How to Deploy a Ruby on Rails Application on RHEL 7 Ruby on Rails is a full-featured web application framework that follows the Model-View-Controller (MVC) pattern and emphasizes convention over configuration. Deploying a Rails application on RHEL 7 in a production-grade configuration requires several components working together: Rails itself running under Puma (a multi-threaded Ruby […]
The most common cause of crashes in MySQL is that it stopped or failed to start due to insufficient memory. To check this, you will need to review the MySQL error log after a crash. First, attempt to start the MySQL server by typing: sudo systemctl start mysql Then…
Introduction This tutorial covers How to Configure PostgreSQL Replication on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 15 system is up to date: zypper refresh […]
🟠 High ⏱ 5–30 min Last verified: 27 June 2019 Affected versions: RHEL 7 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]
🟢 Low ⏱ 5–15 min Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read • Source: SUSE advisory openSUSE-SU-2020:1717-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-16707 Upstream summary: Hunspell 1.7.0 has an invalid read operation in SuggestMgr::leftcommonsubstring in suggestmgr.cxx. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]
Okteto is a development platform used to streamline the development process for Kubernetes applications. In this tutorial, you will create a Python application and deploy it on Kubernetes using Okteto.
When you share links on social media platforms, they’ll often be presented with rich imagery and a nicely formatted title, summary, and link, instead of plain text. You can add these rich media social sharing capabilities to your site by including certain meta tags in the head of your HTML document. This tutorial will show you how to implement both Twitter Card and Open Graph social metadata.
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: OpenBSD 7.5 📖 ~4 min read • Source: OpenBSD 7.5 errata 015_wg Errata topic: Reliability: wg (All architectures) Issued: January 10, 2025 Upstream summary: Traffic sent over wg(4) could result in kernel crash. Table of contents Symptom & Impact Environment & Reproduction […]
Grafana is the leading graph and dashboard builder for visualizing time series infrastructure and application metrics, but many use it in other domains including industrial sensors, home automation, weather, and process control. It provides a powerful and elegant way to create, explore, and share dashboards and data with your team and the world. In this tutorial, you will learn how to add Prometheus as a data source to your Grafana instance and install a pre-configured Prometheus Dashboard.
Introduction to Active Directory Auditing Active Directory is the authentication and authorization backbone of most Windows enterprise environments. Any changes to AD objects—user creations, group membership changes, permission modifications, login failures—can indicate insider threats, compromised accounts, or misconfigurations. Windows Server 2019 provides granular auditing capabilities through Advanced Audit Policy that let you capture exactly what […]
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