Capacity Planning

How to Take a System Snapshot Before Upgrades on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Take a System Snapshot Before Upgrades on RHEL 10

Introduction Setting up take a system snapshot before upgrades on a RHEL 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Take a System Snapshot Before Upgrades on RHEL 10, with all the commands you need, the SELinux and firewalld considerations to keep in […]

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Common Problems 115919

Ubuntu 26.04 LTS – snapd service fails and snap applications cannot launch

🟠 High   ⏱ 5–30 min  Last verified: 3 June 2026 Affected versions: Ubuntu 26.04 LTS Ubuntu 26.04 Ubuntu 26.04.1 📖 ~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 […]

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How to Install Java OpenJDK 21 on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Install Java OpenJDK 21 on RHEL 10

Introduction This tutorial demonstrates how to Install Java OpenJDK 21 on RHEL 10 on RHEL 10. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered RHEL 10 system with the default AppStream repositories […]

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How to Perform a Minimal Installation of RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Perform a Minimal Installation of RHEL 10

Introduction Setting up perform a minimal installation of rhel 10 on a RHEL 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Perform a Minimal Installation of RHEL 10, with all the commands you need, the SELinux and firewalld considerations to keep in mind, […]

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How to Configure Unattended Upgrades on Ubuntu 26.04 — step-by-step Linux tutorial on Progressive Robot

How to Monitor System Resources on Ubuntu 26.04

Knowing how your server uses CPU, memory, disk, and network resources is essential for capacity planning and troubleshooting. Ubuntu 26.04 LTS comes with several built-in tools and supports popular third-party monitors. This guide covers the most useful commands and tools for resource monitoring. Tested and valid on: Ubuntu 26.04 LTS Prerequisites Ubuntu 26.04 LTS server […]

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How to Monitor MySQL with Prometheus mysqld_exporter on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Monitor MySQL with Prometheus mysqld_exporter on RHEL 9

MySQL’s built-in metrics are powerful but not easily scraped. Prometheus mysqld_exporter is the standard exporter that translates MySQL status variables, InnoDB engine metrics, and replication lag statistics into the Prometheus exposition format. Combined with Grafana, the mysqld_exporter provides real-time dashboards covering query throughput, connection pool usage, InnoDB buffer pool hit rates, disk I/O, and replication […]

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How to Install ClamAV Antivirus on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Install ClamAV Antivirus on RHEL 10

Introduction RHEL 10 ships with a stable, security-hardened base that makes deploying install clamav antivirus both straightforward and auditable. This tutorial covers the complete procedure for how to Install ClamAV Antivirus on RHEL 10, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. Prerequisites Before you begin, […]

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How to Install Valkey on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Install Valkey on RHEL 10

Introduction Setting up install valkey on a RHEL 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Install Valkey on RHEL 10, with all the commands you need, the SELinux and firewalld considerations to keep in mind, and how to validate the result on […]

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How to Configure Static File Serving with Nginx on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Configure Static File Serving with Nginx on RHEL 10

Introduction RHEL 10 ships with a stable, security-hardened base that makes deploying configure static file serving with nginx both straightforward and auditable. This tutorial covers the complete procedure for how to Configure Static File Serving with Nginx on RHEL 10, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for […]

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Common Problems 122175

PF State Table Exhaustion Under Traffic Spikes

🟡 Medium   ⏱ 5–30 min  Last verified: 25 May 2026 Affected versions: FreeBSD 15 📖 ~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 & […]

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