Change Postfix Port
I was trying to route emails from one MTA to postfix, so I needed to change the port that postfix was using, so this is what I did: First, please backup the file in case you break something cp …
How to Start OpenVPN Automatically at Boot on CentOS & RHEL (systemd & SysVinit)
When configuring an unattended Linux server to maintain a persistent site-to-site or client OpenVPN tunnel, failing to register the profile with the init system means the VPN tunnel stays down after …
Update WordPress URL in MySQL & WP-CLI Without Breaking Serialized Data
Migrating a WordPress site to a new domain or switching from http:// to https:// requires updating hardcoded URLs stored across core MySQL tables (wp_options, wp_posts, and wp_postmeta). Below are …
Create and Tune a Linux Swap File on CentOS, RHEL & Rocky Linux
Small cloud instances (such as AWS EC2 t2.micro or t3.micro nodes with 1 GB of RAM) commonly ship without a swap partition enabled. When memory spikes during package builds, database queries, or cron …