• views: 26
• date: 26 August 2026
• posted by: voska89

From SSH Basics to PAM, Kernel Options, File Integrity and Logging — on Debian and Ubuntu, With Lynis

What you'll learn

⚡ Harden Debian and Ubuntu servers systematically — from SSH access to the kernel options
⚡ Secure SSH: key login instead of a password, port, keep-alive and the options that matter
⚡ Set up a packet filter with ufw and understand the rules it writes into the kernel
⚡ Configure automatic security updates with unattended-upgrades and have the report mailed out
⚡ Install the Lynis security tool, run audits and use the hardening index as a measurement
⚡ Sort Lynis findings: separate warnings from suggestions and rank them by effort and effect
⚡ Harden authentication: password policy, PAM modules and accounts nobody needs any more
⚡ Set kernel options through sysctl: network packets, memory protection and what Lynis checks
⚡ Establish logging and traceability: auditd, process accounting and sysstat
⚡ Check file integrity with AIDE, switch off services and protect the boot loader with a password

Requirements

❗ NO prior knowledge of security required.
❗ Basic Linux administration skills are helpful (terminal, package management).
❗ A Debian or Ubuntu test machine to follow the steps yourself.

Description

*This course contains the use of artificial intelligence.
Welcome to "Linux Security Hardening & Auditing: Practical Course"!
Do you want toaudit your Linux servers andharden them systematically? Then this course is exactly right for you!
We start with the basics:SSH access gets a key instead of a password, apacket filter goes in front of it andsecurity updates are installed automatically. From there we move on to the topics that usually get left behind —PAM, kernel options, file integrity and logging.
Throughout, we work withLynis, the security tool that audits Linux systems test by test and sorts its findings intowarnings and suggestions. You learn torank those findings, work through them and read thehardening index as a measurement before and after.
All of this is demonstrated inlive demos on real systems – not in lengthy presentations. Every step runs on screen, with the commands, the output and thereasoning behind it.
Our agenda covers topics such as
✨ Harden Debian and Ubuntu servers systematically — from SSH access to the kernel options
✨ Secure SSH: key login instead of a password, port, keep-alive and the options that matter
✨ Set up a packet filter with ufw and understand the rules it writes into the kernel
✨ Configure automatic security updates with unattended-upgrades and have the report mailed out
✨ Install the Lynis security tool, run audits and use the hardening index as a measurement
✨ Sort Lynis findings: separate warnings from suggestions and rank them by effort and effect
✨ Harden authentication: password policy, PAM modules and accounts
✨ Set kernel options through sysctl: network packets, memory protection and what Lynis checks
✨ Establish logging and traceability: auditd, process accounting and sysstat
✨ Check file integrity with AIDE, switch off services and protect the boot loader with a password
This course gives youdirectly applicable knowledge that makes your serversmeasurably safer.
So take this opportunity and enrol now,to bring your Linux systems to a solid security level!

Who this course is for

⭐ Systems administrators and DevOps engineers who want to secure their Linux servers systematically.
⭐ Systems administrators and DevOps engineers who want to run audits and work through the findings.

Homepage

https://www.udemy.com/course/linux-security-hardening-auditing-practical-course

   
   
   

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