Key-based auth, hardening sshd_config, and tunneling.
Prerequisites
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 Interview Questions & Answers
Real questions asked in Linux SysAdmin, DevOps, and RHCSA-track interviews — filesystem, permissions, systemd, networking, storage, and troubleshooting.
Linux Fundamentals
Core concepts: the shell, commands, filesystem hierarchy, and how distributions differ.
Filesystem
The FHS layout, mount points, inodes, and navigating the filesystem like an administrator.