CentOS 8 Error: Failed to download metadata for repo ‘appstream’

When updating packages on CentOS 8 server, I got the following error This is because CentOS 8 have reached its

How to install NVIDIA CUDA on Debian 10

CUDA® is a parallel computing platform and programming model developed by NVIDIA for general computing on graphical processing units (GPUs).



Allow CloudFlare IP addresses with ipset

Allow CloudFlare IP addresses with ipset

IP sets are a framework inside the Linux kernel, which can be administered by the ipset utility. Depending on the

r1soft get-module segmentation fault

When installing r1soft kernel module, I got the following error This was on a Debian server with 4.19.0-20-amd64 kernel. To


How to convert images to webp format in Ubuntu

Webp is a new image format for the web. It can be used on websites for the fast and efficient

How to install MySQL 5.7 on CentOS 7 Server

To install MySQL 5.7 on CentOS 7 server, install the repository import MySQL GPG key with Install MySQL with the


Install CSF firewall on Ubuntu Server

First, install libwww-perl package needed for CSF firewall Install CSF with Change following settings in csf.conf file If you need

Configure VPS IP address in OneProvider Server

If you are running virtualization software like Proxmox, KVM, or VMWare ESXi on the OneProvider server, you need to order

Linux groups

To see lists all groups that a user is in, run Example To add a user to a group, run

Drupal 7 Enable/Disable Maintenance Mode

To disable maintenance mode in drupal 7.x run the command Example To Enable Maintenance mode, run

puttygen: error loading x.ppk: PuTTY key format too new

Putty saves ssh key in file with .ppk extension. To use the key on Linux systems, you need to convert