A comprehensive collection of Linux system administration knowledge, covering everything from basic concepts to advanced enterprise-level configurations. This repository serves as both a learning resource and a practical reference guide for system administrators, DevOps engineers, and Linux enthusiasts.
- 🎯 Red Hat Certification Tracks
- 🤖 Automation & Configuration Management
- 💾 Backup & Recovery Solutions
- 🔨 Build Systems & Compilation
- 🔐 Security & Encryption
- 🌐 Networking & Network Management
- 📦 Virtualization & Containerization
- 📊 System Monitoring & Performance
- 👥 User & Group Management
- 💿 File Systems & Storage Management
- ⚙️ Kernel & System Internals
- 📜 Scripting & Automation
- 🛡️ Firewall & Security Configuration
- 🚀 Boot Process & System Initialization
- 🔧 Development Tools & Version Control
- 📁 Compression & Archiving
- 🌍 GIS & Specialized Applications
- ⚡ Command Line Tools & Utilities
- 🗂️ Package Management
- 🔍 System Diagnostics & Troubleshooting
This repository contains comprehensive materials aligned with Red Hat System Administration certification paths:
Foundational course introducing Linux and RHEL environment:
- Introduction to Linux and RHEL Ecosystem
- Command-Line Proficiency -
bash-shortcuts.md - File Management and Security -
file-system/file-system-security.md - User and Group Management -
user-and-group/ - System Services Management with systemd -
init_systems/system_d/ - Remote Access Configuration -
ssh/ - Network Configuration -
networking/ - Software Management with DNF -
packages/dnf_yum/
Advanced system administration techniques:
- RHEL Installation -
installation-modes.md - Security and File System Management -
file-system/file-system-permissions.md - Shell Scripting and Automation -
scripts/scripting-notes/ - Storage Device and File System Management -
LVM/,file-system/ - System Security Management -
selinux/,firewall/ - Boot Process and Service Control -
boot/,grub/ - Container Management -
virtualization/docker/
Validates comprehensive system administration skills with practical examples and labs.
Complete Ansible automation framework:
ansible/readme.md- Repository setup and best practicesansible/ansible-introduction.md- Getting started guideansible/group_vars.md- Variable managementansible-inventory.md- Inventory configuration
Key Features:
- Playbook organization and structure
- Role development and management
- Inventory management for multiple environments
- Variable management and group configurations
Comprehensive backup strategies for Linux servers:
backups/README.md- Complete backup strategies overviewbackups/deja-dup.md- GUI backup tool for desktopsbackups/webserver_backup_guide.md- Web server specific backups
- tar: Archive and compress files
- rsync: Efficient incremental backups
- dd: Full disk backups and cloning
- Cloud Solutions: AWS S3, Google Drive, Dropbox
- Database Backups: MySQL, PostgreSQL
- Enterprise Solutions: Bacula, Duplicity
LVM/LVM_snapshot.md- Creating and managing LVM snapshotsLVM/backup_lvm_snapshot.md- Backup strategies using LVM
Understanding software compilation and build processes:
built/1.build.md- Complete build process guidebuilt/configure.md- Configure scripts and autotoolsbuilt/autoconf-vs-automake.md- Build system comparisonbuilt/cross-compilation.md- Cross-platform compilationbuilt/gcc_vs_clang.md- Compiler comparisonbuilt/Make-Parallel-Compilation.md- Parallel compilation optimizationbuilt/debugging_symbols_and_stripping.md- Debug information management
built/chroot.md- Chroot environments for buildingbuilt/patching.md- Source code patchingbuilt/shared_object_file.md- Dynamic library managementbuilt/ldd_library_dependencies.md- Library dependency analysis
Comprehensive security configurations and encryption solutions:
encryption-ssl-etc/1.openssl-introduction.md- OpenSSL fundamentalsencryption-ssl-etc/Self-Signed-SSL-Certificate.md- Creating self-signed certificatesencryption-ssl-etc/CSR.md- Certificate Signing Requestsencryption-ssl-etc/lets-encrypt.md- Free SSL certificatesencryption-ssl-etc/certbot.md- Automated certificate management
checksum/README.md- Complete checksum guidechecksum/checksum-scripting/- Automated verification scripts
selinux/1.Introduction_selinux.md- SELinux fundamentalsselinux/Sensitivity_Levels.md- Security level management
encryption-ssl-etc/luks-encryption.md- LUKS full disk encryption
