service (DNS) may affect the work of Log File Management System or syslogd program which we will set the config of the Thin Client network to send all the work will appear in the Log File and the server. To prevent such problems should edit the config program SysLogd of servers by a small laundry. Then, do not forget to restart the service.

Files config  that are important to the work of the Thin Client is the file / opt/ltsp/i386/etc/lts.conf. This work will define the basis of the Thin Client for each IP such as number of servers. SWAP memory size of the parameter values directing the work of the X Server.

Once you have everything on the server side config. Should perform a restart, the server again to ensure everything will usually start at any time open systems. Follow the instructions.

           # chkconfig nfs on
          # chkconfig tftp on
         # chkconfig dhcpd on
        # reboot

The test machine boot Thin Client.

When Thin Client with a bootable floppy disc Discovery detectors prepared. Machine will stop at a prompt. To test ease of use, may use the command ifconfig, ping or telnet, or if any need to use it in graphics mode, just type the command

# /tmp/start_ws

Thin Client device to enter our page of the GNOME login screen name and password can use the Iosesars of servers. Iosesars can use Application-existing in a server. If the server can use the Internet at own will make a Thin Client using these as the Internet. For storage of each Iosesars Home Directory of Iosesars is that the GNOME Desktop own I tend to be displayed on the Home Directory is de-textiles.

For various config-Iosesars to customize your own editing. Will be stored under each of the Home Directory (Home Directory, which is space on the server) so that it will move Iosesars chest ?? on Thin Client in any environment will have to show the same track. use. Whether it’s textiles, the de (GNOME or KDE) pictures wallpapers beautiful theme or other configuration programs are included in the Proxy Server set cookies to remember your password from the site visits.

Linux Terminal Server Project is a Thin Client system that may trigger that finished. It does not use difficult. Services can help reduce the complicated to the breakup have one centralized set of the concert, the rarely-important Kleiner (Thin Client), but one thing is to accept barter and deciding this is the system. servers require a thick (Thick Server) for a high image Sitt Co. because every pro that runs from the Thin Client will be processed on the server side a majority. Including volume packet data in a high-volume network is also one thing to consider. Here is another solution built on the properties of the various benefits of the operating system called “Linux”