Learn Linux, AWS & DevOps

Linux Administration: The Complete Field Guide

Filesystem hierarchy, permissions, users & groups, systemd, journald, cron, networking, SSH hardening, disk management, LVM, and RHCSA exam tips.

Linux File Permissions, Ownership & umask Explained

The rwx permission model, chmod symbolic vs. octal notation, chown/chgrp, setuid/setgid/sticky bits, and how umask sets your defaults.

Docker in Production: Images, Volumes, Networks & Compose

Containers, images, volumes, networks, Dockerfiles, Compose stacks, private registries, and the troubleshooting playbook for production containers.

SSH Hardening: Key-Based Auth, Fail2ban & Bastion Hosts

Disabling password auth, key-based login, sshd_config hardening, fail2ban jails, and bastion-host architecture for production access.

AWS IAM Fundamentals: Users, Roles, Policies & Least Privilege

Users vs. roles vs. groups, identity-based vs. resource-based policies, policy evaluation logic, and applying least privilege in practice.

AWS for DevOps: IAM, EC2, VPC, S3 & Deployment Patterns

IAM, EC2, S3, Route53, CloudFront, ACM, RDS, CloudWatch, VPC, ALB, and Security Groups — with real deployment architectures and interview questions.

Linux Administration: The Complete Field Guide

Filesystem hierarchy, permissions, users & groups, systemd, journald, cron, networking, SSH hardening, disk management, LVM, and RHCSA exam tips.

Linux File Permissions, Ownership & umask Explained

The rwx permission model, chmod symbolic vs. octal notation, chown/chgrp, setuid/setgid/sticky bits, and how umask sets your defaults.

Docker in Production: Images, Volumes, Networks & Compose

Containers, images, volumes, networks, Dockerfiles, Compose stacks, private registries, and the troubleshooting playbook for production containers.

SSH Hardening: Key-Based Auth, Fail2ban & Bastion Hosts

Disabling password auth, key-based login, sshd_config hardening, fail2ban jails, and bastion-host architecture for production access.

Git Mastery: Branching, Rebasing & GitHub Workflows

Git internals, branching, merging, rebasing, cherry-picking, stashing, resetting, reverting, tagging, Git Flow, and resolving merge conflicts for real.

AWS IAM Fundamentals: Users, Roles, Policies & Least Privilege

Users vs. roles vs. groups, identity-based vs. resource-based policies, policy evaluation logic, and applying least privilege in practice.

Linux Administration: The Complete Field Guide

Filesystem hierarchy, permissions, users & groups, systemd, journald, cron, networking, SSH hardening, disk management, LVM, and RHCSA exam tips.

Docker in Production: Images, Volumes, Networks & Compose

Containers, images, volumes, networks, Dockerfiles, Compose stacks, private registries, and the troubleshooting playbook for production containers.

Git Mastery: Branching, Rebasing & GitHub Workflows

Git internals, branching, merging, rebasing, cherry-picking, stashing, resetting, reverting, tagging, Git Flow, and resolving merge conflicts for real.

AWS for DevOps: IAM, EC2, VPC, S3 & Deployment Patterns

IAM, EC2, S3, Route53, CloudFront, ACM, RDS, CloudWatch, VPC, ALB, and Security Groups — with real deployment architectures and interview questions.

Linux File Permissions, Ownership & umask Explained

The rwx permission model, chmod symbolic vs. octal notation, chown/chgrp, setuid/setgid/sticky bits, and how umask sets your defaults.

SSH Hardening: Key-Based Auth, Fail2ban & Bastion Hosts

Disabling password auth, key-based login, sshd_config hardening, fail2ban jails, and bastion-host architecture for production access.

Linux File Permissions, Ownership & umask Explained

The rwx permission model, chmod symbolic vs. octal notation, chown/chgrp, setuid/setgid/sticky bits, and how umask sets your defaults.

Cron & systemd Timers: Scheduling Jobs in Linux

Crontab syntax, special strings, run-parts directories, and modern systemd timer units — with a direct comparison of when to use each.

SSH Hardening: Key-Based Auth, Fail2ban & Bastion Hosts

Disabling password auth, key-based login, sshd_config hardening, fail2ban jails, and bastion-host architecture for production access.

LVM: Logical Volume Management from Scratch

Physical volumes, volume groups, and logical volumes — creating, extending, and shrinking storage without unmounting production filesystems.

AWS IAM Fundamentals: Users, Roles, Policies & Least Privilege

Users vs. roles vs. groups, identity-based vs. resource-based policies, policy evaluation logic, and applying least privilege in practice.

EC2 Instance Types & Purchasing Options

Instance family naming (m6i, c7g, r6g), On-Demand vs. Reserved vs. Spot vs. Savings Plans, and picking the right combination for a real workload.