Complete networking stack configuration and management:
networking/1.network-management-tools.txt- Comprehensive tool overviewnetworking/network-management-tools.txt- Network utilities comparison
networking/configure_static_ip_in_RHEL_based_new.md- Modern RHEL networkingnetworking/configure_static_ip_in_RHEL_based_old.md- Legacy RHEL networkingnetworking/netplan.txt- Ubuntu Netplan configuration
networking/ip-suite/- Modern IP command suitenetworking/ss_command.md- Socket statisticsnetworking/Netcat.md- Network debugging toolnetworking/nmap.md- Network discovery and security auditing
dns/systemd-resolved.md- Modern DNS resolutiondns/resolve.conf.md- Traditional DNS configurationdns/dns_solutions.md- DNS troubleshooting
networking/IPv4_forwarding.md- IP forwarding configurationnetworking/ebtables.md- Ethernet bridge filteringbr_netfilter.md- Bridge netfilter configuration
Modern containerization and virtualization technologies:
virtualization/docker/1.docker-installation/- Installation guidesvirtualization/docker/build-image.md- Custom image creationvirtualization/docker/docker_build/- Advanced building techniquesvirtualization/docker/gpu/gpu_in_docker.md- GPU acceleration
virtualization/KVM.md- Kernel-based Virtual Machinevirtualization/libvirt.md- Virtualization managementvirtualization/Live_Migration_of_VMs_in_KVM.md- VM migration
virtualization/singularity/- Singularity containers for HPCvirtualization/singularity/gpu_in_singularity_container.md- GPU support
Comprehensive system monitoring and performance optimization:
monitoring/1.system-monitoring.md- System performance monitoringmonitoring/2.network-monitoring.md- Network performance trackingmonitoring/3.disk-monitoring.md- Storage performance analysismonitoring/4.log-monitoring.md- Log analysis and monitoringmonitoring/5.advance-monitoring.md- Advanced monitoring strategies
monitoring/top-htop.md- Process monitoringmonitoring/glances.md- System overview toolmonitoring/watch.md- Command execution monitoring
file-system-monitoring/- File system change monitoringfile-system-monitoring/monitor.sh- Automated monitoring scripts
optimization/- System optimization techniquesoptimization/cpu_frequency.md- CPU frequency scalingoptimization/nice.md- Process priority management
Complete user and group administration:
user-and-group/1.users-and-groups.md- Fundamentalsuser-and-group/2.create-users.md- User creationuser-and-group/3-creating-groups.md- Group management
- Password policies and security
- User authentication and authorization
- Group-based permissions and access control
- Service accounts and system users
Advanced storage and file system management:
LVM/README.md- Comprehensive LVM guideLVM/LVM-resize-guide.md- Volume resizingLVM/Convert_Standard_Partition_to_LVM- Migration guide
file-system/file-system-permissions.md- Permission managementfile-system/ntfs.txt- NTFS support in Linuxfile-system/tmpfs_md- Temporary file systemsfile-system/OverlayFS.md- Overlay file systems
file-system/resize2fs.md- File system resizingfile-system/fallocate.md- Disk space allocationfile-system/quota-configure.md- Disk quota management
file-system/NFS-Server-Installation.md- NFS setupfile-system/CIFS-mount.txt- SMB/CIFS mounting
Deep dive into Linux kernel and system internals:
kernel/kernel-types.md- Different kernel types and use caseskernel/multiple-kernels.md- Managing multiple kernelskernel/kernel-panic.md- Troubleshooting kernel panicskernel/dmesg.md- Kernel message analysis
kernel/DKMS.md- Dynamic Kernel Module Supportbuilt/kernel_modules/DKMS.md- Module buildingmodprobe.md- Module loading and management
kernel/sysctl.md- Runtime kernel parameterssysctl.md- System tuning
devices/README.md- Complete device management guidedevices/udev_rules.md- Device rule configurationdevices/loop_device.md- Loop device management
Comprehensive scripting and automation resources:
scripts/scripting-notes/1.what-is-scripting.md- Scripting fundamentalsscripts/scripting-notes/case.md- Case statementsscripts/scripting-notes/bash_vs_expect.md- Scripting comparison
shell/bash-completion.md- Command completionshell/prompt_PS1.md- Prompt customizationexpansions/- Shell expansions and variable handling
scripts/server-stats.sh- System statistics scriptduplicate-finder/- File duplicate detection scriptsdisk/disk-usage.sh- Disk usage monitoring
