Mastering Red Hat Enterprise Linux 3

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Network-based installations are faster and can be done on numerous systems concurrently. Enough planning needs to be done to ensure installation meets desired needs. There are several options available for installing the operating system. We cover one of them in this chapter, another later in the book, and the rest are beyond the scope. Click Log In in the upper right corner with account credentials, or click Register and fill out the form to open a new account. Click Red Hat Enterprise Linux from the list if you already have an active subscription, or click Start Evaluation to obtain a free day trial.

Follow the instructions and links to download the RHEL 7. You can get technical support from Red Hat for your subscribed RHEL7 copy; the evaluation copy comes with day limited support with no updates available after the expiry of that time period. This procedure will destroy any data previously stored on the USB device. There are multiple options available with respect to accessing the installation software. In this chapter, we will perform an installation using the DVD that we have just created. It provides three main interfaces for interaction: graphical, text-based, and kickstart.

The graphical interface delivers an intuitive GUI to prepare a system for installation. It provides a central hub that lists groups of configuration options; you click the options that require modifications before beginning the installation process. One other major benefit of using the graphical installer is its ability to run some processor-intensive tasks such as storage layout detection in the background while allowing you to continue with the configuration.

Kickstart is a fully-automated method for RHEL7 installation. It does not require user intervention during the installation. It may be used to load RHEL7 on a number of systems at the same time with identical configuration.

The first thing that you need to do is understand the requirements for the installation. Critical items such as system and CPU types, amount of physical memory, and types and sizes of hard disks need to be determined. Installation may fail or the system may not function as expected if any of these requirements are not met. The following presents a discussion of these requirements.

There is a wide array of hardware platforms on which RHEL7 can be installed and run. The HCL lists a number of computer system brands that Red Hat engineers have tested and certified to work with RHEL7; however, a large number of computers and laptops both branded and unbranded that are not on HCL may still work without issues.

For laptop computers, visit www. If you have issues installing or running RHEL7 on your laptops, browse this website and search for the laptop model. It is likely that you will find a solution or a hint that helps fix the issue. This hardware, along with integrated support for hardware virtualization, should be used for the purpose of RHCSA and RHCE exam preparation, general learning, or for hosting virtual machines.

However, there are very few servers out there that require that much memory. For a typical RHEL7 server, enough physical memory should be available to support not only full RHEL but also the applications that the system is purposed to host.

Mastering Red Hat Enterprise Linux 3

The installation program asks us for several configuration items during the installation. Some of the questions are compulsory and must be answered appropriately while others are optional, and may be skipped for post-installation setup if desired. The configuration can be done in any sequence that you prefer. You should have the minimum mandatory configuration data handy and be ready to enter it when prompted.

During the installation, there are six text-based virtual console screens available to you to monitor the installation process, view diagnostic messages, and discover and fix any issues encountered. You can switch between screens by pressing a combination of keys. The information displayed on the consoles is captured in installation log files. This file also captures information on detected hardware, in addition to other data.

There are several log files created and updated as the installation progresses. These files record configuration and status information. We can view their contents after the installation has been completed to check how the installation proceeded. These files are described in Table Beginning in this chapter and throughout this book, several administration topics on system, network, and security will be presented, along with procedures on how to implement and administer them. A number of exercises will be performed and commands executed.

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The following minimum hardware and virtual machine configuration will be used to elucidate the procedures and perform the exercises and labs:. Though I highly recommend using a dedicated physical computer for the above, those who cannot afford or want convenience may build and use two virtual machines in VirtualBox, VMware, or some other virtualization software running on a Windows system.

Do not forget that some of the exam objectives do require virtualizing a physical host. Another option would be to get a physical computer for a short period of time just to practice the exercises and the labs presented in the virtualization chapter, and use Windows-based virtual machines for the rest. After the installation is complete, run the systemctl set-default graphical. Accept the license agreement and log on to the system.

This entire process may take up to 15 minutes of your exam time. See Chapter 05 " Managing Software Packages " for details, and other chapters to gain access to additional graphical tools. This procedure presumes that the physical computer meets the requirements presented in the previous sub-section. Name this system host1. Additional configuration will be supplied as the installation advances. The interface configuration, partitioning, base environments, user creation, network authentication services, NTP, and other topics will not be explained as part of this exercise; however, we will study them in detail in their respective chapters later in this book.

Screenshots presented in the Configuring Installation Destination sub-section in this exercise are taken from an installation performed in a VirtualBox virtual machine. You may see different disk sizes while studying Chapter 09 " Partitioning and Managing Disk Storage". Ignore the discrepancies. The Anaconda installer program waits for 60 seconds for you to alter the selection, or it goes ahead and boots using the default option. You can also press the Enter key after highlighting the first or the second option to start the installation process right away.

The installation begins in the graphical mode. The third option Troubleshooting , as shown in Figure , encapsulates several choices to address boot-related issues. These additional tasks allow you to perform an installation using a basic video driver in case the installer cannot load a proper driver for the installed video card , interact with the system to recover an installed RHEL7 copy facing boot issues, run a memory test, or boot using a local disk drive.

The next screen allows you to choose a language for use during the installation. The default is English. Click Continue. The Installation Summary screen appears next, as shown in Figure previous page. Here, you can make all necessary configuration changes prior to starting the installation.

You can configure these items in any sequence you like. See Figure Click Done in the upper left corner to save the changes and go back to the Installation Summary screen. If you do not wish to modify the default values shown, you can skip this step. Anaconda presents additional choices for keyboard layouts and languages for use during and after the installation.

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This should be done on systems where support for multiple keyboard layouts and languages is required. Click Done in the upper left corner to return to the Installation Summary. You can skip this step if you do not wish to include this additional support.

Mastering Red Hat Enterprise Linux 3, Michael Jang, (electronic resource)

This is where you can change the default RHEL7 installation source. You can also specify the locations of additional software repositories; however, they are not required for a complete RHEL7 installation. Click Done to return to the Installation Summary page after making the changes on this screen. Here, you can choose the base operating environment that you want installed. Base environments are pre-defined groups of software packages designed for specific purposes. They are listed with a short description in Table Choosing a base environment in the left pane reveals additional components on the right that become available for selection to be installed as part of the selected base environment installation.

The installer program automatically selects and installs pre-requisite software components in order to fulfill dependency requirements for a successful installation of the selected environment. The default is the Minimal Install. For this installation, choose Server with GUI without selecting any additional components. Click Done to return to the Installation Summary page. The Installation Destination allows you to choose an available local disk for installation and partition it. It also gives you the ability to add a remote disk and partition it.

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By default, Anaconda selects Automatic partitioning selected on the Installation Summary page. However, on the Installation Destination page, the installer lets you either retain the automatic partitioning or configure your own. The availability of a local disk represented as sda is also shown on this page. If you choose this option, you will be prompted to enter a passphrase to be used to access the partitions later. The Full disk summary and bootloader link at the bottom left corner on the Installation Destination page allows you to choose a disk to place the bootloader program on.

On a single disk system, you do not need to modify it. If you wish to choose automatic partitioning at this point, simply click the Done button to permit the installer to use automatic disk partitioning.