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  • Installing RHEL 6 on a Clean Disk Drive - Techotopia
    a dialog will appear seeking confirmation Timezone and the Root Password Subsequent screens will request information about Timezone and the root password of the system On the Timezone screen make a selection corresponding to your geographical location The option is also provided to use UTC which automatically adjusts the time to account for daylight savings time If the computer on which RHEL is being installed also runs another operating system which already uses UTC such as Windows leave this option unselected On the next screen enter a password for the root account on the system The root or super user account is a special user that has administrative privileges on the system Whilst you will generally use your own account to log into the system you will need to gain root privileges in order to configure the system and to perform other administrative tasks The installer will subsequently move on to the disk partitioning screen Partitioning a Disk for RHEL 6 When you reach the disk partitioning phase of the installation the installer will present a screen similar to the one illustrated in the following figure google RHEL6BOX google A number of options are provided for allocating space for the installation of Fedora Use All Space The entire disk drive will be assigned to the RHEL 6 operating system installation Any pre existing partitions together with any existing operating systems and associated data files contained therein will be deleted to make room for RHEL This option should only be used if you are absolutely sure you no longer need anything that is currently stored on that disk or have already backed up all user files Replace existing Linux System s If the drive was previously configured to support a Windows Linux dual boot environment or was devoted entirely to another Linux installation this option may be selected to instruct the installer to delete the pre existing Linux partition and replace it with RHEL 6 Once again it is important to backup any user data that may still be needed Shrink Current system Allows an existing partition to be reduced in size to make room on the drive for the RHEL 6 installation More details on this option are provided in a later chapter entitled Installing RHEL 6 with Windows in Dual Boot Environment Use Free Space If the current partitions on the drive do not take up the entire disk space available any unallocated space may be assigned to the RHEL installation using this option Create Custom Layout When selected this option displays the disk partitioning tool allowing each partition on the disk to be manually configured Unless you have experience with low level disk partitioning this option is not recommended On this screen make a selection based on your requirements If for example the entire disk is to be used for RHEL 6 select the Use All Space option In order to implement a dual boot configuration refer to Installing RHEL 6 with Windows in Dual Boot Environment For

    Original URL path: http://www.techotopia.com/index.php/Installing_RHEL_6_on_a_Clean_Disk_Drive (2016-02-13)
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  • Performing an RHEL 6 Network Installation - Techotopia
    target system This is achieved using the mount loopback interface mount o loop rhel6 image iso path to mount point In this case path to mount point is replaced by the full path to the location where the RHEL 6 installation image is to be mounted such that it can be accessed via the chosen network installation method For example in the case of an HTTP based installation the chosen mount point might be var www html rhel6 Note that the specified mount point directory must already exist before executing this command Obtaining a Network Boot Image Once the remote server is configured with a copy of the RHEL 6 installation image the next step is to plan how the installation process will be initiated on the target system Clearly we will still need to be able to boot from something locally to start the installation The best option is to download the Network Install and Recovery Disc image from Red Hat Network software downloads page This image is approximately 220 Mb in size and may be burned to a CDROM DVD or USB flash drive Writing the Boot Image to a USB Flash Drive Once the network installation ISO image has been downloaded from the Red Hat Network web site it may be burned onto a USB flash drive and then used to boot the system on which the network installation is to be performed This task is best performed on another Linux system using the dd command to directly write the ISO image to the flash drive Begin by inserting the USB flash drive into an appropriate port on the Linux system and wait for the system to detect the device and mount it Identify the device name assigned to the drive using the mount command in a terminal window and then unmount the media Assuming for the sake of an example that the mount command indicated the USB drive was assigned to device file dev sdb the following command would be used to write the ISO image to the drive dd if path to iso image of dev sdb Once the image has been written to the drive take it to the target system modify the BIOS boot settings to ensure that the system will boot from a USB device prior to any other storage devices and reboot the system Configuring the Network Installation When the network installer image has booted press the Esc key on the boot menu screen enter the following command at the boot prompt and press the enter key linux askmethod A sequence of screens will subsequently appear providing the opportunity to select a language and keyboard type Once these settings have been defined a screen will appear requesting the location of the installation media google RHEL6BOX google Depending on the method by which the installation images are being served by the remote system select either NFS Directory or in the case of an FTP or HTTP based server URL For the purposes

