Linux Administration with Troubleshooting Skills - Hands On

By the end of the course you will:

• Be able to confidently use the Linux operating system to increase your productivity and Career.

• Be able to perform everyday computing tasks from the Linux command line.

Course Content

 Linux basic concepts,Introduction & History of Unix/Linux                                             

• Introduction to Unix

• History of UNIX  

• What is LINUX 

• History of Linux 

• LINUX Distributions  

• Unix File System

Linux Commands Tutorials

• Lecture on various commands with proper explanation with examples on live environment.

• Overview of File System Structure

• pwd, cd, ls, less, cp, file mkdir. more. mv, cat, rm rmdir, wc, dd, head, tail, touch, ln etc

Bash profile, Variables & Standard Input output Redirecting

• User's home directory

• .bash_profile, .bashrc & .bash_logout

• How to set PATH & alias in .bashrc profile

• Familiar with Variables

• Bash variable, Environmental variable & System Variables

• Lab

• Standard Input & Output Redirecting ( > , 2> ,&> )

• Standard Input and Output

• Redirecting Output to a File 

• Redirecting Output to a File

• Lab

Linux User management

• Understanding different types of groups and creation of groups

• Creation of users in different groups

• Understanding Passwd, Shadow Files

• Understanding passwd aging

• Creation of quotas for users, groups and file systems

• Understanding users security files

• password aging policy using chage commands

• TROUBLESHOOTING

Permissions in Red Hat Linux

• Basic File Permissions

• User Based permissions groups 

• Permission Types

• Change of permissions & ownership 

• Special Permissions  

• Setuid, Setguid, Sticky bit, ACL etc

• Two Labs to demonstrate the permissions from real IT industry environment.

Controlling Access to files with ACLs

• Access Control List Concepts

• Set ACL's on files

• Default ACL

• Practice Lab Session on set acl on files

• Practice Lab Session on set acl on directories

• Practice Lab Session on mask to limit the set of permissions

• Practice Lab Session on default ACL

• Practice Exercise - Scenario based activity

Linux Crontab

• Overview of Linux Crontab & its format

• Schedule a job for a specific period of time 

• Schedule a job for more then one instance (e.g. twice a day)

• Schedule a job for specific range of time

• Schedule a job every weekday during working hours

• how to view crontab entries?

• Schedule a job for every minute using cron

Linux Find Commands

• Basic find commands for finding files with names

• Find files based on their permissions

• Search files based on owners & groups

• Find files and directories based on date & time

• Find files and directories based on size

OpenSSH        

• Overview of OpenSSH

• What Are Some Of The OpenSSH Features?

• OpenSSH options are controlled through the /etc/ssh/sshd_config file

• Lab Session

Telnet 

• Overview about telnet

• Configuration of telnet server on Linux

• Xinetd Service

Process Management

• Understanding ps commands with custom properties & Nice values etc

• Different stats of a process like "D", "S", "T", "Z" etc

• Kill commands to terminate the process

• Lab

Kernel Modules

• What is Kernel & its features

• Kernel Modules

• Commands to manipulate the kernel (insmod,lsmod,modinfo,modprobe &rmmod)

• How to know the name of the module or kernel driver for any deivce like lan

• Lab

Disk Partitions, File Systems Creations & RAID Configuration

• Creating the partitions in a simple disk using fdisk

• Understanding the different options in fdisk utility

• Creating File Sytems using (ext3/ext4/xfs FS)

• Mounting/Umounting FS

• Entry in fstab

• Introduction to RAID

• Concepts & features of RAID

• RAID Level

• How to configure different level of Raids like (0,1,5,6, 10 etc)