Network security and firewall management:
firewall/firewalld.md- Modern firewall managementfirewall/ufw.txt- Ubuntu firewall configurationfirewall/pfsense.md- pfSense firewall
firewall/types-of-firewall.txt- Firewall types and conceptsfirewall/vpn-in-firewalls.md- VPN integration
Understanding and managing the boot process:
boot/boot_directory.md- Boot directory structureboot/boot_parameters.md- Kernel boot parametersinitrd.image.md- Initial RAM disk
grub/1.grub.md- GRUB bootloader configurationgrub/update-grub.md- GRUB updates and maintenance
init_systems/system_d/README.md- Systemd initializationinit_systems/openrc/README.md- OpenRC systeminit_systems/system_v/inittab.md- SysV init
kernel/repair-kernel.md- Kernel repair proceduresmemtest.md- Memory testing during boot
Development environment and version control systems:
git/git.md- Comprehensive Git tutorialgit/git-lfs.md- Large file storagegit/git-stash.md- Stashing changesgit/pull_new_remote_branches.md- Branch management
conda/- Conda environment managementpip/- Python package managementyarn-javascript.md- JavaScript package management
gitlab/gitlab-installation.md- GitLab setupgit/vcstool.md- Version control tools
File compression and archiving utilities:
compression/README.md- Complete compression guidecompression/tar.md- TAR archivingcompression/xz.md- XZ compression
Tools Covered:
- gzip, bzip2, xz compression algorithms
- ZIP cross-platform archives
- TAR archiving with compression
- Parallel compression tools (pigz, pbzip2)
Geographic Information Systems and specialized software:
qgis/- Complete QGIS setup and configuration- Custom installation scripts for Windows environments
- Library and dependency management
- Plugin and adapter configurations
Essential command-line tools and utilities:
grep.md- Pattern searchingtr.md- Character translationtee.md- Output redirectionenvsubst.md- Environment variable substitution
find_and_exec.md- Finding and executing commandsSymbolic-Link.md- Symbolic link managementuuid.md- UUID generation and handling
uname.md- System informationtype.md- Command type identificationgetent.md- Name service queries
processes/- Process management toolsjob-control.md- Job control in shellkill-command.md- Process terminationnohup.md- Background process execution
redirection/- Input/output redirectionfile-descriptors.md- File descriptor managementstandard-output-and-error.md- Output handling
Package management across different distributions:
packages-apt/- Comprehensive APT managementpackages-apt/apt-commands- Command referencepackages-apt/dpkg-commands.md- Low-level package management
packages/dnf_yum/- DNF package managementpackages/dnf_yum/locking_version.md- Version pinning
snap/README.md- Snap package managementdistribution_arch/pacman.md- Arch Linux pacman
offline_linux_packages.md- Installing packages without internet
Comprehensive troubleshooting and diagnostic tools:
centos-repository-errors.md- CentOS repository troubleshootingmigration-linux-servers/- Server migration guides
GPU/- GPU management and troubleshootingdrivers/ubuntu/- Ubuntu driver management
clamav.md- Antivirus configurationLine-Ending-Errors-in-Linux.txt- File format issues
- Start with User & Group Management
- Learn Command Line Tools
- Understand File Systems basics
- Practice with Basic Scripting
- Master Networking
- Learn System Monitoring
- Understand Security basics
- Practice Backup strategies
- Deep dive into Kernel & System Internals
- Master Virtualization
- Learn Automation
- Understand Performance Optimization
- Follow the Red Hat Certification Tracks systematically
- Practice all hands-on examples in each section
- Focus on troubleshooting scenarios and real-world applications
This repository welcomes contributions! Whether you're:
- Adding new documentation
- Improving existing guides
- Fixing errors or typos
- Adding practical examples
Please feel free to submit pull requests or open issues for discussion.
- System Monitoring Tools - For performance troubleshooting
- File System Permissions - For access issues
- Network Management - For connectivity problems
- LVM Guide - For storage management
- Bash Scripting - For automation
This repository is continuously updated with new content and improvements. For the most current information and additional resources, check the individual README files within each directory.
Happy Learning! 🐧✨