Course Overview

Course Overview

Installing and accessing a Linux system

Install VirtualBox
Download CentOS Linux
Install CentOS Linux
Download, Install and connect through putty
Install Red Hat 8 with Custom Partitioning on VirtualBox
Download SUSE LINUX Enterprise Server
Install SLES 15 (SuSE Linux Enterprise Server)
Install SLES 12 SP3 with expert partitioning on VirtualBox
Different ways of accessing your Linux server

Linux Fundamentals

The Linux Directory Structure
The Shell
Basic Linux Commands cd, ls, cat, pwd, and more
Listing Files and Understanding LS Output
Changing Password
Absolute vs relative Path
Finding help at the command line
Creating Files and Directories
Understanding the Basic File and Directory Permissions
Changing File Permissions
Modify File Ownership for user and group
Finding Files in your system
Introduction to vi editor
Copying Directories and Files
Removing Directories and Files
Moving and renaming Directories and Files
Quiz

Intermediate Linux skills

more and less command
head and tail commands
Tab Completion
Command History
Wild Cards
Soft and Hard Links
Input, Output and Error Redirection
grep
pipe
Shell Aliases
echo command
Environment Variables
Connecting from one server to another
Transferring and Copying Files over the Network
Counting Words, Lines and Characters
Viewing and Monitoring Processes
Schedule and automate tasks with Cron
User and group administration
Switching Users
The sudo utility
Compressing and archiving files tar, gzip
Displaying and Setting the Hostname
Find you IP address
tr, sort, diff and uniq command - Text File Manipulation
cut and sort command - Text File Manipulation
32-bit vs 64-bit operating systems
Finding system information (uname, dmidecode)
Root Password recovery
sosreport for Redhat troubleshooting
Monitor Users (who, last w, id)
Message of the day (motd) and wall
Quiz

Software installation - Redhat/CentOS, SUSE, Fedora and UBUNTU

Red-hat/CentOS/Fedora software installation using YUM
Package management using RPM
Introduction to Repositories
Create a Local Repository
System updates and preparation (version lock)
Roll back patches and updates
Installing Software in SUSE Linux using Zypper
Installing software in Ubuntu
Quiz

Managing Users and Groups

User and group administration
Create a User account with No Login Access
The passwd command
Password Aging on User accounts
Create, Modify and Delete Group Accounts
Activating and Deactivating Shadow Password Mechanism
User Authentication Files
The passwd File
The shadow File
The group File
The gshadow File
Switching Users
The sudo utility

Disk and Volume Management (LVM, parted)

Introduction to partitioning and file system
Introduction to LVM - The Logical Volume Manager
Add a new disk through Oracle Virtual Box
Managing Storage with parted
Creating Physical Volumes (PVs), Volume Groups (VGs) and Logical Volumes (LVs)
Extending Volume group (VG) and Logical Volumes (LV)
Mirroring Logical Volumes
Moving Volumes (Data) from one storage to another
Removing Logical Volumes (LVs), Volume Groups (VGs) and Physical Volumes (PVs)

Linux Networking

Network Components
Network Classes
TCP and UDP Protocols
The OSI model
Ping Command
Network Interfaces, configuration files and commands
Find your IP address
Add a Network Adapter through Oracle VM Virtual Box
NIC Bonding

Servers and Services

Apache Web Server
LAMP Server

Linux Security

Firewall and iptables
Linux Server Security

Managing Process

Understanding processes
Viewing and Monitoring Processes
Listing a Specific Process
View Processes by User and Group Ownership
Process States
What is Process Niceness?
Viewing and Changing Process Niceness
Renicing a Running Process
Control Processes with Signals
Job Scheduling
Controlling user access
Scheduler Log file
Scheduling with at command
Submit, view, list and remove an at job
Using crontab
Syntax of User Crontab Files
Add list and remove a Cron job

Linux Technical Interview Prep

Linux Basic Technical questions
System Administration questions - 1
System Administration questions - 2
System Administration questions - 3
Troubleshooting part 1
Troubleshooting part 2
Troubleshooting part 3
1- How to find files that are over 10 MB in size
2- How to show lines containing #
3- Display all lines of a file with line numbers
4- Find system information such as the version or release info
5- Where are the files located for network interfaces?
6- Find an installed package?
7- How to find out total lines in a file without opening that file?
8- How to find disk usage by the largest directories?
9- How to find all directories named conf under /?
10- How to find files not accessed in over 3 days?
11- How to view difference between 2 files?
12- Which system configuration files should be backed up regularly?
13- How to view currently logged in users?
How to extend SWAP space?
How to extend a logical volume?
How to reduce the logical volume and is it possible to reduce it on the fly?
How to scan disks for existing volume group and logical volume?
How to activate, deactivate, disable/enable a logical volume and a volume group?
What is the default size of a physical extent in LVM?
List the available logical, physical volumes info in detail
How can you show all lines except any lines starting with the #?
How can you continuously monitor log files for errors?
Remove files older than 7 days automatically by creating a cron job
How to list all created users on the system and send(redirect) them to a file?
How to list only the 2nd column from a file?
How to broadcast a message to all logged -in users
How to schedule a server reboot in 15 minutes
How to prevent users from deleting other users files in a directory
How to display 10th line of a file?
How to restore a hacked server?
How to secure a newly built server?
Which file is the most commonly known to check for log messages?
How and why to disable ping?
Explain the different fields in passwd file
Which command can tell how long the system has been running?
How to check if a port is listening?
Server down troubleshooting
How to find all files in bin with specified (755) permissions?