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Introduction:
The Red Hat Certified Engineer (RHCE) exam has evolved beyond traditional Linux system administration, placing heavy emphasis on automation using Ansible. This certification validates your ability to automate provisioning, configuration, and application deployment in production environments—skills that are critical for modern DevOps and DevSecOps roles.
Learning Objectives:
- Understand the core components of Ansible (inventory, modules, playbooks, variables, facts, templates, handlers, roles) as required by the RHCE exam.
- Build and structure a complete preparation path including hands-on labs, mock exams, and real-world automation scenarios.
- Apply security best practices for automation (Ansible Vault, SSH hardening, least privilege) and integrate DevSecOps principles.
You Should Know:
- Setting Up Your Ansible Control Node and Managed Hosts
Before diving into playbooks, you need a functional Ansible environment. The RHCE expects you to configure the control node (usually RHEL 9) and manage multiple target hosts.
Step‑by‑step guide:
- Install Ansible on your RHEL or Rocky Linux control node:
sudo dnf install ansible-core -y ansible --version
- Create an inventory file (
/etc/ansible/hostsor a project-specific one):[bash] web1.example.com ansible_user=root web2.example.com ansible_user=root</li> </ol> [bash] db1.example.com ansible_user=admin
3. Set up SSH key‑based authentication to managed hosts:
ssh-keygen -t rsa -b 4096 ssh-copy-id user@managed-host
4. Test connectivity with the `ping` module:
ansible all -i inventory.ini -m ping
5. Verify fact gathering (setup module) to understand system variables:
ansible webservers -m setup | grep ansible_os_family
What this does: It establishes the foundation for all automation tasks. Without a correctly configured inventory and SSH access, no playbook can run.
- Writing Your First Playbook – YAML Syntax and Modules
Playbooks are the heart of Ansible automation. The RHCE exam tests your ability to write idempotent, well‑structured playbooks.
Step‑by‑step guide:
1. Create a playbook file `first_playbook.yml`:
<ul> <li>name: Ensure httpd is installed and running hosts: webservers become: yes tasks:</li> <li>name: Install Apache ansible.builtin.yum: name: httpd state: present</p></li> <li><p>name: Start and enable httpd ansible.builtin.service: name: httpd state: started enabled: yes
- Writing Your First Playbook – YAML Syntax and Modules
- Define variables in your inventory or separate files. Create
group_vars/webservers.yml:httpd_port: 8080 server_admin: [email protected]
- Define a handler in your playbook (usually at the bottom):
handlers:</li> </ol> - name: restart httpd ansible.builtin.service: name: httpd state: restarted
2. Notify the handler from a task:
tasks: - name: Update Apache config ansible.builtin.template: src: httpd.conf.j2 dest: /etc/httpd/conf/httpd.conf notify: restart httpd
3. Use conditionals to skip tasks on specific OS versions:
- name: Install EPEL on RHEL 8 or older ansible.builtin.yum: name: epel-release state: present when: ansible_distribution_major_version | int < 9
Exam relevance: The RHCE often includes scenarios where you must restart a service only when its configuration changes, not on every run.
5. Structuring Automation with Roles and Ansible Galaxy
Roles are the professional way to reuse and share automation. The exam requires you to understand role structure and use roles from Galaxy.
Step‑by‑step guide:
1. Create a role skeleton using `ansible-galaxy`:
ansible-galaxy role init my_webserver_role
2. The role directory structure:
my_webserver_role/ ├── tasks/ │ └── main.yml ├── handlers/ │ └── main.yml ├── templates/ ├── files/ ├── vars/ │ └── main.yml └── defaults/ └── main.yml
3. Populate `tasks/main.yml` with your Apache installation tasks.
4. Use the role in a playbook:
- name: Apply web server role hosts: webservers roles: - my_webserver_role
5. Download community roles (e.g., for hardening):
ansible-galaxy collection install community.general
Pro tip: For the RHCE, know how to pass variables to roles using `vars:` or role parameters.
- Ansible Automation Platform (AAP) – What You Need for the Exam
The latest RHCE exam (EX294/EX294 v8) includes concepts of Red Hat Ansible Automation Platform, specifically Automation Controller (formerly Tower) and Execution Environments.
Step‑by‑step guide (conceptual + CLI equivalents):
- Understand that AAP provides a web UI, RBAC, and job scheduling over Ansible core.
- Know how to create a project (links to a Git repo containing playbooks).
- Know how to create an inventory (hosts and groups) and credentials (SSH keys, Vault passwords).
- Understand job templates – linking a project, inventory, and credentials to run a playbook.
