Traefik is a modern cloud-native reverse proxy and load balancer that can automatically discover services, obtain and renew TLS certificates via Let’s Encrypt, and expose a real-time dashboard — all without restarting when configuration changes. Unlike Nginx or HAProxy, Traefik reads its routing rules from provider backends such as Docker labels, Kubernetes annotations, or plain […]
A highly available web stack ensures that your application remains accessible even when one of your servers fails. Keepalived implements the Virtual Router Redundancy Protocol (VRRP) on Linux, allowing a floating Virtual IP (VIP) address to migrate automatically between a master and one or more backup servers within seconds of a failure. When combined with […]
Huge pages reduce the overhead of virtual memory management by using larger memory page sizes — typically 2 MB instead of the default 4 KB. For memory-intensive databases such as Oracle, PostgreSQL, and MySQL, huge pages eliminate millions of Translation Lookaside Buffer (TLB) misses per second, lower page table walk overhead, and prevent the kernel […]
The perf tool is a powerful Linux profiling framework built directly into the kernel, capable of sampling CPU performance counters, tracing system calls, and generating flame graphs that reveal exactly where an application spends its time. On RHEL 8, perf is packaged in the standard repositories and integrates with the kernel’s built-in performance monitoring units […]
Linux kernel parameters control how your system allocates resources, handles network connections, and manages memory. On RHEL 8, the sysctl utility provides a clean interface for reading and writing these parameters at runtime, while drop-in configuration files under /etc/sysctl.d/ make changes persistent across reboots. Properly tuned kernel parameters can significantly improve throughput, reduce latency, and […]
IEEE 802.1Q VLAN tagging allows a single physical network interface to carry traffic for multiple logically isolated networks by inserting a 4-byte VLAN tag into Ethernet frames. This is essential in virtualization environments, network segmentation architectures, and anywhere a single uplink must serve multiple subnets. On RHEL 8, NetworkManager handles 802.1Q VLAN interfaces natively through […]
Pacemaker and Corosync together form the de facto high-availability (HA) cluster stack for Linux. Corosync provides the cluster messaging and quorum layer, while Pacemaker manages resources — ensuring that services like virtual IP addresses and web servers start, stop, and migrate between nodes according to defined constraints. On RHEL 8, both packages are available through […]
Network bonding and teaming both combine multiple physical network interfaces into a single logical link, providing redundancy, increased throughput, or both. On RHEL 8, NetworkManager is the recommended way to configure both technologies using the nmcli command-line tool — no manual edits to legacy ifcfg files required. This tutorial covers creating an active-backup bond with […]
ZFS is a combined file system and logical volume manager renowned for its data integrity guarantees, transparent compression, built-in snapshotting, and copy-on-write architecture. While ZFS is not included in the RHEL 8 kernel, the OpenZFS project provides compatible DKMS packages that build the kernel module on demand. This tutorial covers adding the OpenZFS repository, installing […]
Border Gateway Protocol (BGP) is the routing protocol that powers the internet, exchanging routing information between autonomous systems (AS). On RHEL 8, the BIRD Internet Routing Daemon provides a lightweight, production-grade BGP implementation available through the EPEL repository. This tutorial walks through installing BIRD, writing a BGP configuration with neighbor relationships and route filters, verifying […]
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