Postfix is a high-performance, security-focused Mail Transfer Agent (MTA) that ships with RHEL 8 and is the default replacement for Sendmail. It handles the delivery of outbound email and, when configured correctly, accepts inbound mail for local users. Understanding Postfix is foundational for any RHEL administrator who needs to send system alerts, application notifications, or […]
Introduction Deploying configure strongswan ipsec on debian 11 on a Debian 11 Bullseye machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Ensure Debian 11 […]
Running your own DNS server gives you full control over name resolution for internal infrastructure and reduces dependency on external resolvers. BIND9 (Berkeley Internet Name Domain) is the most widely deployed DNS server in the world and is available in the default RHEL 8 repositories. On RHEL 8, the package is split into bind (the […]
Introduction This guide explains how to Set Up WireGuard VPN on Debian 11 on Debian 11 Bullseye. Debian Bullseye uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 11 install with the […]
Introduction Debian 11 Bullseye is built around the ethos of stability and free software. Setting up configure openvpn server on debian 11 on Bullseye leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Bullseye freeze. Follow each step carefully and the […]
Assigning a static IP address ensures your RHEL 8 server is always reachable at a predictable address — essential for services like DNS, mail, or web hosting. On RHEL 8, NetworkManager is the default network management service and the preferred tool for making persistent network changes. Using nmcli from the command line lets you configure […]
Introduction Debian 11 Bullseye is built around the ethos of stability and free software. Setting up set up kea dhcp server on debian 11 on Bullseye leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Bullseye freeze. Follow each step carefully […]
Reliable backups are the last line of defense against data loss from hardware failures, ransomware, or accidental deletion, and on RHEL 8 the combination of rsync and cron provides a powerful, scriptable, and dependency-free backup pipeline. rsync is a fast incremental file-transfer utility that only copies changed data, making it efficient for both local and […]
Introduction This guide explains how to Install and Configure ISC DHCP Server on Debian 11 on Debian 11 Bullseye. Debian Bullseye uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 11 install […]
Software RAID using mdadm provides redundant disk storage without requiring a hardware RAID controller, making it ideal for cost-effective high-availability storage on RHEL 8. RAID 1 (mirroring) writes identical data to two disks simultaneously; if one disk fails, the other continues serving data without interruption and the array can be rebuilt onto a replacement drive. […]
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