RHEL family tutorials

Learn Ansible when conditionals with variables, facts, registered output, lists, dictionaries, loops, block and role level conditions, and common mistakes.

Learn Ansible variable precedence with a practical order for group_vars, host_vars, play vars, vars_files, role defaults, role vars, and extra vars, plus debugging with ansible-inventory and debug tasks.

Write your first Ansible playbook step by step—project layout, package and service tasks, file and copy modules, become, simple vars, syntax check, check mode, and PLAY RECAP.

Run Ansible playbooks with ansible-playbook and ansible-navigator—inventory, --limit, --syntax-check, --check, --diff, verbosity, tags, become, extra vars, and stdout mode.

Learn Ansible playbook structure—plays, tasks, modules, hosts, become, vars, handlers, multiple plays, execution order, validation, and common layout mistakes.

Compare Ansible command, shell, and raw modules—pipes, argv, creates, removes, changed_when, Python bootstrap, security risks, and when to use dedicated modules instead.

Learn what Ansible is, how agentless automation works, and how control nodes, inventory, modules, playbooks, roles, collections, and vault fit together on Rocky Linux.

Learn Ansible comparison and logical operators, Jinja2 tests such as is defined, and safe when expressions for strings, lists, dictionaries, facts, and registered task results.

Learn YAML syntax for Ansible playbooks—indentation, lists, dictionaries, strings, booleans, multiline values, common mistakes, and ansible-playbook --syntax-check validation.

Learn Ansible facts from the setup module—OS, network, memory, mounts, and Python—plus fact filters, gather_facts control, custom facts.d files, and ansible_local in playbooks and templates.

Learn Ansible ad hoc command syntax with ping, command, shell, package, service, file, copy, user, become, --limit, check mode, troubleshooting, and playbook migration examples.

Learn Ansible roles with a tested demo: directory structure, tasks, handlers, defaults vs vars, variable placement, role dependencies, and when to use roles, include_role, or import_role.

Configure LUKS NBDE with Clevis and Tang on RHEL/CentOS: two-VM lab with Tang server, LUKS root client, dracut rebuild, and video—boot without typing a passphrase when Tang is reachable.

List users in Linux with getent, /etc/passwd, who, and id. Filter normal and system accounts, see logged-in sessions, and check whether a user exists on Ubuntu and RHEL.

Configure OpenSSH authentication in sshd_config: password, public key, keyboard-interactive, host-based, GSSAPI, AuthenticationMethods, and Match blocks on Linux.

List groups in Linux with getent, groups, id, and /etc/group. Check user group membership, list group members, and compare primary vs supplementary groups.

Import a CA or TLS certificate into Java cacerts on Ubuntu, Debian, RHEL, and Rocky Linux with keytool -importcert: locate cacerts, use a copy for safe testing, default password changeit, and distro-specific system trust …

Compare Ubuntu 26.04 LTS and Fedora Linux 44 in 2026: Debian-derived APT vs RHEL-upstream DNF, five-year LTS vs 13-month releases, snap vs Flatpak, AppArmor vs SELinux, cloud and enterprise fit, and practical desktop …

In this tutorial we will share steps and different methods to install EPE repo in Rocky Linux

Learn how to force Chrony time sync in Linux using chronyc makestep and chronyd -q. Also configure Chrony as an NTP client or server, check sync status, and understand server options like iburst, minpoll, and maxpoll.

Step-by-Step Tutorial to configure hugepages in red hat and centos 7/8 linux using vm nr_hugepages in /etc/sysctl.conf. Also configure hugepages pool using hugeadm

Learn how to check if CPU supports HugePages with 2MB and 1GB Size in CentOS/RHEl 7 Linux and change default hugepage size permanently using GRUB2 with examples

Learn how to check sudo access in Linux. Check if you or another user has sudo privileges with sudo -l, test sudo access non-interactively in a bash script with sudo -n, and list all sudo users, with real tested output.

Learn how to add a Linux user to the sudo group on Ubuntu and Debian, use the wheel group on RHEL-based systems, verify sudo access, and avoid confusing group-based sudo with custom sudoers file rules.

Learn how to check Linux kernel version with tested uname, hostnamectl, procfs, journalctl, dmesg, boot image, dpkg, and apt commands, and understand the difference between the running kernel and installed kernel …

Step by Step instructions to install yarn on Linux and WIndows. Installation on Ubuntu (Debian based) and Rocky Linux (Red hat based) and Windows.

How to extract/unpack/uncompress the contents of the initramfs image on RHEL7 and RHEL8? How do I list initramfs image file content? How do I modify the contents of an initrd or initramfs? How do I view an initrd or …

To create custom ISO in RHEL/CentOS 8, create a kickstart file and modify the isolinux.cfg for boot menu. You can also minimze the package list and update repodata

Step by Step tutorial to configure samba active directory domain controller in CentOS 8 Linux. Install Windows AD alternative in Linux. Free domain controller software in Linux

Step by Step NFS configuration Guide to install and configure NFS server in RHEL/CentOS 7/8. NFS server tutorial. How to check NFS status in Linux. setup nfs server