• Lab Sessions

Logical Volume Manager Administration

• LVM Architecture Overview

• LVM Components

• LVM Logical Volumes

• Logical Volume Creation Overview

• Growing a File System on a Logical Volume

• Logical Volume Backup

• LVM Administration with CLI Commands

• Using CLI Commands

• Physical Volume Administration

• Creating Physical Volumes

• Displaying Physical Volumes

• Preventing Allocation on a Physical Volume

• Resizing a Physical Volume

• Removing Physical Volumes

• Volume Group Administration

• Creating Volume Groups

• Adding Physical Volumes to a Volume Group

• Displaying Volume Groups

• Removing Physical Volumes from a Volume Group

• Changing the Parameters of a Volume Group 

• Activating and Deactivating Volume Groups 

• Removing Volume Groups

• Overview about LVM Metadata

• Metadata Contents

• How to identify and  recover failed LVM disk

  RPM (Red Hat Package Manager) 

• Install : It is used to install any RPM package.

• Remove : It is used to erase, remove or un-install any RPM package.

• Upgrade : It is used to update the existing RPM package.

• Verify : It is used to query about different RPM packages.

• Query : It is used for the verification of any RPM package.

YUM (Yellowdog Updater, Modified)

• Overview of YUM

• Configuration& and installation of yum on Red Hat Linux Server

• Lab-1

• Lab-2

• Yum History Command

• Reverting and Repeating Transactions like undo & redo using yum command

Linux OS Minor Upgrade

• Linux OS upgrade from RHEL 7.1 to RHEL 7.2

• Lab Practice Sessions

File Transfer Protocol

• Overview of FTP Server

• Installation and configuration of FTP Server

• Lab-1

• Lab-2

Apache Web Server Administration

• Basic Setup

• Verify installation

• Package files

• Main configuration file(s)

• Backup

• Edit the httpd.conf configuration file

• ServerRoot

• PidFile

• ServerName

• Add site to /etc/hosts file

• DocumentRoot

• ErrorLog

• Listen

• Create your HTML documents

• Start the Web Server

• Access the web site

• Local access

• Internal & external access

• Summary of basic setup

DNS (Domain Name System)

• Overview of DNS

• Understanding root & top level domains

• How dns works practically

• What happens when I type any website name in the address bar of the browser

Samba Server

• Overview of Samba Server

• Features of Samba Server

• How Samba Server Works

• Samba File sharing Server

• CIFS File System

• Practice Lab Sessions

Network File System  (NFS) on Linux

• Overview of NFS Server

• Installation and configuration of NFS Server

• Lab-1

• Lab-2

Automating Installation using Kickstart

• Overview of Kickstart Server

• Features of Kickstart Server

• Configuration & Installation of Kickstart Server

• Configuration of dhcp, tftpd, nfs for Kickstart Server

• Configuration of kickstart config file using graphical mode

• PXE Boot Environment

• Lab Session

• Unattended Client boot and do the installation via network

Networking Concepts in Linux

New Sets of commands introduced in RHEL 7 for managing the network interfaces.

• Check the status of ethernet interfaces

• Add and configure the new ethernet interface

• Activate the network services

• Commands to change the network properties of an existing interface

• Delete the ethernet interface

• Learning of various new commands related to managing network interfaces.

• Overview of Routing Table

• Understanding the output of netstat -rn or route -n output

• Lab

Linux Performance Monitoring

• Introduction about Performance monitoring in Linux

• Important four subsystems that needs to be monitored.

1. CPU 
2. Memory
3. I/O
4. Network

• Familiar & understanding with CPU Utilization

• Like Context switches, Run Queue, CPU utilization & Load Average

• Familiar & understanding with Memory Utilization

• Familiar & understanding with I/O Analyses

• Familiar & understanding with Network Monitoring

• Familiar with various Commands to manage performance issues in Linux Servers

• top 

• vmstat

Troubleshooting Linux Boot Problems in Red Hat Linux 6 (Basic System Recovery)

• Simple & step by step understanding of Linux Boot Process ( 2 detailed Sessions)

• Overview of Red Hat Linux 7 and their features

• Comparison of features of RHEL7 with RHEL6

• Lab on Basic System Recovery (Initramfs file missing/Corrupted)

