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KVM-based virtual machines can easily be configured on RHEL 9 using the virt-install command-line tool, the virt-manager GUI tool, or the Virtual Machines module of the Cockpit web console. This chapter will use Cockpit to install an operating system as a KVM guest on a RHEL 9 host. The chapter titled Creating KVM Virtual Machines…

Earlier versions of RHEL provided two virtualization platforms: Kernel-based Virtual Machine (KVM) and Xen. In recent releases, support for Xen has been removed, leaving KVM as the only bundled virtualization option supplied with RHEL 9. In addition to KVM, third-party solutions are available in products such as VMware and Oracle VirtualBox. Since KVM is supplied…

Virtualization is the ability to run multiple operating systems simultaneously on a single computer system. While not necessarily a new concept, Virtualization has come to prominence in recent years because it provides a way to fully utilize the CPU and resource capacity of a server system while providing stability (in that if one virtualized guest…

Although Linux has made some inroads into the desktop market, its origins and future are very much server based. It is unsurprising, therefore, that RHEL 9 can act as a file server. It is also common for RHEL and Windows systems to be used side by side in networked environments. Therefore, it is a common…

RHEL 9 provides two mechanisms for sharing files and folders with other systems on a network. One approach is to use a technology called Samba. Samba is based on Microsoft Windows Folder Sharing and allows Linux systems to make folders accessible to Windows systems and access Windows-based folder shares from Linux. This approach can also…

In the previous chapter, we looked at how to display the entire RHEL 9 desktop on a remote computer. While this works well if you need to display the entire desktop remotely, it could be considered overkill if you only want to display a single application. Therefore, this chapter will look at displaying individual applications…

RHEL 9 can be configured to provide remote access to the graphical desktop environment over a network or internet connection. Although not enabled by default, displaying and accessing a RHEL 9 desktop from a system anywhere else on a network or the internet is relatively straightforward. This can be achieved regardless of whether that system…

When a RHEL 9 system is first installed, it is configured by default to allow remote command line access via Secure Shell (SSH) connections. SSH provides password-protected and encrypted access to the system for the root account and any other users added during the installation phase. However, this level of security is inadequate and should…

It is difficult to envisage a RHEL 9 system that does not have at least one network connection and harder still to imagine how such an isolated system could be of much practical use. The simple fact is that RHEL 9 is designed to provide enterprise-level services over network and internet connections. Therefore, a crucial…

To gain proficiency in RHEL 9 system administration, it is essential to understand the concepts of systemd units with a particular emphasis on two specific types known as targets and services. This chapter aims to provide a basic overview of the different systemd units supported by RHEL 9 combined with an overview of how to…