How to Profile Application Performance with perf on RHEL 7 Performance bottlenecks in production applications are notoriously difficult to diagnose using traditional monitoring tools alone. CPU usage metrics tell you that a system is busy but rarely tell you where the work is happening inside your application. The perf subsystem, built directly into the Linux […]
Introduction Deploying configure nginx as a reverse proxy on freebsd 14 on a FreeBSD 14 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within […]
How to Tune Linux Kernel Parameters with sysctl on RHEL 7 The Linux kernel exposes hundreds of tunable parameters through the sysctl interface, allowing system administrators to adjust network behavior, memory management, file descriptor limits, and security policies without recompiling the kernel or rebooting. On Red Hat Enterprise Linux 7, these parameters are managed through […]
Introduction How to Secure Apache with Let’s Encrypt on FreeBSD 14 is a core administration task for any FreeBSD 14 server operator. FreeBSD 14 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for […]
How to Configure VLAN Tagging with 802.1Q on RHEL 7 VLANs (Virtual Local Area Networks) allow a single physical network interface to participate in multiple logically isolated network segments simultaneously. The 802.1Q standard defines how Ethernet frames are tagged with a 12-bit VLAN ID, enabling switches and hosts to segregate traffic without requiring dedicated physical […]
Introduction This guide explains how to Secure Nginx with Let’s Encrypt on FreeBSD 14 on FreeBSD 14. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for […]
Introduction Deploying configure apache virtual hosts on freebsd 14 on a FreeBSD 14 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard […]
How to Set Up Pacemaker and Corosync for High Availability on RHEL 7 High availability (HA) clustering prevents individual server failures from causing service outages by automatically detecting node failures and restarting workloads on surviving nodes. On RHEL 7, the standard HA stack is built from three components: Corosync, which provides reliable cluster messaging and […]
Introduction This guide explains how to Configure Nginx Virtual Hosts on FreeBSD 14 on FreeBSD 14. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for fine-grained […]
How to Configure Network Bonding and Teaming on RHEL 7 Network link aggregation allows multiple physical network interfaces to be combined into a single logical interface, providing increased throughput and fault tolerance. RHEL 7 supports two distinct kernel-level mechanisms for achieving this: the older bonding driver, which has been part of the Linux kernel for […]
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