How to Detect Rootkits with rkhunter and chkrootkit on RHEL 7 A rootkit is a collection of malicious software designed to maintain persistent, hidden access to a compromised system while concealing its presence from the administrator and standard system tools. Once installed, rootkits can replace core binaries, hide processes and network connections, and exfiltrate data […]
How to Configure nftables Firewall on RHEL 7 nftables is the modern successor to iptables, combining the functionality of iptables, ip6tables, arptables, and ebtables into a single, unified framework with a cleaner syntax, better performance, and native support for atomic rule replacement. While firewalld is the default front end on RHEL 7, nftables is available […]
How to Configure iptables Firewall Rules on RHEL 7 RHEL 7 ships with firewalld as the default firewall management layer, but many system administrators prefer to work directly with iptables, the underlying Linux netfilter framework. iptables provides precise, stateful packet filtering through a chain-based rule system and is the right choice when you need fine-grained […]
How to Set Up Two-Factor Authentication for SSH with Google Authenticator on RHEL 7 Password-based SSH authentication is vulnerable to brute-force attacks, credential stuffing, and phishing. Adding a second authentication factor — a time-based one-time password (TOTP) generated by an app like Google Authenticator or Authy — dramatically reduces this risk. Even if an attacker […]
How to Audit Linux Security with Lynis on RHEL 7 Maintaining a secure Linux server requires more than installing updates and setting strong passwords. A comprehensive security audit reveals configuration weaknesses, missing hardening measures, and potential vulnerabilities before attackers can exploit them. Lynis is an open-source security auditing tool that performs an in-depth scan of […]
How to Configure SELinux on RHEL 7 SELinux (Security-Enhanced Linux) is a mandatory access control (MAC) system built into the Linux kernel and enabled by default on every RHEL 7 installation. Unlike traditional Unix discretionary access control (DAC), which lets file owners decide who can access their files, SELinux enforces a policy defined by the […]
How to Install ClamAV Antivirus on RHEL 7 ClamAV is the leading open-source antivirus engine used on Linux servers, primarily for scanning files shared with Windows clients, email attachments passing through mail gateways, and uploaded content on web servers. While RHEL 7 itself is rarely the target of self-propagating malware, compliance frameworks such as PCI-DSS, […]
How to Install and Configure OpenVPN on RHEL 7 OpenVPN is one of the most widely deployed VPN solutions in the enterprise, valued for its flexibility, strong encryption, and compatibility across nearly every operating system. On RHEL 7, OpenVPN is not included in the base repositories but is available from EPEL. Building a proper PKI […]
How to Set Up WireGuard VPN on RHEL 7 WireGuard is a modern, high-performance VPN protocol built directly into the Linux kernel (from 5.6 onward) and available as a DKMS module on older kernels like those shipped with RHEL 7. Compared to OpenVPN and IPsec, WireGuard has a dramatically smaller codebase, faster handshake times, and […]
How to Harden SSH on RHEL 7 SSH (Secure Shell) is the primary remote administration protocol for RHEL 7 servers, and by default its configuration leaves several attack vectors open. Brute-force attacks against exposed SSH ports are constant on any internet-facing host, making SSH hardening one of the first tasks every RHEL 7 administrator should […]
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