nixCraft Linux & Unix Sysadmin/DevOps Tutorial Newsletter

[nixCraft]

Welcome to nixCraft Linux/Unix newsletter for Tuesday, 12 May 2020. I hope you will enjoy this version of the newsletter.

• How to install KVM on CentOS 8 Headless Server {trending}
  How can I install KVM (Kernel-based Virtual Machine) on a CentOS 8 (CentOS Enterprise Linux) headeless server? How do I set up KVM on a CentOS 8 and use cloud images/cloud-init for installing guest VM?
   
• CentOS 8 add network bridge (br0) with nmcli command
  
  

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  How do I configure my CentOS 8 and add network bridge (br0) with the nmcli command? How can I create a Linux network bridge on CentOS Linux 8 server for KVM (Kernel-based Virtual Machine)?
   
• How to install Adminer on Ubuntu 20.04 LTS {trending}
  How do I install Adminer on Ubuntu 20.04 LTS for database management over the web? 
   
• Nginx restore real IP address when behind a reverse proxy
  My Nginx web server is behind a reverse proxy server. How do I restore the original and real IP address of my client/visitors when behind a reverse proxy server such as AWS Cloudfront, Fastly, Cloudflare CDN/WAF?
   
• How To Secure Apache with mod_md Let’s Encrypt on Ubuntu 20.04 LTS {trending}
  How do I secure Apache with mod_md Let’s Encrypt on Ubuntu 20.04 and obtain a free TLS/SSL certificate? How do I secure Apache 2 with Let’s Encrypt on Ubuntu 20.04 LTS server?
   
• How to install man pages on Ubuntu Linux
  I installed the minimal Ubuntu Linux 20.04 LTS cloud server, and now man pages are missing from my image. How do I install man pages on Ubuntu Linux 16.04/18.04/20.04 LTS server?
   
• How to install Apache on Ubuntu 20.04 LTS {trending}
  How do I install the Apache on Ubuntu 20.04 LTS Linux server?
   
• How to forcefully renew Let’s Encrypt certificate
  
  
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  How do I forcefully renew the Letsencrypt certificate on an Ubuntu, Debian, CentOS, RHEL, Fedora, or FreeBSD Unix systems?
   
• How to add and delete users on Alpine Linux
  How do I add and delete users on Alpine Linux?
   
• Linux how long a process has been running? {trending}
  
  
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  Explains commands to identify process IDs (PID) in Linux systems and then determine how long they have been running on your machine or cloud server using the CLI.
   
• How to install bash shell in Alpine Linux
  How to install bash shell in Alpine Linux or Docker image powered by Alpine Linux.
   
• Top 32 Nmap Command Examples For Linux Sys/Network Admins {trending}
  Nmap is short for Network Mapper. It is an open-source security tool for network exploration, security scanning, and auditing. However, the Nmap command comes with lots of options that can make the utility more robust and difficult to follow for new users. The purpose of this guide is to introduce a user to the Nmap command line tool to scan a host or network to find out the possible vulnerable points in the hosts. You will also learn how to use Nmap for offensive and defensive purposes.
   
• Bash Check If Shell Is Interactive or Not Under Linux / Unix Oses
  How do I check in GNU/Bash if a shell is running in interactive mode or not while writing shell scripts?
   
• Bash add pause prompt in a shell script ( bash pause command )
  Most of you may be aware of old good DOS/2000/XP pause command. It is used to display the prompt while suspending the processing of a batch script. It is used within a computer batch file and allows the computer to pause the currently running batch file until the user presses any key. Let us see how to pause our bash based shell script for a given number of times in seconds/minutes/hours before continuing to next operation/command running on a Linux or Unix-like systems.
   
• Regular expressions in grep ( regex ) with examples {trending}
   How do I use the grep command with regular expressions on a Linux and Unix-like operating systems? How do I use grep and regular expressions (regex)to search for text/ words in Linux?
   
• How to delete group in Linux using groupdel command
  I am a new Linux system user and sysadmin too. How can I delete a group in Linux operating system using the command line option? How do I remove a group from Linux? Can you tell us command to delete group in Linux?
   
• Linux mount an LVM volume / partition command
  I have some data on second SATA hard disk created by Fedora Linux installer with some data. How do I mount an LVM volume/partition in Linux to access my data? Can you tell me the command to mount LVM partition in Linux and access my data from another disk?
   
• How To Enable and Install EPEL Repo on CentOS 8 {trending}
  How do I install the Extra Packages for Enterprise Linux (EPEL), such as Fedora EPEL repo on a CentOS Enterprise Linux server version 8.x? How to enable EPEL repo on CentOS 8?
   
• How to check whether AMT is enabled and provisioned under Linux
  How do I check whether Intel Active Management Technology (AMT) and Intel Standard Manageability (ISM) enabled or disabled under Linux using command line?
   
• How to delete KVM VM guest using virsh command
  I am a new Linux and KVM user. How do I delete a VM guest with virsh command line on Linux operating system? How do I delete a virtual machine called vps42 on Ubuntu or CentOS Linux server?
   
• Linux List All Users In The System
  This page describes various Linux commands to list all users on the Linux operating system, including Ubuntu, Debian, RHEL, Arch, Fedora, CentOS, and other distros.