AWS: Simple and Secure Architecture
How to deploy a secure VPC on AWS with EC2, Bastion Host, NAT Gateway, and ELB from scratch.
#servers
7 posts
Magic Commands: Grep!
A practical guide to grep with real examples: filtering logs, searching patterns, regex and bash scripting.
Magic Commands: Find!
A practical guide to find with real examples: searching by name, type, user, permissions, and executing actions.
Installing Packages on CentOS Offline
How to install RPM packages with all their dependencies on an internet-restricted CentOS server using repotrack and createrepo.
What is SSH?
An introduction to SSH: what it is, how encryption works, and why it replaced Telnet as the standard for remote server management.
SSH: Public Key Authentication
How SSH public key authentication works, how to generate ECDSA and RSA key pairs, and how to deploy them to your server securely.
Configuring the SSH Server
A practical guide to hardening sshd_config: disable root login, enforce key-only auth, restrict users, and tune the most important SSH server settings.