How to Set Up LDAP with OpenLDAP on RHEL 7 OpenLDAP is the most widely deployed open-source implementation of the Lightweight Directory Access Protocol and serves as the foundation for centralized authentication, authorization, and user directory services across Linux environments. On RHEL 7, OpenLDAP is available directly from the base repositories and integrates tightly with […]
How to Configure IPv6 Dual-Stack Networking on RHEL 7 IPv6 adoption has accelerated steadily, yet most production servers still need to serve IPv4 clients simultaneously. A dual-stack configuration allows a single network interface to carry both protocol versions concurrently, eliminating the need for tunneling or translation layers. On RHEL 7, NetworkManager provides the authoritative way […]
How to Install Certbot and Automate Let’s Encrypt Renewals on RHEL 7 Securing your web server with a trusted TLS certificate is no longer optional — it is a baseline requirement for any production site. Let’s Encrypt provides free, automated, and domain-validated certificates, and Certbot is the official command-line client that manages the entire lifecycle: […]
How to Install and Configure Traefik Reverse Proxy on RHEL 7 Traefik is a modern, cloud-native reverse proxy and load balancer that differentiates itself from Nginx and HAProxy through its dynamic configuration model — routing rules can be updated at runtime without restarting the proxy. Originally designed for microservices and Docker environments, Traefik works equally […]
How to Set Up a Highly Available Web Stack with Keepalived on RHEL 7 High availability eliminates single points of failure by ensuring that if one server goes down, another takes over seamlessly. For web servers, one of the most common HA patterns is a Virtual IP (VIP) address that floats between two or more […]
How to Configure Huge Pages for Database Performance on RHEL 7 Database engines — particularly Oracle, PostgreSQL, and MySQL/InnoDB — allocate and manage large memory pools for their buffer caches and shared memory segments. By default, the Linux kernel manages memory in 4 KB pages, which means that a 32 GB database buffer pool requires […]
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 […]
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 […]
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 […]
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 […]
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