How to Setup DKIM (DomainKeys) with Postfix on CentOS

Step 1 – Install DKIM-milter First make sure you have enabled EPEL repository in your system. CentOS 8: $ yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm $ dnf config-manager --set-enabled PowerTools CentOS 7: $ yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm After that install dkim-milter package using following…

How to Backup a Linux VPS to an Amazon AWS S3

Prerequisites You should already have an account with AWS. S3 Bucket — How Do I Create an S3 Bucket? Access keys (access key ID and secret access key) need to be generate from AWS Management Console — Understanding and Getting Your Security Credentials Step 1 — Installing…

How To Install MariaDB on CentOS 8

Step 1 — Installing MariaDB First, use dnf to install the MariaDB package: $ sudo dnf install mariadb-server You will be asked to confirm the action. Press y then ENTER to proceed. Once the installation is complete, start the service with systemctl:      …

How To Install Nginx on Ubuntu 18.04

Prerequisites Before you begin this guide, you should have a regular, non-root user with sudo privileges configured on your Ubuntu 18.04 server. If you are logged in as root instead, you can drop the sudo portion of all the following commands, but they will work…

How To Add and Delete Users on CentOS 8

Prerequisites This tutorial assumes you are logged into a CentOS 8 server with a non-root sudo-enabled user. If you are logged in as root instead, you can drop the sudo portion of all the following commands, but they will work either way. Adding Users Throughout…