DevOps Tools, CI/CD and Automation Guides

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.

Connect Ansible to managed nodes with SSH passwords using --ask-pass (-k), understand -K vs -k, sshpass requirements, and when key-based auth is still preferred on Rocky Linux 10.

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.

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.

Free, hands-on Ansible tutorial for beginners that takes you from zero to RHCE EX294. Rocky Linux 10 lab setup, playbooks, roles, vaults, and AWS provisioning — 49 lessons across 12 chapters, every example tested on …

Stop all running Docker containers with docker stop $(docker ps -q), handle empty lists safely, adjust timeouts, force-kill stuck containers, filter by label, and shut down Compose stacks without data loss.

Explore solutions to the Docker error 'can only create exec sessions on running containers: container state improper.

Learn how to keep a Docker container running using multiple methods like TTY mode, entrypoint, sleep infinity, and process management. Fix containers exiting immediately with practical examples and best practices.

Learn how to override Docker ENTRYPOINT and CMD using docker run options. Understand the difference between ENTRYPOINT and CMD with practical examples and best practices.

Learn how to use docker ps -a to list all containers including stopped ones. Explore examples, filters, and output details to manage Docker containers effectively.

There are 3 different possible methods to perform docker container SSH. Using docker exec, docker attach and by running a SSHD service inside a container and using SSH client to connect to container