Fixing RPM Database Desynchronization on RHEL
Recently, we encountered a case on a RHEL 9 machine where an RPM query did not show any information about installed package even though the package files wer...
Recent posts
Inside Linux TCP: From Handshake to Reset or Close
TCP is the backbone of network communication in Linux systems. It’s a connection-oriented protocol that ensures reliable data exchange between a sender and a...
RabbitMQ Monitoring: Pushing Queue Metrics to Elasticsearch with Python script
Monitoring RabbitMQ queues is critical for maintaining the health and performance of the RabbitMQ distributed system. This post is about a Python script that...
Scalable CI/CD with Jenkins and Docker Cloud Agents
A Jenkins cloud agent using Docker refers to dynamically provisioning Jenkins build agents (also called slaves or nodes) in Docker containers—typically on de...
Implementing Mutual TLS (mTLS) Authentication with OpenSSL: A Step-by-Step Guide
This article explores mutual Transport Layer Security (mTLS) authentication and how OpenSSL can facilitate its implementation. Also known as client-server au...
Unassigned shards in Elasticsearch 7 and 8
There are multiple reasons why shards might get unassigned, ranging from misconfigured allocation settings to lack of disk space.
Percona XtraDB Multi-Master Replication cluster setup between 3 nodes
This guide describes the steps to establish a Percona XtraDB Cluster v8.0 among three Ubuntu 22.04 nodes.
Site-to-Site VPN between Mikrotik router and Ubuntu 22.04 through strongSwan using IPsec IKEv2
We will configure a site-to-site IPsec IKEv2 tunnel between the Mikrotik Router and the StrongSwan server. This will enable secure communication between devi...