When the creation process finishes and the Complete! This procedure involves using the dd command line tool to write the installation image to a USB flash drive. Note that some steps involve use of the sudo command, which is only available when logged in with an administrator account that requires a password.
All data on the USB flash drive will be deleted by this procedure. The disks are numbered starting at zero 0. In the following example, it is disk2 :. You can also compare these values to those in the flash drive's information panel; right-click on the drive icon and select Get Info. Use the diskutil unmountDisk command to unmount the flash drive's filesystem volumes:.
When you do this, the icon for the flash drive disappears from your desktop. If it does not, you might have identified the wrong disk. If you attempt to unmount the system disk accidentally, you get a failed to unmount error. Use the dd command as a parameter of the sudo command to write the ISO image to the flash drive:. Example 3. If you do not make a selection within 60 seconds, the default boot option highlighted in white is run.
To select a different option, use the arrow keys on your keyboard to make your selection and press the Enter key. Use this option to install Red Hat Enterprise Linux using the graphical installation program. For more information, see Performing a quick install with GUI.
Use this option to check the integrity of the installation media. For more information, see Verifying a boot media. Use this option to resolve various installation issues. Press Enter to display its contents. Use this option to install Red Hat Enterprise Linux in graphical mode even if the installation program is unable to load the correct driver for your video card. If your screen is distorted when using the Install Red Hat Enterprise Linux 8 option, restart your system and use this option.
For more information, see Cannot boot into graphical installation. Use this option to repair any issues that prevent you from booting.
For more information, see Using a rescue mode. Use this option to run a memory test on your system. For more information, see memtest Use this option to boot the system from the first installed disk. If you booted this disk accidentally, use this option to boot from the hard disk immediately without starting the installation program. Boot options are appended to the boot command line and multiple options must be separated by a single space. Boot options that are specific to the installation program always start with inst.
This section contains information about the different ways that you can edit boot options from the boot menu. Now you are ready to copy the installation media to the USB drive. Because you are creating a custom boot disk, you will need to extract the Anaconda installer files vmlinuz and initrd.
The vmlinuz and initrd. However, you may want to create a tree directory structure to help organize the files. This will allow you to store the files from multiple Linux versions without having to rename them. The files are relatively small, and saving a copy will prevent you from having to extract the files again in the future.
For example:. RHEL 5. The Anaconda installer will boot but when it goes to read the installation media from the ISO it will complain you have the wrong version and abort. The file that governs the operation of the boot menu is syslinux. A sample file is provided in Appendix A. The syntax should be fairly self-explanatory. This points out an important caveat: it may take a bit of experimentation to determine how the USB drive is enumerated on a given system.
And obviously, the system you used to build the USB drive may have no bearing on the system on which you intend to install Linux. If in doubt, run through a manual install first to help identify your devices, then edit your syslinux. You can set up multiple installation tasks for different versions of Linux or for different variations of the install method. You can create an unattended installation task using Red Hat Kickstart. For a more detailed description of kickstart see: Kickstart. Remember, because you have the ability to set up multiple installation tasks in syslinux.
So just because you have a kickstart file on the drive does not mean you have to use it in every case. In general, installing from USB drive is not much different than installing from any other media type. In this section we will address the handful of known issues specific to installing from USB drive, and review some of the common problems encountered when trying to get a machine to boot from USB.
Otherwise, you may have to enter the BIOS setup screen to change the boot order. This is very useful for debugging as it allows you to try something different without having to edit your syslinux. After a moment, Anconda will try to locate the install media ISO images as specified on the kernel command line above or in the kickstart file.
If this is not specified, or for whatever reason Anaconda cannot find the files, it will prompt you for the location. This is a common point of failure when trying to automate the install as it depends on a correct reference to the USB device, which may vary from system to system. As described in section 2. Once the install media is located you will see the following message at the bottom of the screen:. Note: When using Kickstart for unattended install , by default you will not see any of the Anaconda screens that you would during a manual install, unless the installer cannot find the necessary response in the kickstart file and needs to prompt you.
Excessive input for example, clicking the mouse repeatedly during the boot sequence can cause the installer to ignore keyboard input later in the installation process. Occasionally, some hardware components require a driver update during the installation. A driver update adds support for hardware that is not otherwise supported by the installation program.
Booting from Physical Media. Booting the Installation from Physical Media Disconnect any drives which you do not need for the installation.
See Section 5. Power on your computer system. For more information, see the documentation that came with your system.
0コメント