RHEL family tutorials

Use Ansible on Rocky Linux 10 to create users and groups with UID/GID, manage SSH authorized keys, generate SSH keys, set account expiry, store password hashes with Vault, and configure validated sudoers files safely.

Learn Ansible dnf and yum_repository on Rocky Linux 10—install, remove, update packages, package groups, custom repo files, GPG check, enable or disable repos, and verification with tested playbooks.

Fix Ansible collection not found, module not found, FQCN resolution, collection path mismatches, and undefined variable errors in inventory, roles, and templates—with commands and real error output.

Debug Ansible playbooks by printing variables with debug, capturing task output with register, validating assumptions with assert, inspecting files and facts, and previewing changes with --check, --diff, and verbosity.

Troubleshoot Ansible playbooks from inventory and SSH through sudo, YAML syntax, variables, collections, Vault, and templates—with commands and error tables for common failures.

Learn Ansible collections, FQCN module names, ansible-galaxy collection install, collection requirements.yml, and RHEL System Roles examples for timesync, network, SELinux, storage, and firewall.

Use Ansible sefcontext for persistent SELinux file labels, restorecon to apply them, and ls -Z or semanage fcontext to verify—plus troubleshooting when services fail despite correct chmod.

Choose Ansible lineinfile, blockinfile, replace, or template for config edits—with idempotency rules, risk comparison, validate, and tested examples on sshd-style and app config files.

Learn the Ansible template module and Jinja2—variables, facts, conditionals, loops, filters, whitespace, validate, backup, handlers, and template vs copy with tested examples.

Use Ansible file for path state, copy to push files to managed hosts, and fetch to pull files back—with permissions, backup, validate, remote_src, and common mistakes.

Learn a safe Ansible Vault layout for group_vars and host_vars, including vault IDs, Git-safe structure, secret naming, and runtime patterns that avoid leaking credentials.

Learn Ansible register variables for task output (stdout, stderr, rc) and magic variables such as inventory_hostname, groups, hostvars, and ansible_play_hosts, with loop results and when conditions.

Learn Ansible variables—strings, numbers, booleans, lists, dictionaries, nested data, Jinja access, play vs inventory vars, vars files, and common naming mistakes.

Learn Ansible idempotency—ok vs changed, state-based modules, avoiding shell misuse, creates and removes, changed_when, handlers, repeated-run checks, and check mode.

Learn Ansible modules, FQCN names, ansible-doc options and return values, collections, ansible-galaxy install, requirements.yml, collections_path, and module-not-found fixes.

Learn where Ansible group_vars and host_vars belong, how variables merge per host, how inventory patterns and --limit target hosts, and how to verify variables with ansible-inventory.

Configure ansible-navigator.yml at the project root—search order, precedence, stdout vs interactive mode, execution environments, artifacts, logging, and verification with settings and ansible-config on Rocky Linux 10.

Learn how to organize an Ansible project with ansible.cfg, inventory, playbooks, roles, inventory/group_vars, inventory/host_vars, requirements.yml, vault files, and Git-friendly best practices.

Build a two-node EX294 Ansible practice lab on Rocky Linux 10: hostnames, /etc/hosts, ansible user, SSH keys, passwordless sudo, and connectivity checks before installing ansible-core.

Learn Ansible error handling with block, rescue, always, failed_when, changed_when, register checks, ignore_errors trade-offs, unreachable hosts, and meta: clear_host_errors.

Learn Ansible tags to run or skip selected playbook tasks at runtime with --tags, --skip-tags, always, never, play and role tags, and safe partial runs.

Learn Ansible loops with loop, loop_control, register results, when per item, until retries and delay, and when to use wait_for instead of looping.

Learn Ansible handlers with notify, service restarts, execution order, listen, flush_handlers, loops, roles, changed_when pitfalls, and common troubleshooting mistakes.

Learn how Ansible inventory files list hosts and groups in INI or YAML, where to place variables, how parent and child groups work, and how to verify with ansible-inventory and ping on Rocky Linux 10.

Configure ansible.cfg at the project root—search order, defaults, inventory path, remote_user, become, roles_path, and verification with ansible --version and ansible-config on Rocky Linux 10.

Install Ansible on Rocky Linux 10 using ansible-core, EPEL collection RPMs, pipx, or pip. Add ansible-navigator, Podman, verify versions, and run your first ping test.

Create Ansible roles with ansible-galaxy init, customize tasks, defaults, handlers and templates, install Galaxy roles, and pin versions in requirements.yml.

Learn Ansible Vault to encrypt files and variables with create, view, edit, encrypt, decrypt, rekey, vault IDs, password options, and secure group_vars and host_vars usage.

RHCE EX294 objectives explained as a practical Ansible study plan, with RHCSA task mapping, ansible-navigator focus, Rocky Linux lab guidance, and GoLinuxCloud course links.

Compare Ansible import_tasks and include_tasks for static vs dynamic task loading, with conditions, loops, tags, apply, list-tasks behavior, and when to use each.