    Original URL path: http://www.techotopia.com/index.php/Performing_an_RHEL_6_Network_Installation (2016-02-13)
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  • Installing RHEL 6 with Windows in Dual Boot Environment - Techotopia
    the Windows partition In practice you will want to leave space on your Windows system for storing future data so it is recommended that you do not shrink the partition to the full extent available For the purposes of this example we will shrink the partition to 6000MB Before performing the live resize it is best to run through a simulation in order to identify any problems before permanent changes are made To do this run ntfsresize with the no action option root livecd ntfsresize no action b size 6000M dev hda1 ntfsresize v1 13 1 libntfs 9 0 0 Device name dev hda1 NTFS volume version 3 1 Cluster size 4096 bytes Current volume size 21459722752 bytes 21460 MB Current device size 21459723264 bytes 21460 MB New volume size 5999993344 bytes 6000 MB Checking filesystem consistency 100 00 percent completed Accounting clusters Space in use 2047 MB 9 5 Collecting resizing constraints Needed relocations 21547 89 MB Schedule chkdsk for NTFS consistency check at Windows boot time Resetting LogFile this might take a while Relocating needed data 100 00 percent completed Updating BadClust file Updating Bitmap file Updating Boot record The read only test run ended successfully Assuming the read only test runs successfully the actual resize can be performed by running the same command but this time without the no action option root livecd ntfsresize b size 6000M dev hda1 ntfsresize v1 13 1 libntfs 9 0 0 Device name dev hda1 NTFS volume version 3 1 Cluster size 4096 bytes Current volume size 21459722752 bytes 21460 MB Current device size 21459723264 bytes 21460 MB New volume size 5999993344 bytes 6000 MB Checking filesystem consistency 100 00 percent completed Accounting clusters Space in use 2047 MB 9 5 Collecting resizing constraints Needed relocations 21547 89 MB WARNING Every sanity check passed and only the dangerous operations left Make sure that important data has been backed up Power outage or computer crash may result major data loss Are you sure you want to proceed y n y Schedule chkdsk for NTFS consistency check at Windows boot time Resetting LogFile this might take a while Relocating needed data 100 00 percent completed Updating BadClust file Updating Bitmap file Updating Boot record Syncing device Successfully resized NTFS on device dev hda1 You can go on to shrink the device for example with Linux fdisk IMPORTANT When recreating the partition make sure that you 1 create it at the same disk sector use sector as the unit 2 create it with the same partition type usually 7 HPFS NTFS 3 do not make it smaller than the new NTFS filesystem size 4 set the bootable flag for the partition if it existed before Otherwise you won t be able to access NTFS or can t boot from the disk If you make a mistake and don t have a partition table backup then you can recover the partition table by TestDisk or Parted s rescue mode At this point we have reduced the size of the NTFS partition but the partition does not yet know we have done so If for example we use fdisk to tell us about the partition the partition table information still indicates the original size root livecd fdisk l Disk dev hda 21 4 GB 21474836480 bytes 255 heads 63 sectors track 2610 cylinders Units cylinders of 16065 512 8225280 bytes Device Boot Start End Blocks Id System dev hda1 1 2609 20956761 7 HPFS NTFS In order to address this we will have to delete the partition information and then recreate it with the new size information Before doing so make a note of the Start and Id values for the partition provided by the above fdisk command yours will possibly differ from the example and we will need these when we recreate the partition Begin by starting fdisk with the name of the disk drive on which we are going to modify the partition table information root livecd fdisk dev hda At the command prompt delete the partition for the example this is partition 1 but may be different on your system Command m for help d Selected partition 1 Next we need to recreate the partition with the new size information keeping in mind that we reduced the partition to 6000MB Command m for help n Command action e extended p primary partition 1 4 p Partition number 1 4 1 First cylinder 1 2610 default 1 1 Last cylinder or size or sizeM or sizeK 1 2610 default 2610 6000M Next the Id of the partition needs to set to the original value as indicated by the fdisk l command in this case 7 to indicate the partition uses the Windows NTFS format Command m for help t Selected partition 1 Hex code type L to list codes 7 Changed system type of partition 1 to 7 HPFS NTFS Finally we need to make sure the partition is still bootable Command m for help p Disk dev hda 21 4 GB 21474836480 bytes 255 heads 63 sectors track 2610 cylinders Units cylinders of 16065 512 8225280 bytes Device Boot Start End Blocks Id System dev hda1 1 730 5863693 7 HPFS NTFS If the Boot column does not contain an asterisk then we need to make the partition bootable before we write the new configuration disk Command m for help a Partition number 1 4 1 Once again it is prudent to check the settings before proceeding Command m for help p Disk dev hda 21 4 GB 21474836480 bytes 255 heads 63 sectors track 2610 cylinders Units cylinders of 16065 512 8225280 bytes Device Boot Start End Blocks Id System dev hda1 1 730 5863693 7 HPFS NTFS If all is well write the new partition information to disk Command m for help w The partition table has been altered Calling ioctl to re read partition table The resize is now complete and you can reboot the system If you check the

