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IT & SoftwareOperating Systems & ServersLinux

Complete Linux Security & Hardening with Practical Examples

The Best Linux Security Course that prepare you to protects your Systems from attacks by hackers. Helps in RHCSA & RHCE
Rating: 4.5 out of 54.5 (666 ratings)
32,456 students
Created by Imran Afzal
Last updated 11/2021
English
English [Auto]

What you'll learn

  • By the end of this course you will be able to apply most of the security measures in your Linux environment
  • You will be able to pass the Redhat Certified Engineer exam (EX300)
  • You will reduce the risk of your Linux system being hacked or attacked
  • You will have expert knowledge of Linux account and system securities

Requirements

  • Basic understanding of Linux. My suggestion is to take my "Complete Linux Training Course to Get Your Dream IT Job"
  • You will need a Linux machine but if you have a Windows computer then you can install VirtualBox and install Linux (The instruction are covered in this course)

Description

If you have basic understanding of Linux and want to enhance your skill in Linux security and system hardening then this course is perfect fit for you.  Many security policies and standards require system administrators to address specific user authentication concerns, application of updates, system auditing and logging, file system integrity, and more. This course provides strategies for addressing specific policy and configuration concerns.

This course is intended to develop the skills needed to ensure data integrity on computer systems for organizations with high security standards. 


I have 35,000+ students on Udemy platform and many of them are able to secure their dream job in IT field just by taking my courses.  I always start with basic and then dive into advance level


This course is best for someone who:

  • wants to learn almost everything about Linux security

  • wants to step-up in his/her career

  • is looking for a job in Linux

  • needs technical guidance on how to enhance the security of Linux systems

  • is responsible for implementing security policy requirements on Linux systems consistently and in a reproducible way

  • must be able to demonstrate that Linux systems meet security policy requirements

  • maintains continued adherence to security requirements, including management of security-critical operating system/software updates


===================================================================================

Overview of the course:

There are total of 10 sections in this course


Section 1 – Introduction and Course Overview

  • Course Overview

  • Download Syllabus

Section 2 – Security Concepts

  • What is Security and OS Hardening?

  • Comparing House Security with Computer Security

  • Securing All Operating Systems

  • Importance of Linux Security

  • Security Implementation Tools

  • Type of Security Breach

  • Quiz, Handouts and Homework

Section 3 - Lab Setup (optional)

  • What is VirtualBox?

  • Installing Oracle VirtualBox

  • Creating First Virtual Machine

  • Linux Installation

Section 4 - Securing User Environment

  • Understanding /etc/passwd, /etc/group and /etc/shadow

  • The /etc/login.def File

  • Create User Account and Change Password

  • Change Password Parameters

  • Set Password Policy

  • Lock or Disable User Accounts Automatically

  • Lock or Disable User Accounts Manually

  • Lock User Account After 3 Failed Attempts

  • Restrict root Login

  • Disable SSH Access for a Specific User

  • Implement UID/GID Policy

  • Centralized Authentication Service

  • sudo Access

  • Monitor User Activity

Section 5 - PAM (Pluggable Authentication Module)

  • What is PAM?

  • The Importance of PAM

  • The PAM Configuration Files Format

  • PAM Config File – Module Interfaces

  • Account Access Through PAM

  • PAM Config File – Control Flags

  • PAM Config File – Modules (SO)

  • PAM Aware Services and Stacks

Section 6 - Securing Linux Filesystem

  • Linux File Types

  • Linux File Attributes

  • Linux File Ownership and Permissions

  • Changing File Permission

  • Changing File Ownership

  • Access Control List (ACL)

Section 7 - Securing Linux System

  • Message of the Day and customizing message of the day

  • Physical Server Security

  • Remove Unnecessary or Orphan Packages

  • Keep Kernel and System Up to Date

  • Stop and Disable Unwanted Services

  • Separate Disk Partitions

  • Disable Ctrl+Alt+Delete

  • Running One Service per System

  • Change Default Console Passwords

  • Disable USB Stick Detection

  • Enable Network Time Protocol (NTP or Chronyd)

  • Lockdown Cronjobs

  • Change SSH Ports

  • SELinux (longest lecture and lab)

  • Backups

Section 8 - Securing Linux System Network

  • Introduction to Firewall

  • iptables (tables, chains and targets)

  • iptables (practical examples)

  • Firewall (firewalld)

  • firewalld (Practical Examples)

  • firewalld (GUI)

  • Encrypt Incoming and Outgoing Traffic

  • SSH vs. Telnet

  • Turn Off IPV6 (If not in use)

Section 9 - Securing Environment Around Linux

  • Hardware/Network Firewall

  • Network Address Translation (NAT)

  • VPN Tunnel

  • Application and Database Encryption

Section 10 - Additional Resources

  • Many more lectures on Linux...


