Rahul Sahu

Setting up an OpenVPN server on Ubuntu 20.04 LTS can be done in a few simple steps. Here is an overview of the process: Install OpenVPN by running the command: sudo apt install openvpn Create a directory to store the server configuration files by running the command: sudo mkdir /etc/openvpn/server Generate the necessary certificate and … Read more

VnStat is a console-based network traffic monitor that can be used to track network traffic on Linux systems. To install VnStat on Ubuntu 20.04 LTS, you can use the following steps: Update the package list by running the command: sudo apt update Install VnStat by running the command: sudo apt install vnstat Once the installation … Read more

To create a new user with sudo permissions on Ubuntu 20.04 LTS, you can use the following steps: Open the terminal and run the command: sudo adduser <username> this command will create a new user with the given username, it will prompt you to set a password and some personal information for the new user. … Read more

To list all failed units/services on a Linux system using systemd, you can use the systemctl command with the –failed option. The following command will list all units/services that have failed to start or have been in a failed state: systemctl –failed This command will display a list of all units that have failed to … Read more

To install KVM on a headless CentOS 8 server, you will need to perform the following steps: Ensure that your server’s CPU supports virtualization by running the following command: grep -E ‘vmx|svm’ /proc/cpuinfo This command should return output if virtualization is supported. Install the KVM and QEMU packages by running the following command: sudo dnf … Read more

To add a network bridge (br0) on a CentOS 8 system using the nmcli command, you can use the following steps: Check the available network interfaces by running the command: nmcli device Create a new bridge interface by running the command: nmcli connection add type bridge con-name br0 ifname br0 Add an IP address to … Read more

Adminer is a popular, lightweight database management tool that can be used to manage various types of databases. To install Adminer on Ubuntu 20.04 LTS, you can use the following steps: Create a new directory for Adminer in the web root directory by running the command: sudo mkdir /var/www/html/adminer Download the latest version of Adminer … Read more

To install Vim on a CentOS or RHEL 8 system using the dnf package manager, you can use the following command: sudo dnf install vim Alternatively, if you are using the yum package manager, you can use the following command: sudo yum install vim Both dnf and yum use the same package repositories, so either … Read more

When Nginx is being used as a reverse proxy, the client’s IP address is usually passed to the backend server in the X-Real-IP header. To restore the real IP address in Nginx, you can add the following configuration to your Nginx server block: set_real_ip_from proxy_ip; real_ip_header X-Real-IP; Where proxy_ip is the IP address of the … Read more

To secure Apache with mod_md and Let’s Encrypt on Ubuntu 20.04 LTS, you can use the following steps: Install the necessary dependencies by running the command: sudo apt install -y apache2 certbot python3-certbot-apache Enable the mod_md module by running the command: sudo a2enmod md Create a new directory to store the Let’s Encrypt certificates by … Read more