In this case, I have chosen to assign a memory capacity of MB. Then allocate some hard disk space for your virtual machine. In this example, I have chosen to assign On the first screen after powering on the VM , the following options will be printed on the screen.
Thereafter you will observe some boot messages on the screen as RHEL 8 boots up. Once the RHEL 8 is done with the booting process, the window below will prompt you to select the installation language.
A summary of all the critical components that need to be configured will be displayed as shown. Ensure you click on every one of them and tweak the settings according to your preferences.
In this case, I have chosen to go with the Workstation option which is quite okay for a desktop PC. For a production server, however, you may be required to manually partition the hard drive to suit your preferences.
But while at it, you will be required to provide a root password and create a new user. Once everything is set, the installer will begin to install RHEL 8. The installation process ensures that all the system packages and the grub bootloader are installed.
At this point, it is safe to remove your installation media, or in this case, unmount the ISO image file. At this point, accepting the license agreement is what is crucial. The latter can be done later once we are done with the installation of the system. Log in with your username and password.
When you try updating your system packages on the terminal, you will encounter the error below. This implies that your system has not yet been registered. Thereafter, execute the command below to enroll your RHEL system to a subscription.
If everything went according to plan, you should receive the notification as shown. The trial period for RHEL 8 developer subscription lapses after 1 year. You can then make any changes required to your system. If you want to proceed with this step choose 'Continue'. You can also choose to mount your file systems read-only instead of read-write by choosing 'Read-only'. If for some reason this process fails you can choose 'Skip' and this step will be skipped and you will go directly to a command shell.
If it fails to mount a partition, it notifies you. If you select Skip , your file system is not mounted. Choose Skip if you think your file system is corrupted.
If you selected Continue to mount your partitions automatically and they were mounted successfully, you are in single-user mode. Even if your file system is mounted, the default root partition while in rescue mode is a temporary root partition, not the root partition of the file system used during normal user mode runlevel 3 or 5.
If you selected to mount your file system and it mounted successfully, you can change the root partition of the rescue mode environment to the root partition of your file system by executing the following command:. To exit the chroot environment, type exit to return to the prompt. If the partition is of type ext2 , replace ext3 with ext2. When things go wrong, there are ways to fix problems.
However, these methods require that you understand the system well. This chapter describes how to boot into rescue mode, single-user mode, and emergency mode, where you can use your own knowledge to repair the system. Rescue Mode. Common Problems. You might need to boot into one of these recovery modes for any of the following reasons:.
You are unable to boot normally into Red Hat Enterprise Linux runlevel 3 or 5. You are having hardware or software problems, and you want to get a few important files off of your system's hard drive. This problem is often caused by the installation of another operating system after you have installed Red Hat Enterprise Linux.
Some other operating systems assume that you have no other operating system s on your computer. If the boot loader is overwritten in this manner, you cannot boot Red Hat Enterprise Linux unless you can get into rescue mode and reconfigure the boot loader. Another common problem occurs when using a partitioning tool to resize a partition or create a new partition from free space after installation, and it changes the order of your partitions. For instructions on how to reinstall the GRUB boot loader from a rescue environment, refer to Section This category includes a wide variety of different situations.
Two examples include failing hard drives and specifying an invalid root device or kernel in the boot loader configuration file. If either of these occur, you might not be able to reboot into Red Hat Enterprise Linux. However, if you boot into one of the system recovery modes, you might be able to resolve the problem or at least get copies of your most important files. Root Password. What can you do if you forget your root password? To reset it to a different password, boot into rescue mode or single-user mode, and use the passwd command to reset the root password.
Booting into Rescue Mode. Rescue mode provides the ability to boot a small Red Hat Enterprise Linux environment entirely from CD-ROM, or some other boot method, instead of the system's hard drive. As the name implies, rescue mode is provided to rescue you from something. During normal operation, your Red Hat Enterprise Linux system uses files located on your system's hard drive to do everything — run programs, store your files, and more. However, there may be times when you are unable to get Red Hat Enterprise Linux running completely enough to access files on your system's hard drive.
Using rescue mode, you can access the files stored on your system's hard drive, even if you cannot actually run Red Hat Enterprise Linux from that hard drive.
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