• Lab on Basic System Recovery (Grub related issues like stage 1.5/2 grub is missing)-Part1

• Lab on Basic System Recovery (Grub related issues like stage 1.5/2 grub is missing)-Part2

• Lab on Basic System Recovery (Master Boot Record missing/corrupted)

• Lab on Basic System Recovery (Critical files are missing like mount binary, incorrect entry in fstab etc)

• Lab on Basic System Recovery (Critical files are missing like mount binary, incorrect entry in fstab etc)

Overview of Red Hat Enterprise Linux 7

• Overview about RHEL7 with its new features

• Comparison with RHEL 6

• Lab on systemd service (Familiar with different systemd targets & new commands)

• Rescue mode in RHEL 7

• Lab on rescue mode

• Emergency mode in RHEL 7

• Lab on emergency mode

• Troubleshooting mode (Overview and Lab)

• Lab on Recovering the Root password in RHEL7

  • Resetting the Root Password Using an Installation Disk 

  • Resetting the Root Password Using rd.break

Troubleshooting Linux Boot Problems in Red Hat Linux 7 (Basic System Recovery)

• Lab on Basic System Recovery (Initramfs file missing/Corrupted)

• Lab on Basic System Recovery (Grub related issues

• Lab on Basic System Recovery (Master Boot Record missing/corrupted)

• Lab on Basic System Recovery (Critical files are missing like mount binary, incorrect entry in fstab etc)

GRand Unified BootLoader (Grub2)

• Overview of Grub

• Grub Configuration file

• Features of Grub2 and its comparison with Legacy Grub

• Practical Lab Session - Different commands to run at Grub2 prompt

• Practical Lab Session - Boot from Grub (Selecting Kernel & Initramfs)

• Practical Lab Session - How to make your grub password protected

Kdump configuration on RHEL 7

• Overview of kdump

• How to enable Kdump on RHEL 7

• Lab Session

Red Hat Satellite 6.2

• Overview of Satellite Server

• Pre-Requisites (What needs to be done before initiating the Red Hat Satellite Server installation)

• Registering the server using subscription manager

• Installing the Satellite Server Packages & updating the Server

• Installing satellite from the Offline Repositories.

• Initial Configuration for the satellite server

• Registering Satellite 

• Downloading/Uploading manifest (Importing manifest to Installed Satellite server)

• Attaching a subscription

• Create Red Hat Repo's as per the enviornment requirement

• Creating Activation

• Registering server (Red Hat Satellite client)

• Recap

Managing SELinux Security

• Introduction - SELinux

• SELinux Security Concepts

• Changing SELinux Modes

• Practice Lab Sessions

• Changing SELinux Contexts

• SELinux Booleans

• Audit logs & troubleshooting SELinux

Backup and Restore

• Overview of Backup

• Various commands for backup

• Types of backup

• Full backup, Incremental backup and differential backup

• dump command to take backup & restoration

Advanced Linux Commands

• dig, nslookup, rsync, scp, ssh, sftp, find, grep, locate, df, du, lsof, ps, top, who,cut, sort, vi, sed, awk, tar, gzip, bzip2 etc

• useradd, userdel, usermod, groupadd, groupdel, id, chage, chroot, chown etc

• mount, umount, fdisk, mkfs, fsck,/proc, uptime etc

• ping, nslookup, telnet, ifconfig, ifconfig-a, netstat -a etc

• systemctl -at service, systemctl -t service --state=active, systemctl start name.service, systemctl enable name.service  etc

• pvs, vgs, pvdisplay,lvs, lvdisplay, pvcreate, pvremove, vgcreate, vgrename, vgremove, vgextend, vgreduce, lvcreate, lvextend, lvreduce,fdisk, vgexport, vgimport, vgcfgrestore, vgcfgbakcup, watch, whoami, passwd, su etc

• last lecture