===================================================================================


Here is the testimonial from my students:

  • To all of you that are looking for a REALLY GOOD LINUX course, THIS IS IT, SERIOUSLY I promise you won't find a course on LINUX here that is THIS GOOD. -- T.J. Marstiller (Udemy Student)


  • Imran is a very knowledgeable and engaging instructor. As others have said, you can tell that he is not just trying to sell a course, but that he is invested in giving his students a strong career foundation with a positive and approachable attitude. He is also entertaining with his use of pop culture and practical work examples. It really feels like you're in a classroom with him. I'm taking this course mainly as a hobbyist, but got a lot from it already. The homework assignments, quizzes, and handouts help reinforce the material.   -- Raymond B.  (Udemy Student)


  • Main thing about course is its simplicity and the hierarchy. Design is very good and easy which helps to understand things better.  -- Akash Garg (Udemy Student)


  • I just love the teaching ad the learning experience I am getting  -- Jacob Samba (Udemy Student)


  • Imran Afzal might be my favorite teacher I've EVER had. He is funny, and engaging. The course was easy to follow, and with no experience starting I am now extremely comfortable with Linux, and actually really like it. He does make you do your googles, but this is not a bad thing especially considering the nature of IT and documentation to solve your own problems. I highly recommend.  -- Vanessa Diaz-Goumond (Udemy Student)


  • The course is run very well and I really like the handouts and the homework that is assigned. The homework helps me learn and continue with the learning process even when adult life is still progressing forward.  -- Thomas Rogers (Udemy Student)


  • Such an amazing instructor. Imran must have put in a lot of effort in structuring the course and taking the student step by step, he takes his time in explaining everything, from what Linux is, how to down load it, coding, etc. I have taken other courses from Imran. I am a student for life. Keep it up and please keep preparing more courses for please like us who can benefit from your way of teaching, knowledge and experience. Thank you.  -- Ali Shiekh (Udemy Student)


  • In the first place I say a big thank you to the instructor for making such a great course. I was afraid to learn Linux. I now feel very comfortable with Linux. I have understood both the concept behind and the practical as well. I would recommend every one who is NEW to Linux and wants to grab it once and for all without wasting time to go ahead and ENROLL. You will not regret it. I would like the instructor to do same for WINDOWS SERVER ADMIN., I don't seem to find any better and beginner oriented course out there that could be matched with this course. To me, it is the BEST Linux Course on Online. I just started some real world projects with Linux after this great course, I was new to Linux and in just a month I am on the command line always playing.  -- Opoku Bright (Udemy Student)


  • I genuinely look forward to additional courses in the future. This has been so informative. You hear the name oracle all the time, but this was well put in layman’s terms  -- Atoofa Hasan (Classroom Student)


  • Imran Afzal eats, breathes and sleeps Linux! He really knows his stuff. I feel like he has brought me from a novice level education to masters level in a short time period. Anyone who is looking to get a job in Linux should definitely take this course.  -- TJ Walker (Udemy Student)

Who this course is for:

  • Anyone who wants to have complete understanding Linux security and OS hardening
  • Anyone who wants to advance his/her career
  • Anyone who wants to pass the RHCE EX300 exam

Featured review

Earnest Redwood
Earnest R.
35 courses
16 reviews
Rating: 5.0 out of 5a year ago
Yes this cores is a great match for what I would like to learn more about Computer and network security, Learning how, to lock down a computer. The instructor to me, is doing a great job of explaining the basics concept in such away that I can replete back to him. I am really happy right now.

Instructor

Imran Afzal
Best Selling Instructor with over 350k+ students worldwide
Imran Afzal
  • 4.6 Instructor Rating
  • 35,424 Reviews
  • 360,631 Students
  • 19 Courses

Imran Afzal has over 20 years of experience in Systems administration/engineering, leadership, entrepreneurship, training, and public speaking.


Currently Imran manages a large team of systems engineers, administrators and team leads globally. He started his career with Time Warner (New York City) in 2000 as a systems administrator. That is where he began his IT career.


He has utilized IT skills in many fortune 500 companies such as financial firm, fashion industry, tech media industry etc. He spearheaded projects like datacenter migration, introduction and deployment of VMWare, monitoring tools implementation, Amazon cloud migration and many more.


Imran earned his bachelor’s in Computer Information Systems from Baruch College, City University of New York as an honor student. He earned his Master of Business Administration (MBA) from New York Institute of Technology (NYIT).


