Lessons
One lesson per exam domain: the essentials, the commands, and what to check.
Essential shell tools
Navigation, redirections, pipes, grep/regex, sed, find, tar — the toolbox behind almost every exam task.
Docs and built-in help
man, apropos, info: find the right answer in seconds instead of searching the web.
Managing services with systemd
systemctl, units, dependencies, targets and journalctl — the heart of RHEL administration.
Boot targets and processes
systemd targets, rescue mode, resetting a lost root password, signals and process priority.
Storage: partitions and LVM
Create a logical volume, format it XFS, mount it persistently in fstab and grow it online.
Network mounts: NFS and autofs
Mount an NFS export at boot, then make it on-demand with autofs (automounter).
Permissions, umask and ACLs
POSIX modes, special bits (setgid, sticky), umask and access control lists.
Users, groups and sudo
useradd/usermod, password expiry (chage), secondary groups and safe sudo delegation.
Networking with nmcli and firewalld
Set a static IP, gateway and DNS with nmcli; open services in firewalld.
SELinux: modes, contexts, troubleshooting
Modes, file contexts, booleans, and the diagnostic method when a service refuses to work.
Containers with Podman
Run, inspect and publish a rootless container, manage volumes and ports, and make it start at boot.
Shell scripts, cron and timers
Write a robust script (set -euo pipefail, exit codes) and schedule it with cron or a systemd timer.