“Destination Host Unreachable” when doing a ping request?
Are you seeing 'From x.x.x.x icmp_seq=1 Destination Host Unreachable' when you ping an IP Address using ICMP? This could be due to various reasons, which I'll cover here. Let me…
What is the difference between mawk and gawk?
AWK, a versatile text-processing tool, comes in different versions, such as mawk, gawk, and nawk. Let's specifically explore the distinctions between mawk and gawk. mawk: mawk is an older version…
Extend ext4 partition(/) in a Virtual machine (VMware) using “growpart”?
In this post, we'll explore extending an ext4 partition, both with and without LVM, using "growpart".Initially, we'll focus on extending the LVM root partition (/), followed by extending a non-LVM…
No Boot Device Available issue in Dell Servers?
After replacing the 2 failed INTEL SSD drives with 2 new Samsung SSD drives and configuring RAID-1, I proceeded to install Ubuntu 20.04 on that Virtual Disk (VD). I saw…
How to use custom SSL certificates in vCenter?
In this guide, we will examine the installation and update procedures for custom SSL certificates in vCenter.1) /usr/lib/vmware-vmca/bin/certificate-manager2) select option "1" 3) Enter the username (default to "Administrator@vsphere.local") and password…
How to configure SSL Certificates for Apache2, Nginx and HaProxy servers?
To configure the SSL certificate, follow these steps:1) First, generate a private key and a CSR, a process common to all three servers (Apache2, Nginx, HAProxy). openssl req –new –newkey…
About the POSIX-compliant shell and is Bash shell POSIX-compliant?
POSIX, short for "Portable Operating System Interface," is a family of standards developed to ensure compatibility between various operating systems. This compatibility extends to user interfaces, allowing users to interact…
Shell Built-ins vs. Shell Keywords: Understanding the Differences
Let's explore the differences between a shell built-in and a shell keyword.Shell Built-in A built-in command is hardcoded into the shell, executing faster than external commands since there's no need…
Steps for upgrading Ubuntu Linux from 14.04 to 20.04 version?
To upgrade Ubuntu to the latest version, follow this sequential upgrade path: 14.04 ➔ 16.04 16.04 ➔ 18.04 18.04 ➔ 20.04NOTE: Based on my experience with OS upgrades, it's advisable…
Parted Magic (Pmagic) magical way to backup and restore data in a hard drive?
Parted Magic is a software that allows one to take a complete backup of a hard drive and restore the backup to the hard drive when needed. It can also…