Systemd Administration

Install Red Hat Enterprise Linux 8.8 in VirtualBox, create a VM named System D, configure root and admin users, and perform yum update after registering with Red Hat.

Trace the evolution from init and sysvinit to systemd, and learn how systemd manages startup and services, enables parallel startup with targets, uses cgroups, logs centrally, and handles mounting.

Explore systemd components, including system utilities such as systemctl and journalctl, daemons, targets, unit files, libraries, and the kernel, and how they manage services.

Explore systemd unit and configuration files, including service, socket, slice, mount, target, timer, path, and swap units. Learn where files live and how to view or manage them with systemctl.

Compare init and systemd boot processes, showing how systemd reads unit files from /etc/systemd/system and /lib/systemd/system, starts default targets, and runs services in parallel.

Explore systemd unit files and how service, target, mount, timer, socket, device, swap, path, slice, and snapshot units manage resources, services, mounts, and timer-triggered actions.

Explore systemd service units and how they configure background daemons like httpd and cron. Highlight directives such as type, environment, restart, and install to control startup and service behavior.

Explore systemd socket units that define listening sockets (tcp, udp, or unix) to launch daemons on demand, replacing inetd and coordinating with service files.

Discover how path units monitor a specific file or directory for changes and trigger the associated service, activating the printing service on local file system events.

Explore systemd mount units and generators, learn how fstab drives automatic mount unit creation, and understand dynamic boot-time generation of mount units for local file systems.

Explore systemd targets and how they group units to replace run levels, including passive targets, graphical, multi-user, network, and reboot targets.

Master systemctl in systemd to manage services, including starting, stopping, enabling, disabling, restarting, and masking. Inspect service status, pids, and unit types (service, socket, path) using systemctl, ps, and grep.

simulate a problem by renaming apache and cron binaries, then use systemctl and journalctl to identify and reset failed services, reload daemon, and restore active status.

Modify a service by copying its file into /etc/systemd, using systemctl edit to create an override, then reload the daemon and enable the Apache alias for HTTPD.

Create a new systemd service by writing a unit file in /etc/systemd, reload the daemon, start the service, and verify output in /tmp and logs with journalctl.

Change the default systemd editor from nano to Vim by exporting the editor variable, updating defaults in env keep, and sourcing bashrc; verify the change with systemctl status showing Vim.

Learn to use systemd-analyze to examine boot performance, diagnose slow startup times, and inspect how services initialize with flame, analyze critical chain, verify, and security analyses.

Explore how systemd timers replace cron with built-in, calendar-based scheduling that runs tasks at specific times or intervals, featuring better logging, reliability, and flexible configurations.

View and set the system hostname on systemd Linux with hostnamectl, mastering static, transient, and pretty hostnames, and review machine id, boot id, operating system, kernel, and architecture details.

Explore localectl in systemd to configure locale and keyboard layouts, understand language, date formats, and UTF-8 encoding, and learn to list and set locals and key maps.