    Original URL path: http://www.techotopia.com/index.php/Installing_RHEL_6_with_Windows_in_Dual_Boot_Environment (2016-02-13)
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  • Allocating a Windows Disk Partition to RHEL 6 - Techotopia
    sda 21 5 GB 21474836480 bytes 255 heads 63 sectors track 2610 cylinders total 41943040 sectors Units sectors of 1 512 512 bytes Sector size logical physical 512 bytes 512 bytes I O size minimum optimal 512 bytes 512 bytes Disk identifier 0x4eb978f9 Device Boot Start End Blocks Id System dev sda1 2048 206847 102400 7 HPFS NTFS dev sda2 206848 22489087 11141120 7 HPFS NTFS dev sda3 22489088 23513087 512000 83 Linux dev sda4 23513088 41943039 9214976 5 Extended dev sda5 23515136 41943039 9213952 8e Linux LVM Make a note of the start and end addresses of the partition we will be deleting dev sda2 in this instance At the command prompt delete the Windows partition which is partition 2 on our example system Command m for help d Partition number 1 5 2 Command m for help Now that we have deleted the Windows partition we now need to create the new RHEL partition in the vacated disk space The partition number must match the number of the partition removed in this case 2 and is going to be a primary partition It will also be necessary to enter the Start and End sectors of the partition exactly as reported for the old partition fdisk will typically offer the correct values by default though it is wise to double check Command m for help n Command action l logical 5 or over p primary partition 1 4 p Selected partition 2 First sector 206848 41943039 default 206848 Using default value 206848 Last sector sectors or size K M G 206848 22489087 default 22489087 Using default value 22489087 Having made these changes the next step is to check that the settings are correct Command m for help p Disk dev sda 21 5 GB 21474836480 bytes 255 heads 63 sectors track 2610 cylinders total 41943040 sectors Units sectors of 1 512 512 bytes Sector size logical physical 512 bytes 512 bytes I O size minimum optimal 512 bytes 512 bytes Disk identifier 0x4eb978f9 Device Boot Start End Blocks Id System dev sda1 2048 206847 102400 7 HPFS NTFS dev sda2 206848 22489087 11141120 83 Linux dev sda3 22489088 23513087 512000 83 Linux dev sda4 23513088 41943039 9214976 5 Extended dev sda5 23515136 41943039 9213952 8e Linux LVM To commit the changes we now need to write the new partition information to disk and quit from the fdisk tool Command m for help w The partition table has been altered Calling ioctl to re read partition table WARNING Re reading the partition table failed with error 16 Device or resource busy The kernel still uses the old table The new table will be used at the next reboot or after you run partprobe 8 or kpartx 8 Syncing disks If you see a warning similar to the one indicated in the above output you will need to reboot your RHEL 6 system to be sure the new partition table information is picked up by the system kernel before proceeding Formatting

    Original URL path: http://www.techotopia.com/index.php/Allocating_a_Windows_Disk_Partition_to_RHEL_6 (2016-02-13)
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  • Logging into the RHEL 6 GNOME Desktop - Techotopia
    RHEL to the next google RHEL6BOX google This screen has a number of options and text fields that give the user some level of control over what happens next User Icons For each user with an account on the system an icon will appear next to their login name Clicking on this icon will begin the login process for that user and prompt for a password If the user is not listed for example the root user is not listed the Other button may be pressed to manually enter the user name Password This input field only appears after a user name has been selected from the list or typed into the Username field Once the password has been entered press the Enter key to initiate the login process The bottom of the screen contains a number of buttons The first button allows accessibility options such as screen reader magnification and keyboard settings to be configured Next is a power switch When pressed the button displays a menu containing the following power related options Restart Reboots the system If this option is selected the system will display a confirmation window verifying the system is to be restarted before doing so Shut Down Shuts the system down to its powered off state As with the Reboot option confirmation will be sought before the shutdown proceeds After a user has been selected the status bar along the bottom of the screen will change to display language and keyboard layout options Once valid login credentials have been provided RHEL will initiate the login process and present the desktop As with the login screen the appearance of the desktop changes between RHEL releases so do not be concerned if your desktop does not appear exactly as illustrated below Assuming you have now logged successfully

