Email authentication through DKIM, SPF, and DMARC is no longer optional — major providers like Gmail and Outlook reject or junk messages from servers that lack these records. DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing messages, SPF (Sender Policy Framework) publishes a DNS record declaring which servers may send mail for your […]
Dovecot is a fast, secure, and easy-to-configure IMAP and POP3 server that works seamlessly alongside Postfix on RHEL 9. Once Postfix is delivering incoming mail to a user’s Maildir, Dovecot allows mail clients such as Thunderbird or Outlook to retrieve those messages over IMAP or POP3 — with optional SSL/TLS encryption for both protocols. This […]
Postfix is a high-performance, open-source Mail Transfer Agent (MTA) that handles the sending and receiving of email over SMTP. It is the default MTA on many Linux distributions and integrates cleanly with the rest of the RHEL 9 mail stack, including Dovecot for IMAP delivery and OpenDKIM for email authentication. This tutorial covers installing Postfix, […]
BIND9 (Berkeley Internet Name Domain version 9) is the most widely deployed DNS server software in the world and is fully supported on RHEL 9 through the bind package. Running your own authoritative DNS server lets you resolve hostnames for domains you control without relying on a third-party provider. This tutorial covers installing BIND9, writing […]
NetworkManager is the default network management service on RHEL 9, and it provides a powerful command-line tool called nmcli for configuring network interfaces. Assigning a static IP address is a common requirement for servers that need a predictable, stable address on the network. This tutorial walks through every method available on RHEL 9 to configure […]
rsync is a fast and versatile file synchronization tool that transfers only changed bytes, making it extremely efficient for incremental backups. Combined with cron or a systemd timer, it forms the basis of a reliable automated backup system on RHEL 9 without requiring additional backup software. The –link-dest option enables space-efficient dated snapshots that appear […]
Software RAID (Redundant Array of Independent Disks) allows you to combine multiple physical disks into a single logical device that provides redundancy, performance, or both — entirely in software without dedicated hardware. On RHEL 9, mdadm is the standard tool for creating and managing software RAID arrays and is included in the default repositories. Unlike […]
Samba implements the SMB/CIFS protocol on Linux, enabling seamless file sharing between RHEL 9 servers and Windows clients — as well as other Linux systems. It is the go-to solution for mixed-OS environments where Windows users need to access Linux-hosted files using the same UNC paths and credential prompts they are accustomed to. On RHEL […]
NFS (Network File System) is the standard protocol for sharing directories over a network between Linux and Unix systems. On RHEL 9, NFS is provided by the nfs-utils package and integrates with firewalld and SELinux out of the box. NFS allows multiple clients to mount and access a shared directory on a server as if […]
Logical Volume Manager (LVM) is a flexible storage management layer built into the Linux kernel that lets you create, resize, and remove storage volumes without downtime. On RHEL 9, LVM is the default storage layout used during installation and is deeply integrated with the system tooling. Unlike partitions tied directly to physical disks, LVM abstracts […]
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