- For the exam, be able to use `ansible-navigator` to run playbooks in an execution environment:
ansible-navigator run playbook.yml --mode stdout
Important: The exam does not require deep AAP administration, but you must know the purpose of each component and how to interact with automation controller via the command line.
7. Security Hardening for Ansible (Vault, SSH, DevSecOps)
Automation introduces security risks – credentials in plaintext, over‑privileged SSH keys, and exposed variables. The RHCE expects basic security awareness.
Step‑by‑step guide:
1. Encrypt sensitive variables using Ansible Vault:
ansible-vault create secrets.yml Inside, write: db_password: SuperSecret123
2. Use the encrypted file in a playbook:
- name: Deploy app with secret hosts: dbservers vars_files: - secrets.yml tasks: - name: Set DB password ansible.builtin.set_fact: db_pass: "{{ db_password }}"3. Run the playbook with the vault password file or prompt:
ansible-playbook site.yml --ask-vault-pass
4. Harden SSH on managed hosts – disable root login, use key‑only authentication, and limit users:
On managed host as root echo "PermitRootLogin no" >> /etc/ssh/sshd_config echo "PasswordAuthentication no" >> /etc/ssh/sshd_config systemctl restart sshd
5. Apply least privilege – create a dedicated `ansible` user with sudo for specific commands only (use
sudoers):ansible ALL=(ALL) NOPASSWD: /usr/bin/dnf, /usr/bin/systemctl
What this does: Vault protects secrets at rest, SSH hardening reduces attack surface, and limited sudo prevents accidental or malicious system damage.
What Undercode Say:
- Key Takeaway 1: The RHCE exam is no longer about memorizing Linux commands – it tests your ability to automate real‑world system administration using Ansible. Building a structured preparation path with labs and mock exams is essential.
- Key Takeaway 2: Security must be embedded into automation from the start. Using Ansible Vault, dedicated service accounts, and idempotent playbooks not only helps you pass the exam but also prepares you for production DevSecOps roles.
Analysis: The shift toward automation in certifications like RHCE reflects industry demand for “automation engineers” rather than traditional sysadmins. Resources in French (as Stephane ROBERT plans to provide) address a genuine gap, but the principles are universal. Candidates who focus on hands‑on labs – especially writing playbooks from scratch, debugging variable precedence, and using conditionals/handlers – will outperform those who only study theory. Furthermore, understanding Ansible Automation Platform basics is becoming non‑negotiable as enterprises adopt centralized automation governance. The future of RHCE will likely integrate more cloud provisioning (AWS, Azure) and container orchestration (Podman, Kubernetes) alongside Ansible.
Prediction:
Within the next 18 months, RHCE will evolve to require proficiency with Ansible Content Collections, Execution Environments (containers), and Automation Controller as default tools, not optional extras. Candidates who master these now will have a significant competitive advantage. Additionally, AI‑assisted code generation for Ansible playbooks (e.g., using GitHub Copilot) will become an accepted part of exam preparation, though live exams will still test foundational syntax and logic without AI help. The demand for RHCE‑certified professionals in hybrid cloud and edge computing environments will grow by over 40% as organizations standardize on Red Hat’s automation ecosystem.
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- Ansible Automation Platform (AAP) – What You Need for the Exam
2. Run the playbook:
ansible-playbook -i inventory.ini first_playbook.yml
3. Check for idempotency (running twice should show no changes):
ansible-playbook -i inventory.ini first_playbook.yml --check
Pro tip for the exam: Always use fully qualified collection names (e.g., `ansible.builtin.yum` instead of yum) to avoid deprecation warnings.
3. Variables, Facts, and Templates (Jinja2)
Dynamic configurations require variables and templating. The RHCE expects you to use facts gathered from managed hosts and inject variables from multiple sources.
Step‑by‑step guide:
2. Use variables in a playbook:
- name: Configure Apache with variables
hosts: webservers
vars:
doc_root: /var/www/custom
tasks:
- name: Ensure document root exists
ansible.builtin.file:
path: "{{ doc_root }}"
state: directory
3. Create a template `index.html.j2`:
<html>
<body>
<h1>Welcome to {{ ansible_hostname }}</h1>
Managed by Ansible on {{ ansible_os_family }}
</body>
</html>
4. Deploy the template using the `template` module:
- name: Deploy custom index page ansible.builtin.template: src: index.html.j2 dest: /var/www/html/index.html
What this does: Templates allow you to generate configuration files dynamically based on each host’s unique facts, reducing duplication and human error.
4. Handlers and Conditionals – Reacting to Changes
Handlers are triggered only when a task changes the system, ideal for restarting services. Conditionals let you execute tasks selectively.
