Resources

• Linux Command Cheat Sheet — 6 min read
• Kubernetes Troubleshooting Flow — 8 min read
• Containers vs Virtual Machines — 5 min read
• A Practical Git Branching Workflow — 5 min read
• Why Terraform State Matters — 6 min read
• IAM Least Privilege in Practice — 7 min read
• Ansible Playbooks: Automating Servers Without Agents — 6 min read
• Nginx as a Reverse Proxy in Front of an App — 5 min read
• The Node.js Event Loop and Why Blocking Hurts — 6 min read
• MySQL Indexes and Reading EXPLAIN Output — 6 min read
• Redis Caching: Keys, Expiry, and Cache-Aside — 5 min read
• MongoDB Document Design and Common Queries — 5 min read
• Java Heap Sizing and Reading GC Logs — 6 min read
• Helm Charts: Templates, Values, and Releases — 5 min read
• Managing Services with systemd and journalctl — 5 min read
• Docker Multi-Stage Builds for Smaller Images — 5 min read
• Kubernetes Deployments and Safe Rollouts — 6 min read
• Rewriting History with Rebase and Cherry-Pick — 6 min read
• Terraform Modules and Input Variables — 5 min read
• AWS IAM Roles and Temporary Credentials — 6 min read
• Python Virtual Environments and Pinned Dependencies — 5 min read
• Hardening SSH on a Linux Server — 5 min read
• Subnetting Cheat Sheet (/24 to /30) — 6 min read
• OSPF Single-Area: How Neighbours Form — 7 min read
• VLANs, Trunks and STP Explained — 7 min read
• ACLs: Standard vs Extended, Where to Apply — 6 min read
• RH124 Ch 1: Getting Started with RHEL — 4 min read
• RH124 Ch 2: Working in the Bash Shell — 5 min read
• RH124 Ch 3: Managing Files and Links — 5 min read
• RH124 Ch 4: Finding Help Without the Internet — 4 min read
• RH124 Ch 5: Creating and Editing Text Files — 5 min read
• RH124 Ch 6: Users, Groups and sudo — 6 min read
• RH124 Ch 7: Permissions, umask and Special Bits — 6 min read
• RH124 Ch 8: Monitoring and Controlling Processes — 5 min read
• RH124 Ch 9: Controlling Services with systemd — 5 min read
• RH124 Ch 10: Configuring and Securing SSH — 6 min read
• RH124 Ch 11: Logs, the Journal and Time — 6 min read
• RH124 Ch 12: Networking with NetworkManager — 6 min read
• RH124 Ch 13: Archiving and Transferring Files — 5 min read
• RH124 Ch 14: Installing Software with dnf and Flatpak — 6 min read
• RH124 Ch 15: Accessing Linux File Systems — 5 min read
• RH124 Ch 16: Analysing Servers and Getting Support — 4 min read
• RH134 Ch 1: Bash Scripts That Save You Time — 6 min read
• RH134 Ch 2: Scheduling with at, cron and systemd Timers — 6 min read
• RH134 Ch 3: tuned Profiles and Process Priority — 5 min read
• RH134 Ch 4: SELinux Without Switching It Off — 6 min read
• RH134 Ch 5: Partitions, File Systems and Swap — 7 min read
• RH134 Ch 6: LVM — Flexible Storage — 7 min read
• RH134 Ch 7: NFS and autofs — 6 min read
• RH134 Ch 8: Controlling the Boot Process — 6 min read
• RH134 Ch 9: firewalld Essentials — 6 min read
• RH134 Ch 10: Automating Installs with Kickstart — 5 min read
• RH134 Ch 11: Running Containers with Podman — 7 min read
• RH134 Ch 12: Image Mode for RHEL (bootc) — 5 min read
• RHCSA (EX200) Exam Strategy: Time, Reboots and Lost Points — 7 min read
• RH294 Ch 1: Ansible, ansible.cfg and ansible-navigator — 6 min read
• RH294 Ch 3: Writing Your First Playbooks — 6 min read
• RH294 Ch 4: Variables, Facts and Magic Variables — 7 min read
• RH294 Ch 5: Keeping Secrets with Ansible Vault — 6 min read
• RH294 Ch 6: Loops, Conditions, Handlers and Error Handling — 7 min read
• RH294 Ch 7: Deploying Files with Templates and File Modules — 6 min read
• RH294 Ch 8: Host Patterns, Imports, Includes and Tags — 5 min read
• RH294 Ch 9: Roles, Collections and RHEL System Roles — 6 min read
• RH294 Ch 10: Git, VS Code and ansible-navigator — 5 min read
• RH294 Ch 11: Troubleshooting Playbooks — 5 min read
• Ansible for Packages and Repositories — 4 min read
• Ansible for Services and systemd — 4 min read
• Ansible for firewalld Rules — 4 min read
• Ansible for Partitions, LVM and File Systems — 4 min read
• Ansible for File Content — 4 min read
• Ansible for Archives — 4 min read
• Ansible for cron and at Jobs — 4 min read
• Ansible for SELinux — 4 min read
• Ansible for Users, Groups, Vault and sudo — 4 min read
• RHCE (EX294) Exam Strategy: Format, Time and Common Point Losses — 5 min read