DevOps Tools, CI/CD and Automation Guides

Compare seven multi-cloud management platforms for enterprise teams, from architecture design and IaC orchestration to Kubernetes, FinOps, observability, and security.

Compare Cinder block storage and Swift object storage in OpenStack, including access methods, architecture, use cases, scalability, and integration.

Compare seven change data capture platforms for streaming database changes into Snowflake, from fully managed services to open-source capture engines you operate yourself.

Set up a practical Ansible Git and VS Code workflow on Rocky Linux—clone a repo, edit YAML safely, commit playbooks, ignore secrets and cache files, run ansible-playbook from the integrated terminal, lint with …

Pin amazon.aws 8.2.0, set EC2 values in vars/aws_lab.yml, and use amazon.aws.ec2_instance with vpc_subnet_id and security group IDs to launch, tag, start, stop, and terminate instances by ID or tag filter.

Free Kubernetes tutorial that takes you from cluster install to CKA/CKAD-level topics - pods, deployments, RBAC, networking, Helm, security, autoscaling. 59 hands-on lessons across 11 chapters, every example tested on …

Use Ansible on Rocky Linux 10 to generate /etc/hosts from inventory and facts, create and extract archives, render system reports with Jinja2 templates, and fetch reports to the control node.

Use Ansible on Rocky Linux 10 to open firewalld services and ports with runtime and permanent rules, set SELinux mode and booleans, add file contexts with sefcontext, apply labels with restorecon, and verify both layers …

Build Rocky Linux 10 storage with Ansible in order—partition a safe target disk, create LVM volume groups and logical volumes, format XFS, mount persistently in /etc/fstab, verify with lsblk/findmnt, and extend volumes …

Use Ansible on Rocky Linux 10 to start and enable systemd units, reload the manager, change default targets, reboot safely, manage cron and at jobs, and verify state with service_facts.

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.