- Linux
- Linux Basics
- Operating System Basics
- Processes explained
- Difference Between Process and Thread
- The Basics of Hypervisors
- What’s a Kernel?
- Processes and VM Videos
- What is Linux?
- What is a Linux Package?
- Stages of Linux booting process – explanation, step by step
- Whats an Inode
- Explanation-System calls and System call types in operating system
- Linux Package Management
- How the ls -l command works
- Linux Isolation Basics
- Understanding Linux File Permissions
- Understanding UMASK value in Linux
- What is Umask and How To Setup Default umask Under Linux?
- File descriptor
- Understanding Special Permission SGID in Linux
- Searching with grep
- Introduction to Linux and Basic commands
- fstab explained
- Introduction to mounting filesystems in Linux
- SSH
- Ram & Disks
- Video tutorial on extending swap partition and creating a swapfile
- Commands
- SystemD
- What is a Unix Socket?
- How to check disk space on Unix servers
- 3 commands to reboot Linux (plus 4 more ways to do it safely)
- See Detailed History Of yum history Commands
- How to Transfer Files with Rsync over SSH
- How to Use the mkfs Command on Linux
- Linux +
- Boot process
- An in depth look at the Linux Boot process
- Systemd Boot Process, a closer look
- Stages of Linux booting process – explanation, step by step
- 6 Stages of Linux Boot Process (Startup Sequence) sysVinit:
- The difference between booting MBR and GPT with GRUB
- The Master Boot Record (MBR) and Why it is Necessary?
- GRUB bootloader – Full tutorial
- Step by Step Linux boot process with GRUB2 and systemd in RHEL 7 / CentOS 7
- Init and Initramfs
- CPU
- CPU & LOAD AVERAGE
- A Guide to the Linux “Top” Command
- Understanding CPU Steal Time – when should you be worried?
- CPU Steal Time. Now on Amazon EC2
- USER SPACE VS KERNEL SPACE
- What is the Difference Between Hardware and Software Interrupt
- What exactly is “iowait”?
- Difference Between Process And Thread in Linux
- Operating Systems | States of a process
- Virtualization
- Commands
- Memory Management
- Processes
- Disk
- Linux Storage Stack Diagram
- Linux Basics – LVM (Logical Volume Manager)
- Why is space not being freed from disk after deleting a file in Red Hat Enterprise Linux?
- Understanding I/O: Random vs Sequential
- Amazon EBS
- Linux iostat command
- How to Read Linux Iostat’s Output and Interpret System Performance
- Video tutorial on extending swap partition and creating a swapfile
- Linux Basics – LVM (Logical Volume Manager)
- RAID
- Video tutorial on extending swap partition and creating a swapfile
- Virtual filesystems in Linux: Why we need them and how they work
- Overview of Forks, Threads, and Asynchronous I/O
- How to Change Kernel Runtime Parameters in a Persistent and Non-Persistent Way
- How internet security works: TLS, SSL, and CA
- Basics-of-bash-for-beginners
- Boot process
- RHEL(RedHat)
- Amazon Linux 2
- Centos 8
- Ubuntu
- SUSE
- Tools
- Linux Basics
- Networking
- Networking basics
- Introduction to Networking
- TCP/IP explained
- TCP connection states
- TCP three way handshake
- TCP/IP Ports and Sockets Explained
- DNS Name Resolution Process
- What happens when we hit a URL in our browser
- What is SSL
- SSL or TLS handshake
- What is an SSL Certificate and How Does it Work?
- DHCP Explained
- The Certificate Authority vs. The Handshake
- Networking +
- Networking basics
- Application Services and Packages
- Apache
- What is Apache?
- Apache Basics Video
- Apache Cheat Sheet
- Apache Performance Tuning: MPM Modules
- How To Use Apache as a Reverse Proxy with mod_proxy on CentOS 7
- Tune memory allocation for an Apache web server
- Failed to restart httpsd.service: The name org.freedesktop.PolicyKit1 was not provided by any .service files
- Redirecting from one URL to another using .htaccess
- USING .HTACCESS REWRITE RULES
- URL Rewriting for Beginners
- How to Enable Apache Userdir Module on RHEL/CentOS
- How to set up password authentication in apache (httpd) with htpasswd and .htaccess on RHEL / CentOS 7
- How to redirect HTTP to HTTPS Using .htaccess
- How to Enable TLS 1.3 in Apache and Nginx
- Apache Benchmark
- Nginx
- How To Install Linux, Nginx, MySQL, PHP (LEMP stack) on Ubuntu 18.04
- How to install and use Nginx on CentOS 8
- Nginx Bible
- Basic Nginx commands
- Basic configuration parameters
- SSL certificate Installation
- Full configuration Example
- Nginx Rewrite examples
- Nginx redirect from www to none www domain name
- How to Set Up an Nginx Certbot
- Urgent security issue in NGINX/php-fpm
- Moving from Apache2 to Nginx Webserver
- PHP
- MYSQL
- Fail2ban
- Magento2
- VNC Installation on Ubuntu
- How to install XRDP in Amazon Linux 2
- Apache
- My issues
- WordPress
- WordPress FTP error
- Unable to upload file to WordPress
- WordPress Posts Returning 404 Error
- How to Fix the 500 Internal Server Error on Your WordPress Website
- How to Fix Corrupted Files and Databases in WordPress
- Max_upload exceeded..!!! WordPress
- 6 Ways To Increase the Maximum Upload File Size in WordPress
- Being prompted for password after not setting one (RHEL/Amazon Linux)
- Unable to transfer files from one instance to another using SCP
- Website running and reachable via a browser however giving a 403 when running a CURL
- Issue installing Cerbot on Amazon Linux 2
- How to restore “Kernel panic – not syncing: VFS: Unable to mount root fs on unknown-block(0,0)”
- Renewing your SSL certificate using Certbot/Letsencrypt manually:
- WordPress
- AWS(Amazon Web Services)
- Amazon EBS
- AWS SSM
- ElastiCache
- AWS EFS
- AWS EC2
- Instance Health Checks failing
- EC2 failing “[WARNING]: Calling ‘http://169.254.169.254/2009-04-04/meta-data/instance-id’ failed”
- Troubleshooting a Linux kernel panic after patching
- Reproducing a “Kernel panic – not syncing: VFS: Unable to mount root fs on unknown-block(0,0)”
- How to fix a Kernel panic – not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
- How to fix a Kernel panic – not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
- Reasons why an instance with root on LVM might fail to boot
- Instance failing health checks with a Kernel Offset: disabled error
- EC2 SSH ISSUES
- How to use the same SSH key pair in all AWS regions
- Steps to install python3.7 on Amazon Linux 1
- Why did the CPU credit balance for my Amazon EC2 T2 instance suddenly drop?
- Why did the CPU credit balance for my Amazon EC2 T2 instance suddenly drop?
- Instance Health Checks failing
- Lightsail Loadbalancer failing health checks
- AWS Docs
- Service Introduction Videos
- Troubleshooting videos
- Troubleshooting
- Articles
- My Curriculum Vitae (CV)
