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

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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