Linux Admin Training in Goregaon Mumbai | RHEL Course

LINUX

Omega replica

This is your chance to make the most of Linux. Whether you recently typed “What is Linux?” into your search history or currently lead teams of IT professionals that have been building on this beloved operating system for years...

KEY FEATURES

Curriculum

What you will learn — lecture by lecture

28 practical modules covering the full classroom syllabus.

Lecture 01Basic Commands / Structure

Navigating the Filesystem using Linux commands
Managing files using commands (cat, find, chmod)
System Monitoring and Management
Managing and configuring Network through Commands
Package management on Red Hat-based system (yum, rpm, dnf)
File compression and archiving (tar, gzip, zip, unzip)
Ubuntu Installation Commands
Installation — 3 methods
RHEL 6, 7, 8, 9 — distinguish versions

Lecture 02Editor — Vi/Vim, Nano

Nano editor, Vi/Vim Editors
Editing files in insert mode
Understanding visual mode
Difference between vi and vim
Understanding how to navigate around files
Command abbreviation
Performing backup and recovery
Opening multiple file tabs

Lecture 03Ownership & Permission

Creating and managing user accounts and their groups
Securing sensitive files and directories
Differences between traditional permissions and ACLs
Symbolic notation (reading and interpreting permission symbols)
Implementing least privilege for users and groups
Troubleshooting permissions issues

Lecture 04Find / Locate / Grep

FIND — Basic file searching with find
Searching by file type (directories, regular files) and filtering
Advanced file searching with find
LOCATE — Locating files with locate
Limiting search to specific directories, filtering search results
Executing commands on search results
GREP — Searching inside files for text patterns
Searching in multiple files and different file types
Recursive searching in directories
Searching system logs (finding error messages, filtering log entries)

Lecture 05Backup Folders and Files using cp, mv and rsync

Copying multiple files and directories using cp
Backing up data to external storage using rsync
Synchronizing directories (local and remote synchronization)
Handling large directory structures efficiently using mv
Migrating data between disks or partitions

Lecture 06FSH — File System Hierarchy

Understanding the root directory (/): role, significance and structure
/bin and /sbin directories and differences between them
System directories and their purpose (/root, /tmp and temporary file storage)
Virtual filesystems for process and system information
Understanding differences between distributions
Package management and its impact on FSH
Understanding links and mount points
Differences between symbolic and hard links
Creating and managing links
Mounting and unmounting filesystems

Lecture 07Symlinks & Hardlinks

Differences between hard links and symbolic (soft) links
Advantages and use cases of hard and symbolic links
Characteristics of hard links (shared inode numbers, same physical files)
Modifying and deleting hard-linked files
Finding and fixing broken symbolic links

Lecture 08fdisk — Disk Manage

Understanding disk devices in Linux
Command-line options and arguments
Partitioning disks with fdisk (primary and extended partitions)
Partition management with fdisk
Resizing existing partitions
Converting partition table types
Persisting mounts in /etc/fstab

Lecture 09Advance Permission

Access Control Lists (ACLs): setfacl, modifying and removing ACL entries
Managing default ACLs
Extended attributes
Changing attributes with chattr
Setting special permissions using chmod
Purpose and significance of setuid, setgid and sticky bit
Using default permissions and umask
Interaction between encryption and file permissions
Automating permission management tasks

Lecture 10Sudoers

Location and structure of the sudoers file
Granting sudo (root) access to a user
Managing group-based permissions with sudo
Understanding Cmnd_Alias, User_Alias, Host_Alias, and Runas_Alias
Restricting specific commands for users

Lecture 11Umask & PATH

Understanding umask notation (octal vs symbolic)
Calculating effective permissions using umask
Setting and modifying umask (permanent and temporary)
How PATH is used to locate executable files (absolute and relative path)
Managing the PATH variable
Removing directories from the PATH
Setting PATH for all users and individual users
Identifying and debugging common umask and PATH issues

Lecture 12Process & Daemons

Managing processes using PID
Listing processes using ps
Identifying resource usage (CPU, memory, etc.)
Sending signals to processes (kill)
Process management and job control
Monitoring processes (top, htop)
Server health check — monitor CPU, memory and load
Daemon management and configuration
Using systemctl to manage systemd services
Troubleshooting daemon startup issues
Init systems and daemon management (systemd, cron)

Lecture 13Cron

Managing cron jobs using crontab
Using cron to run scripts
Syntax for specifying time intervals
Backing up cron configurations
Troubleshooting cron issues

Lecture 14Archive & Compression

File archiving with tar and zip
Compression with gzip and bzip2
Advanced compression techniques
Archive and compression tools comparison
Compression formats and compatibility
Security implications of compression
Creating and extracting compressed archives for different use cases

Lecture 15Networking

Configuring network interfaces (ifconfig, ip command)
Configuring network settings in Linux files
Automating and managing network connections
Configuring DNS servers
Configuring hostname resolution
Understanding network routing concepts
Understanding NAT concepts
Network monitoring and troubleshooting
Troubleshooting hostname — /etc/hosts, /etc/resolv.conf
Gateway, routes, subnets, aliasing

