PgBouncer is a lightweight connection pooler for PostgreSQL that sits between your application and the database server, reusing a small pool of backend connections across many client requests. Without a connection pooler, PostgreSQL must fork a new backend process for every client connection, consuming memory and CPU as connection counts grow. On RHEL 8, PgBouncer […]
DRBD (Distributed Replicated Block Device) provides synchronous, block-level replication between two Linux servers, making it a foundational technology for high-availability storage clusters. Often described as “RAID 1 over the network,” DRBD mirrors every write to both nodes in real time, so either node can take over if the other fails. On RHEL 8, DRBD is […]
PostgreSQL provides two complementary tools for database backups: pg_dump and pg_basebackup. pg_dump takes logical backups of individual databases or selected objects and can restore to a different PostgreSQL version or host. pg_basebackup takes a physical, byte-for-byte copy of the entire data directory, which is the foundation of streaming replication and point-in-time recovery. This tutorial covers […]
How to Configure Log Rotation with logrotate on RHEL 7 Log files are essential for diagnosing system problems, tracking security events, and auditing application behavior. However, without proper management, log files grow without bound and can fill your disk, causing service outages and making historical logs difficult to navigate. logrotate is the standard log rotation […]
Jaeger is an open-source, end-to-end distributed tracing system originally developed by Uber Technologies and now a CNCF graduated project. It lets you follow a single user request as it propagates across dozens of microservices, measure the latency contribution of each span, and pinpoint the exact service or database call responsible for a slowdown. On RHEL […]
How to Install and Configure Dovecot IMAP Server on RHEL 7 Dovecot is a secure, high-performance IMAP and POP3 server that integrates seamlessly with Postfix on RHEL 7. While Postfix handles the transport of mail (sending and receiving via SMTP), Dovecot provides the retrieval layer — allowing mail clients such as Thunderbird, Outlook, or Apple […]
Let’s Encrypt provides free, trusted TLS certificates, and Certbot is the official client for obtaining and renewing them automatically. On RHEL 8, Certbot is available through the EPEL repository and integrates tightly with both Nginx and Apache via dedicated plugins. Automating renewals with the built-in systemd timer ensures your certificates never expire without manual intervention. […]
How to Install and Configure Envoy Proxy on RHEL 7 Envoy Proxy has become a cornerstone of modern service mesh architectures, used as the data plane in Istio, the sidecar in Consul Connect, and the edge proxy behind many large-scale APIs. Written in C++ and designed for cloud-native workloads, Envoy provides L4/L7 load balancing, health […]
How to Install Rust and Cargo on RHEL 7 Rust is a systems programming language designed for safety, speed, and concurrency. It has quickly become one of the most loved languages among developers due to its memory safety guarantees, zero-cost abstractions, and powerful type system. Unlike garbage-collected languages, Rust achieves memory safety at compile time […]
SSL/TLS certificates are the foundation of encrypted communications on the internet, authenticating servers and encrypting data in transit. On RHEL 8, OpenSSL provides a full-featured toolkit for creating your own Certificate Authority, generating server certificates, and managing the entire certificate lifecycle. Understanding this process is essential for securing internal services without relying on external providers. […]
