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How to install KVM on CentOS 7 / RHEL 7 Headless Server
To install KVM on a headless CentOS 7 / RHEL 7 server, follow these steps: n n Verify Hardware: Check if your hardware supports virtualization. Run the following command to check: n n n n egrep -c '(vmx|svm)' /proc/cpuinfo n n n If the output is greater than 0, your hardware supports virtualization.
How to add network bridge with nmcli (NetworkManager) on Linux
To add a network bridge using the nmcli command-line tool with the NetworkManager service in Linux, follow these steps:rn rn Install the NetworkManager command line tool: rn rn rn rn sudo yum install NetworkManager-clirn rn rnorrn rn rn sudo apt- get install NetworkManager-clirn rn rn rn Create a br
How to redirect standard (stderr) error in bash
You can redirect standard error (stderr) in bash to a file, or to another standard stream, such as standard output (stdout), using the following syntax:rn rn rn command 2> file.txtrn rn rnThis will redirect the standard error stream from the "command" to the file "file.txt". To redirect standa
How to disable bash shell history in Linux
To disable bash shell history in Linux, you can use the following steps:rn rn Open the bash shell profile file: rn rn rn rn $ nano ~/.bash_profile rn rn rn rn Add the following line to the end of the file: rn rn rn rn unset HISTFILErn rn rn rn Save and close the file. rn Log out and log back in, or
How to access/view Python help when using vim
rn To access Python help in Vim, you can use the following steps: rn rn rn rn rn rn rn Start Vim and open a Python file or just enter normal mode by pressing the "Esc" key. rn Type :help pydoc to access the built-in help for Python in Vim. rn To view the help for a specific module or function, enter
How to build Perl module rpm file with cpanspec on RHEL/CentOS Linux
To build a Perl module RPM file using cpanspec on RHEL/CentOS Linux, you can follow the steps below:rn rn Install cpanspec : rn rn rn rn # yum install cpanspec rn rn rn rn Download the Perl module from CPAN: rn rn rn rn # cpan <Module-Name> rn rn rn rn Convert the Perl module to an RPM package
How to reload .vimrc file without restarting vim on Linux/Unix
To reload the .vimrc file without restarting Vim on Linux/Unix, you can use the :source command. The syntax is as follows:rn rn bash Copy code rn : source ~/.vimrcrn rn rnThis command will read the .vimrc file again and apply any changes you have made. The ~/ specifies the home directory of the curr
How to install Skype application on Linux
There are several ways to install Skype on Linux, including the following:rn rn Install using Snap: You can install Skype on Linux using the Snap package manager. To do this, follow these steps: rn rn rn rn sudo snap install skype --classic rn rn rn rn Install using Flathub: Flathub is another packa
How to install wget on RHEL 8 using the yum/dnf command
To install wget on RHEL 8 using yum / dnf command, follow these steps:rn rn Open a terminal or SSH into your RHEL 8 system rn Update the package lists: rn rn rn rn dnf update rn rn rn rn Install wget using dnf command: rn rn rn rn dnf install wgetrn rn rnThis will install wget on your RHEL 8 system
Suse Linux Change Hostname (computer name) without yast
To change the hostname on a SUSE Linux system without using yast , you can use the following terminal commands:rn rn Open a terminal or SSH into your SUSE Linux system rn Backup the current /etc/HOSTNAME file: rn rn rn rn cp /etc/HOSTNAME /etc/HOSTNAME.bakrn rn rn rn Open the /etc/HOSTNAME file in a
How to print filename with awk on Linux / Unix
You can print the filename using the FILENAME variable in awk. Here's an example:rn rn rn awk '{ print FILENAME ": " $0 }' file1 file2rn rn rnThis command will print the content of file1 and file2 , each line prefixed by the filename. You can also use the ARGV array to iterate over all the files
How To Install Nginx on SUSE Linux Enterprise server 12
To install Nginx on SUSE Linux Enterprise server 12, follow these steps:rn rn Add the Nginx repository to the system:rn rn rn sudo zypper addrepo http://nginx.org/packages/sles/12/x86_64/ nginxrn rn rn Refresh the package list:rn rn rn sudo zypper refreshrn rn rn Install Nginx:rn rn rn sudo zypper i
How to setup and configure network bridge on Debian Linux
To set up and configure a network bridge on Debian Linux, follow these steps:rn rn Install the required packages:rn rn rn sudo apt - get update rnsudo apt - get install bridge - utils - yrn rn rn Create a backup of your network interfaces configuration file:rn rn rn sudo cp /etc/network/interfaces /
How to install KVM server on Debian 9/10 Headless Server
To install KVM server on a Debian 9/10 headless server, follow these steps:rn rn Install the required packages:rn rn rn sudo apt - get update rnsudo apt - get install qemu - kvm libvirt - daemon - system libvirt - clients bridge - utils virtinst - yrn rn rn Add your user account to the libvirtd grou
How to install VLC 3 application (Vetinari) on Linux
To install VLC 3 (Vetinari) on a Linux system, follow these steps:rn rn Add the VLC repository to your system's package manager:rn rn For Debian/Ubuntu:rn rn rn sudo add-apt-repository ppa:videolan/master-dailyrn rn rn For Fedora:rn rn rn sudo dnf config-manager -- add -repo https: //download.videol
How to reset forgotten root password for Linux KVM qcow2 image/vm
Here's how to reset the root password for a Linux KVM virtual machine in a qcow2 image:rn rn Stop the virtual machine: To reset the root password, you need to stop the virtual machine first. You can stop it using the following command: rn rn rn rn virsh shutdow rn rn rn rn Convert the qcow2 image to
How to create AWS ec2 key using Ansible
Here's how to create an EC2 key using Ansible:rn rn Install the AWS CLI: To use Ansible with AWS, you need to have the AWS CLI installed. You can install it using the following command: rn rn rn pip install awsclirn rn rn rn Configure the AWS CLI: You need to configure the AWS CLI with your AWS cred
How to patch Meltdown vulnerability on OpenBSD Unix
The Meltdown vulnerability is a hardware-level security issue that affects many modern processors. To patch the Meltdown vulnerability on OpenBSD Unix, you can follow these steps:rn rn Upgrade to the Latest Version of OpenBSD: OpenBSD releases regular security patches to address vulnerabilities, inc
Secure memcached server to avoid DDoS amplification attacks
Memcached is a distributed memory caching system that is commonly used to speed up dynamic websites. However, it has also been used as a tool in DDoS amplification attacks. To secure a Memcached server and prevent DDoS amplification attacks, you can follow these steps:rn rn Limit Access to the Memca
How to change theme in Ubuntu 16.04/17.10
To change the theme in Ubuntu 16.04 or 17.10, you can follow these steps:rn rn Open the Unity Dash and search for "Appearance ". rn Open the Appearance Settings. rn In the Appearance Settings window, click on the " Themes " tab. rn You will see a list of available themes. To select a different theme
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