Lecture 16Ports & Protocol

Understanding ports and protocols
Common network protocols (TCP, UDP, ICMP, etc.)
Network troubleshooting and diagnostics
Port scanning and services identification
Security considerations when opening ports
Common network services and their default ports (SSH, HTTP, FTP)

Lecture 17RPM

Components of an RPM package
RPM package management
Querying RPM packages
Setting up an RPM build environment
RPM package scripting
Creating RPM package repositories
Features and advantages of yum over traditional packaging

Lecture 18Yum

Features and advantages of yum over traditional package management
Installing and removing packages with yum
Configuring yum repositories
Resolving dependency issues with yum
Advanced yum commands
Understanding yum configuration files
Troubleshooting with yum
Automating package installations and updates with yum

Lecture 19LVM & User Management

LVM components — Physical Volumes (PV), Volume Groups (VG), Logical Volumes (LV)
Configuring Physical Volumes (PV)
Creating and modifying Volume Groups (resizing, adding/removing PVs)
Moving logical volumes between volume groups; splitting and merging VGs
Resizing Logical Volumes — lvextend and lvreduce
Adding disks to a Volume Group
Removing PV, VG and LV
Types of users — system users, regular users, root and superuser privileges
UID and GID — user and group identifiers
Adding, deleting and modifying user accounts
Managing user passwords
Primary and secondary groups
Advance permissions — SUID, SGID, sticky bit

Lecture 20Troubleshooting

Kernel boot problems — kernel panics, rescue mode
Bootloader issues — GRUB configuration
Filesystem errors and repair — identifying disk issues
Checking and repairing filesystems with fsck
Ctrl+D / maintenance mode

Lecture 21SELinux

Understanding SELinux policies
SELinux configuration
SELinux troubleshooting
SELinux modes — Enforcing, Permissive, and Disabled
SELinux policies — Targeted, Minimum, MLS (Multi-Level Security)
Key components and configuration files
Configuration in file permissions

Lecture 22SSH

Installing and configuring SSH
Connecting to remote systems
SSH key management — ssh-keygen
Copying public keys to remote systems
Enhancing SSH security — disabling root login
Configuring AllowUsers and DenyUsers

Lecture 23Boot Process

BIOS/UEFI initialization
Configuration files for boot loaders
Kernel initialization process
Kernel parameters and their significance
Service management and dependency resolution
Troubleshooting GRUB configuration errors
Recovery options and rescue environments
Analyzing boot logs and diagnosing boot issues

Lecture 24NFS — Network File Sharing

What is NFS and when to use it for shared storage across Linux servers
NFS server and client roles — exporting directories and mounting remote shares
Key files: /etc/exports on server and /etc/fstab or mount options on client
Common NFS versions (NFSv3 / NFSv4) and practical differences
Permissions, UID/GID mapping and firewall ports used by NFS
Hands-on: export a share, mount it on a client, verify read/write access
Troubleshooting: showmount, rpcinfo, stale file handles and permission denied

Lecture 25FTP — File Transfer Protocol

What is FTP and how it differs from SCP/SFTP for file transfer
Active vs passive mode and why passive mode matters behind firewalls
Installing and configuring a basic FTP service (e.g. vsftpd)
Anonymous vs authenticated FTP and securing user home directories
FTP vs FTPS vs SFTP — which to choose for production
Hands-on: upload/download files, restrict users, check logs
Security best practices: disable clear-text where possible, chroot users, limit write access

Lecture 26Samba — File Server

What is Samba — sharing Linux files/printers with Windows clients (SMB/CIFS)
Samba service components (smbd, nmbd) and main config file smb.conf
Creating a shared folder, setting Linux permissions and Samba user accounts
Workgroup vs domain join concepts at a practical admin level
Access from Windows and Linux clients; mapping network drives
Hands-on: create share, connect from Windows, verify read/write
Troubleshooting: testparm, smbstatus, SELinux/firewall issues with Samba

Lecture 27Firewall / iptables — Firewall Service

Why a host firewall matters — allow only required services
firewalld vs iptables/nftables — concepts admins use on RHEL/Ubuntu
Zones, services and ports in firewalld; permanent vs runtime rules
iptables basics: chains (INPUT/OUTPUT/FORWARD), ACCEPT/DROP, order of rules
Allowing common services (SSH, HTTP/HTTPS, NFS, Samba) safely
Hands-on: open/close ports, reload rules, verify with ss/nmap from another host
Troubleshooting: locked-out SSH, rule order mistakes, NAT/masquerade overview

Lecture 28Apache — Static Web Server

What is Apache HTTPD — serving static websites and files on Linux
Install/start/enable httpd (or apache2) and check service status
DocumentRoot, index files and basic Directory permissions
Virtual hosts — hosting multiple sites on one server
Access and error logs — where to look when pages fail
Hands-on: deploy a simple static HTML site, open firewall port 80/443
Basics of HTTPS readiness (certificates overview) and common 403/404 fixes