Red Hat Linux Administration & Advance level Troubleshooting
Udemy
Course Summary
Start on-demand career as a Linux Server Admin and learn from real IT professionals with live Environment Sessions.
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Course Description
- This module consists of basic administration of Linux to advance level of booting troubleshooting & Basic System Recovery on Red hat Linux Version 5/6/7
The training is imparted by senior professional engineers.Â
                           Red Hat LINUX Basic Course Outline
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Linux basic concepts,Introduction & History of Unix/Linux
- Introduction to Unix
- History of UNIXÂ Â
- What is LINUXÂ
- History of LinuxÂ
- LINUX Distributions Â
- Unix File System
Linux Commands Tutorials (101 Commands learning)
- 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
- 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
- chkconfig --list, chkconfig name --list, chkconfig name on/off, service name status, service name stop/start, runlevel, who -r, 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
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 groupsÂ
- Permission Types
- Change of permissions & ownershipÂ
- Special Permissions Â
- Setuid, Setguid, Sticky bit, ACL etc
- Two Labs to demonstrate the permissions from real IT industry environment.
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
- 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
Logical Volume Manager Administration
- LVM Architecture Overview
- LVM Components
 -Physical Volumes
 -Logical Volumes -Volume Groups
- LVM Logical Volumes
 -Linear Volumes
 -Striped Logical Volumes
 -Mirrored 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 GroupÂ
- Activating and Deactivating Volume GroupsÂ
- Removing Volume Groups
 RPM (Red Hat Package Manager)Â
- 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.
How to find HBA details & Storage Connectivity & Scan new disks/luns on Red Hat Linux Physical ServerÂ
- How's HBA/FC's are connected to the Linux Physical Server
- Lab on Live production Environment
- How storage disks are connected to the serverÂ
- What all the paths of a disk to access the SAN Storage via round robin request
- Lab on understanding the disks paths via different HBA/FC Card.
- How to scan new luns coming from storage on Red Hat Linux
Networking Concepts in RHEL 7
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.Linux Performance Monitoring
- Introduction about Performance monitoring in Linux
- Important four subsystems that needs to be monitored.
1. CPUÂ
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
- topÂ
- vmstatÂ
- iostat
- freeÂ
- lsofÂ
- tcpdump- Network Packet Analyzer
Troubleshooting Linux Boot Problems in Red Hat Linux 5/6/7 (Basic System Recovery) - Advanced Level
- Simple & step by step understanding of Linux Boot Process ( 2 detailed Sessions)
- Overview of Red Hat Linux 7 and their features
- 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)
- Red Hat Linux 7 - Sessions to understands different systemd targets & new commands.
- Red Hat Linux 7 - Sessions to understand different phases of booting modes like Rescue Mode/Emergency Mode & Troubleshooting Mode.
- Lab on Booting to Rescue Mode on RHEL7
- Lab on Booting to Emergency Mode/Debug shell on RHEL7
- Lab on Recovering the Root password in RHEL7
- Resetting the Root Password Using an Installation DiskÂ
- Resetting the Root Password Using rd.break
- Lab-10 on Repairing disk and file system errors on RHEL7