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System Administration

Practical guides for Linux system administrators covering user management, networking, security, storage, and server configuration.

User & Access Management

Guides on managing users, groups, and access controls on Linux systems. Topics include sudo configuration, SSH key-based authentication, restricting remote access, and enforcing password policies across multi-user environments.

  • User and group creation, modification, and deletion
  • Configuring sudoers for fine-grained privilege escalation
  • SSH access control, key management, and hardening
  • Account locking, expiration, and audit logging

Network Configuration

Step-by-step tutorials for configuring Linux networking from the command line and through configuration files. Covers static IP assignment, DNS resolution, routing tables, and firewall rule management.

  • Setting a static IP address on Linux and Unix systems
  • Configuring static IP and DNS on FreeBSD
  • Finding the default gateway IP address from the command line
  • Displaying network information with tools like whatip
  • Working with ip, ifconfig, and NetworkManager TUI (nmtui)
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Disk & Filesystem Management

Tutorials on partitioning, formatting, mounting, and maintaining storage on Linux servers. Includes working with LVM, managing disk quotas, and performing filesystem checks and repairs.

  • Creating and resizing partitions with fdisk and parted
  • Logical Volume Manager (LVM) setup and administration
  • Mounting local and network filesystems (NFS, SMB)
  • Disk usage analysis, cleanup, and quota enforcement

Backup & Recovery

Strategies and tools for backing up Linux systems and recovering from failures. Covers both file-level and system-level backup approaches using built-in utilities and open-source solutions.

  • Using rsync, tar, and dd for backups
  • Scheduling automated backups with cron and systemd timers
  • Disaster recovery planning and bare-metal restore procedures
  • Verifying backup integrity and testing restore workflows

Monitoring & Performance Tuning

Guides for keeping Linux servers healthy and responsive. Learn to monitor system resources, interpret performance metrics, and tune kernel parameters for your workloads.

  • Real-time monitoring with top, htop, vmstat, and iostat
  • Analyzing logs with journalctl and syslog
  • CPU, memory, and I/O bottleneck identification
  • Kernel parameter tuning via sysctl
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System Hardening & Security

Practical security guides to harden Linux servers against common threats. Covers firewall configuration, service lockdown, SELinux and AppArmor policies, and intrusion detection basics.

  • Firewall management with iptables, nftables, and firewalld
  • Managing and deleting IP address rules in iptables
  • Securing services with systemd sandboxing and resource limits
  • Applying security updates and minimizing the attack surface