Linux
Linux operating system administration and security
Linux is an open-source operating system kernel that forms the basis for numerous distributions used in servers, containers, embedded systems, and security tools.
Key Skills
- Command Line - Shell navigation and scripting
- File Systems - Permissions, ownership, structure
- Process Management - Services, daemons, scheduling
- Package Management - apt, yum, dnf, pacman
- Networking - Configuration, firewalls, services
Security Hardening
- User and group management
- SELinux and AppArmor
- Firewall configuration (iptables, nftables, firewalld)
- SSH hardening
- Audit logging and monitoring
- File integrity monitoring
Common Distributions
- Red Hat Enterprise Linux / CentOS / Rocky Linux
- Ubuntu / Debian
- SUSE Linux Enterprise
- Kali Linux (security-focused)
- Alpine Linux (containers)
Security Applications
Linux is the platform of choice for:
- Security tools and penetration testing
- Server infrastructure
- Container hosts
- Network appliances
- Security research
