Linux Signals (SIGTERM, SIGINT, SIGKILL)
How shutdowns and kills affect apps.
LINUX
Permissions in Container Volumes
Handle file access issues inside containers.
Disk Usage and Cleanup (df, du, ncdu)
Avoid system crashes due to full disks.
Logs and journalctl
Read and understand logs to debug like a ninja.
Performance Tools (top, htop, iostat)
Quickly check CPU, memory, and IO performance.
Building from Source (make, gcc)
Compile and install from source when needed.
Linux Package Management (APT, DNF)
Install, remove, and manage packages like a pro.
Firewall Management (UFW/nftables)
Lock down access to your cloud-hosted apps.
SSH Configuration and Port Forwarding
Secure and flexible remote access and tunnels.
Understanding DNS and Name Resolution
How DNS and /etc/hosts affect your services.