Some of his certifications are in Linux Systems Management, UNIX Operating Systems, Linux System Administration, System Internals, VMWare Certified Professional, RHCSA and Windows Server Certified


Imran has been training since 2010 and provides onsite and online training on many IT subjects. He has some of the bestselling and highest rated online courses with over 300,000 students worldwide. He has helped almost 1000+ students to land a job of their dream in IT.


He believes in education and giving back. He also established a non-profit school for children from pre-K till 10th grade.



Here is what students have to say:

Hi Imran, I have completed this course twice. It was more than just wonderful. It proved to be life changer for me, I had zero knowledge about Linux and now i am working as Linux SysAdmin as i have acquired my dream job.

Thank you so much for the wonderful course.  I am looking forward to see some more exciting courses from you.

Regards, -- Hasan Raza


To all of you that are looking for a REALLY GOOD LINUX course, THIS IS IT, SERIOUSLY I promise you won't find a course on LINUX here that is THIS GOOD. -- T.J. Marstiller


Hi Imran, I am so glad to inform you that i got two offers as a Linux engineer.  Through your course I gained lot of confidence and your interview tips really helped me a lot to crack the technical rounds.  I have recommended your courses to my friends as well.  Thank you so much for your efforts in sharing your knowledge to learners like us.  -- Subhasree


Hi Sir Imran,

Greetings to you. I am writing this email to give good feedback regarding your course materials that I have watched from Udemy.  I have completed your Linux course and I would like to mention that it has been nothing but awesome.  Your course has allowed me to obtain a Linux certification and I would like to give a big thanks you for that.  Please continue what you're doing and I wish you the very best.  -- Yusuf Ishkandersha


Imran is a very knowledgeable and engaging instructor. As others have said, you can tell that he is not just trying to sell a course, but that he is invested in giving his students a strong career foundation with a positive and approachable attitude. He is also entertaining with his use of pop culture and practical work examples. It really feels like you're in a classroom with him. I'm taking this course mainly as a hobbyist, but got a lot from it already. The homework assignments, quizzes, and handouts help reinforce the material.   -- Raymond B.


- Main thing about course is its simplicity and the hierarchy. Design is very good and easy which helps to understand things better.  -- Akash Garg (Udemy Student)


- I just love the teaching ad the learning experience I am getting  -- Jacob Samba (Udemy Student)


- Imran Afzal might be my favorite teacher I've EVER had. He is funny, and engaging. The course was easy to follow, and with no experience starting I am now extremely comfortable with Linux, and actually really like it. He does make you do your googles, but this is not a bad thing especially considering the nature of IT and documentation to solve your own problems. I highly recommend.  -- Vanessa Diaz-Goumond (Udemy Student)


- The course is run very well and I really like the handouts and the homework that is assigned. The homework helps me learn and continue with the learning process even when adult life is still progressing forward.  -- Thomas Rogers (Udemy Student)


- Such an amazing instructor. Imran must have put in a lot of effort in structuring the course and taking the student step by step, he takes his time in explaining everything, from what Linux is, how to down load it, coding, etc. I have taken other courses from Imran. I am a student for life. Keep it up and please keep preparing more courses for please like us who can benefit from your way of teaching, knowledge and experience. Thank you.  -- Ali Shiekh (Udemy Student)


- In the first place I say a big thank you to the instructor for making such a great course. I was afraid to learn Linux. I now feel very comfortable with Linux. I have understood both the concept behind and the practical as well. I would recommend every one who is NEW to Linux and wants to grab it once and for all without wasting time to go ahead and ERNOLL. You will not regret it. I would like the instructor to do same for WINDOWS SERVER ADMIN., I don't seem to find any better and beginner oriented course out there that could be matched with this course. To me, it is the BEST Linux Course on Online. I just started some real world projects with Linux after this great course, I was new to Linux and in just a month I am on the command line always playing.  -- Opoku Bright (Udemy Student)


- I genuinely look forward to additional courses in the future. This has been so informative. You hear the name oracle all the time, but this was well put in layman’s terms  -- Atoofa Hasan (Classroom Student)


- Imran Afzal eats, breathes and sleeps Linux! He really knows his stuff. I feel like he has brought me from a novice level education to masters level in a short time period. Anyone who is looking to get a job in Linux should definitely take this course.  -- TJ Walker (Mentor)


- I find it very easy to understand & learn Linux. Even if you are beginner in Linux you will understand the material. Imran has done a great job explaining every topic in detail in each course. This course has provided me with a great deal of knowledge about Linux. This course is worth every penny of yours.  -- Mohammad Jalani (Classroom Student)

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