    Original URL path: http://www.techotopia.com/index.php/Logging_into_the_RHEL_6_GNOME_Desktop (2016-02-13)
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  • Configuring RHEL 6 GNOME Screen Resolution and Multiple Monitors - Techotopia
    in configuring monitors involves setting the optimal screen resolution for both the monitor and the user RHEL 6 will generally do a good job of configuring these settings during installation but it can sometimes be necessary to modify these settings to obtain optimal results If RHEL has correctly identified your display and graphics cards then it should be possible to increase the resolution to any value up to the maximum supported by the hardware using the Display Preferences screen accessed via the System Preferences Display menu option Using the Resolution menu select the desired screen resolution up to the maximum support by the hardware and click on the Apply button to commit the change Changing Display Orientation google RHEL6BOX google The Display Preferences dialog also provides the option to change the orientation of the desktop to match the orientation of the monitor This is achieved using the Rotation control This setting can be used to orient the desktop such that it will appear the right way up if the monitor is physically upside down or on its left or right side If you are feeling brave try changing the setting to upside down mode while your monitor is still the right way up Once the desktop is upside down revert to the Normal setting keeping in mind that the mouse will move up when you move it down left when you move it right and so on Configuring Multiple Monitors RHEL 6 supports multiple monitors connected to a single system allowing the desktop environment to be spread over more than one screen Multiple monitors are configured once again using the Display Settings tool which may be accessed from the Desktop System Administration Display menu option If the system fails to detect an additional monitor click on the Detect Monitors button

    Original URL path: http://www.techotopia.com/index.php/Configuring_RHEL_6_GNOME_Screen_Resolution_and_Multiple_Monitors (2016-02-13)
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  • A Guided Tour of the RHEL 6 GNOME Desktop - Techotopia
    Create Folder Creates a new folder on the desktop A new folder icon appears on the desktop with a field provided for the user to enter a folder name The folder is physically located in the Desktop folder of the user s home directory Create Launcher Allows an icon to be placed on the desktop which when double clicked launches a specified application Another way to add application launchers to the desktop is to find them in the menu systems at the top of the screen right click on them and select Add this launcher to desktop Create Document Creates a new document on the desktop the resulting file is physically located in the Desktop folder of the current user s home directory Open in Terminal Launches a terminal window containing a shell command prompt where commands may be entered and executed The current working directory of the shell within the terminal is set to the Desktop subdirectory of the user s home folder Clean Up by Name Sorts and organizes the desktop icons in alphabetical order Keep Aligned A toggle setting which dictates whether icons should be neatly aligned on the desktop or allowed to be placed arbitrarily around the desktop Change Desktop Background Allows a different background image to be specified Right clicking on an icon produces the following menu allowing tasks to be performed on the selected item The Desktop Panels The bars across the top and bottom of the desktop are called panels Both the content and position of these panels can be configured a topic which is covered in detail in Configuring the RHEL 6 GNOME Desktop Panels By default the top panel appears as follows The Application menu provides access to the applications installed in the system The Places menu provides a list of locations which when selected are opened in file browser windows Available locations include devices such as disk or CD DVD Drives the current user s home folder and other systems on the network The System menu provides options for configuring the system and desktop environment including factors such as desktop theme and screen resolution The icons next to the system menu provide quick access to common applications and tools The default icons will depend on the packages installed such as Firefox the Evolution email client and the OpenOffice office productivity tools but may be configured to add additional launchers for tools or applications you find you use regularly The right hand side of the panel includes the current time a volume control and a network status indicator To establish a network connection access a variety of configuration options by clicking with the left and right mouse buttons on the icon Also present on laptop based installations is an icon indicating current power status A variety of other status icons will appear in this section from time to time Typically hovering over or clicking on the status icon will display a brief description of the icon s purpose For example two

    Original URL path: http://www.techotopia.com/index.php/A_Guided_Tour_of_the_RHEL_6_GNOME_Desktop (2016-02-13)
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  • Configuring the RHEL 6 GNOME Desktop Background - Techotopia
    either by clicking with the right hand mouse button on the current desktop background and selecting Change Desktop Background selecting the Administration Preferences Appearance menu option and selecting the Background tab or clicking with the right hand mouse button on an image in the web browser and selecting Set As Desktop Background from the resulting popup menu The latter method allows you find images from one of the many web sites that provide them and quickly make one of them your background Regardless of which method you use the Desktop Background Preferences dialog will appear as illustrated in the following figure google RHEL6BOX google Selecting a Background from the Wallpaper List The background preferences dialog provides a list of pre installed wallpaper background images from which to choose Those images that are shown stacked are slideshows As each example is selected the background will automatically change to reflect the new selection Additional images may be added to the gallery by clicking on the Add button and navigating to the image file The Style menu provides a range of options for handling images that do not precisely match the screen dimensions Choices include zooming tiling scaling and fitting Creating a Solid or Graded Background If you prefer a background consisting of a solid color simply select the blank option option located at the top of the gallery list make sure that Solid Color is selected next to Colors and click on the color box to select a color The background can also be created by specifying a color gradient transition from one color to another The gradient may be horizontal or vertical With the blank wallpaper option selected change the Desktop Color menu to Vertical or Horizontal Gradient Using the two color boxes located to the right of the menu specify

    Original URL path: http://www.techotopia.com/index.php/Configuring_the_RHEL_6_GNOME_Desktop_Background (2016-02-13)
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