Linux Red Hat Certified Engineer (RHCE - EX294)

Discover how Ansible, an open source provisioning, configuration management and application deployment tool, enables infrastructure as code across Unix-like and Windows systems, automating tasks on local and remote machines.

Explore how Ansible's agentless, ssh-based automation reduces human errors and boosts productivity across servers, networks, and cloud. Learn core terms like control node, modules, tasks, playbooks, YAML, inventory, and roles.

Explore how Ansible automates IT tasks by organizing modules into plays and playbooks written in yaml, then executes them across remote hosts.

Design and set up a lab using Ansible to automate tasks across Linux and Windows servers, establishing a control node and remote clients through virtualization.

Learn to install Oracle VirtualBox, create a Linux virtual machine, install CentOS 8, and set up Ansible on the node, including snapshots, network setup, and verification.

Learn how to install Linux on a cloud platform by creating and launching an AWS virtual machine using the free tier, including selecting a Red Hat AMI.

Set up Ansible with a control node and remote clients. Create a virtual machine as a client, install Linux, and configure bridged networking for remote execution.

Install and verify the Ansible engine on the Linux lab VM, and create a snapshot. Examine the /etc/ansible files, including hosts and ansible.cfg, to enable local and remote automation.

Discover the Ansible configuration file, including remote_user, host_key_checking, and inventory, and learn how to enable privilege escalation with become and become_user.

Learn to write Ansible YAML playbooks with proper indentation and sequential task execution, using modules like yum and service to install and start packages.

Create your first Ansible playbook using vi or yaml tools, targeting the local host with the ping module. Learn yaml structure, snapshot-based rollback, syntax checks, and running playbooks with ansible-playbook.

Write a second ansible playbook named hello world that uses yaml, runs on localhost, and prints hello world via the debug module's message option when executing with ansible-playbook.

Create a multi-task ansible playbook in vim that combines two tasks into one, pings the local host, and prints hello world using ping and debug modules.

Install and start the httpd package on a local host using an Ansible playbook, defining a yaml file, yum or dnf module, and the service module.

Explore host file syntax for Ansible by listing clients in an inventory, grouping by app, web, and database servers, and using static or dynamic hosts with IP ranges and aliases.

Establish a passwordless SSH from the Ansible control node to a remote Linux client, configure inventory, generate and copy SSH keys, and test with an Ansible ping and uptime.

Create client status.yaml from the local host connectivity playbook to run on all hosts in the Ansible inventory. Execute it on the control node and verify remote ping succeeds.

Copy files from the Ansible control node to multiple remote clients using the copy module and a playbook, with defined source, destination, ownership, and permissions.

Learn to change a remote file's permissions by writing an Ansible playbook with the file module, specifying the path and mode, then running the playbook and verifying results.

Learn to check file or directory status with Ansible's stat module, verify existence, and review attributes such as permissions, ownership, and timestamps using a YAML playbook.

Create a directory and a file in an Ansible playbook, then remove the file, using the file module, stat, and debug to verify status.

Create an Ansible playbook on the localhost that uses the file module to create /tmp/jorge and blockinfile to add text with IP and hostname.

Create and run an Ansible playbook to install the httpd package, start the httpd service, open the firewall dx http port, and restart the firewall dx to apply changes.

Learn to run shell scripts on remote Linux clients with Ansible, using a playbook and the shell module to execute scripts at an absolute path and verify results.

Learn how to schedule a bash script on remote clients using an Ansible playbook and the cron module, running as root every Thursday at 10 a.m.

Learn to create an Ansible playbook named tomcat.yaml that downloads Tomcat from a URL, creates /ops/tomcat with 0755 permissions, and uses the get_url module on the local host.

Create and mount a new storage partition on a linux virtual machine using an ansible playbook with ported and mount modules, targeting /dev/sdb1 and /data.

Use Ansible to automate creating a user on remote Linux machines with a playbook named add user YAML, assigning home /home/george and shell /bin/bash.

Learn to securely add or update a Linux user password with Ansible by using a vault-protected variable, hashing the password, and applying it via the user module.

Learn to use an Ansible playbook to identify and forcefully kill a running process across remote hosts by capturing the process ID and executing the kill command.

Learn to pick and choose steps in an Ansible playbook with --start-at-task, using a YAML example that installs httpd, starts the service, and installs telnet.

Learn to run Ansible ad hoc commands for on-demand tasks, including pinging hosts and using the file and copy modules to manage files across remote clients.

Learn ansible commands to install and remove packages like telnet and http manual, manage services (start and enable at boot), and verify status on hosts using yum, service, and shell.

Learn practical ansible ad hoc commands for remote hosts: create and delete users, manage groups, retrieve system info with setup, and run simple commands like reboot without a shell.

Learn how ansible handlers run at the end of a play, triggering restart or reload only when notified by a task, with practical firewall DX and http service examples.

Learn how to apply conditions in Ansible playbooks to control task execution, using when statements and built-in facts like ansible_os_family to install Apache on Debian or Red Hat systems.

Learn to use loops in Ansible playbooks to automate tasks like creating multiple users and installing packages, using loop and with_items.

Learn how ansible roles modularize playbooks by grouping tasks into reusable templates, enabling management of http package installation, service start, firewall rules, and deployment across east and west web servers.

Organize an Ansible playbook by application roles to install apache, time synchronization, and dns packages with yum and gamma modules; create roles directories with tasks/main.yaml to keep the playbook concise.

Explore and install user creation roles from Ansible Galaxy, search for roles, install via the Galaxy command, and locate the downloaded role in your home directory for easy reuse.

Learn how to use Ansible tags to target specific tasks in a playbook, list tags, and run or skip tasks by tag, and understand start-at-task behavior.

Define and reuse variables in Ansible playbooks, using names starting with a letter and containing letters, numbers, and underscores, referenced with double curly braces in package installation and service tasks.

Define and reuse variables in Ansible inventory file to avoid hardcoding ip addresses or hostnames, grouping servers with abc and translating foo_server to a fully qualified domain name with ansible_host.

Secure your Ansible code with the Ansible Vault feature, password-protecting and encrypting YAML files to share playbooks across teams and run encrypted playbooks with vault passwords.

Learn to encrypt individual strings inside an Ansible playbook using vault, paste the encrypted value into a variable, and decrypt at runtime with a password.

Compare Puppet and Chef with Ansible, noting Ruby-based scripting, agentless operation, and easier installation, well-documented.

Clarify that open source Ansible and Red Hat Ansible are the same software, with Red Hat offering Ansible Tower for management and support, and AWACS as an open source alternative.

Learn about ansible awx and tower, their web UI and API, managing playbooks and inventories, plus a comparison of open source awx with Red Hat's tower and basic install concepts.

Learn to use Ansible's additional commands, including ansible, ansible-playbook, and ansible-config, plus console, doc, galaxy, and inventory commands, with guidance to use help for options.

Explore official and community Ansible documentation, learn where to find modules, playbooks, and latest releases, and discover webinars, training, and community channels for support.

Celebrate your journey through the Linux Red Hat certified engineer (RHCE - EX294) course. Celebrate the Congratulations lecture as part of your Linux Red Hat certified engineer journey.

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