Linux · 5 min
tmux Cheat Sheet: Sessions, Windows, Panes and Copy Mode
A tmux reference for remote work: sessions that survive SSH drops, windows, split panes, copy mode, synchronized panes, and a minimal tmux.conf.
ssh
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Infrastructure as Code · 29 min
Terraform on AWS: EC2, State, Backends, Workspaces and Modules
A hands-on Terraform walkthrough on AWS: launch EC2, read the state file, handle drift, use map variables, provisioners, outputs, an S3 backend, workspaces and modules.
Cloud & AWS · 24 min
Amazon EC2 Hands-On: Launch, Scale and Monitor Instances
Launch an EC2 instance and connect over SSH, then add a launch template, an Auto Scaling group, an Application Load Balancer and a CloudWatch alarm, with fixes for common errors.
Infrastructure as Code · 12 min
Ansible Templates, Handlers, Roles and Vault
Push chrony NTP config with templates, edit sshd_config with lineinfile, restart services only on change with handlers, then organize it all into a role and encrypt secrets with Vault.
Infrastructure as Code · 10 min
Getting Started with Ansible: Install, Inventory and Ad-hoc Commands
Install Ansible in a Python virtual environment, connect Vagrant VMs with passwords and SSH keys, write a first inventory and manage packages with ad-hoc commands.
CI/CD · 14 min
Jenkins Distributed Builds with Agents and Labels
Connect two Vagrant VMs to Jenkins as SSH agents, use labels to choose where each stage runs, and ship a Java app and a Node.js app across separate nodes.
Git & GitHub · 9 min
Git Introduction: Version Control, Setup and Branching
Why version control matters, how local, centralized and distributed VCS differ, how Git works, how to connect to GitHub over HTTPS or SSH, and Gitflow branching.
Infrastructure as Code · 8 min
Vagrant for Local VMs: Vagrantfile, Commands and SSH Shortcuts
Create and manage VirtualBox VMs with Vagrant: an Ubuntu 24.04 Vagrantfile, daily commands, synced folders, provisioning, and SSH config and aliases to reach VMs from anywhere.
Linux · 7 min
Introduction to Linux: Kernel, Shell, File System and SSH Login
The Linux foundations behind DevOps work: kernel and shell, distributions, the directory layout, the seven file types, and SSH login to a VirtualBox VM.