Linux & System Administration

Linux file ownership and permissions diagram: user/group/others; read, write, execute bits; symbolic rwx vs numeric chmod; change owner/group with chown, chgrp. including octal 0-7

Graphic showing Linux commands df -h and du -sh /path, illustrating filesystem summary vs directory sizes, example outputs, key columns, and tips to locate largest files. Use du/df

Linux administration is evolving from manual tasks to platform-driven roles managing containerized workloads. Future admins must master Kubernetes, eBPF security, AI automation, and GitOps while balancing efficiency with governance in cloud-native environments.

Comprehensive step-by-step Linux boot troubleshooting guide for system administrators and advanced users. Covers BIOS/UEFI issues, GRUB bootloader problems, kernel panics, systemd failures, encrypted LVM setups, and hardware diagnostics with safe recovery methods.

Managing file systems and partitions in Linux requires proper planning and tool selection. Use GPT for modern disks, choose ext4 for general use or XFS for large throughput. Prefer UUID-based fstab entries, implement LVM for flexibility, and LUKS for encryption.

SELinux and AppArmor are Linux Mandatory Access Control systems that limit process actions beyond user privileges. SELinux uses label-based fine-grained control, while AppArmor uses simpler path-based policies. Both prevent privilege escalation and protect systems.

Automate Linux backups with Bash scripts and cron jobs. Complete guide covers compression, encryption, remote storage, retention policies, database dumps, security best practices, and restore procedures for reliable data protection.

Master Bash scripting for daily system automation tasks including backups, log rotation, disk cleanup, package updates, and monitoring. Learn security best practices, error handling, cron scheduling, and testing methods for reliable production scripts.

A comprehensive guide to essential Linux server administration tools for system administrators and DevOps engineers. Covers monitoring, security, automation, troubleshooting, and best practices with practical commands and real-world workflows.

A comprehensive guide for securing Linux systems in 2025, covering threat landscape changes, zero trust principles, container security, supply chain protection, and practical hardening checklists for enterprises across cloud and on-premises environments.

Learn how to configure Linux network interfaces using various tools like netplan, NetworkManager, systemd-networkd, and ifupdown. Covers DHCP, static IP setup, DNS configuration, routing, VLANs, bridging, IPv6, and troubleshooting commands for all major Linux distributions.

Comprehensive guide to Linux log management covering syslog journald auditd configuration centralization with ELK Graylog troubleshooting workflows security compliance automation for system administrators SREs DevOps engineers with practical exercises