Cpu Memory

How to Use nmon for Performance Monitoring on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Use nmon for Performance Monitoring on IBM AIX 7.1

Introduction IBM AIX 7.1 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to use nmon for performance monitoring on ibm aix 7.1 […]

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How to Use AIX Memory Affinity on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Use AIX Memory Affinity on IBM AIX 7.2

Introduction IBM AIX 7.2 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.2 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to use aix memory affinity on ibm aix 7.2 on […]

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How to Configure Persistent Volumes in Kubernetes on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure Persistent Volumes in Kubernetes on Debian 10

Introduction This guide explains how to Configure Persistent Volumes in Kubernetes on Debian 10 on Debian 10 Buster. Debian Buster uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 10 install with […]

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How to Configure GitLab CE on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure GitLab CE on Debian 10

Introduction This guide explains how to Configure GitLab CE on Debian 10 on Debian 10 Buster. Debian Buster uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 10 install with the standard […]

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How to Enable AppArmor on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Enable AppArmor on Debian 10

Introduction Deploying enable apparmor on debian 10 on a Debian 10 Buster machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Before you begin, ensure […]

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How to Set Up DRBD Block Replication on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up DRBD Block Replication on Debian 10

Introduction This guide explains how to Set Up DRBD Block Replication on Debian 10 on Debian 10 Buster. Debian Buster uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 10 install with […]

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Common Problems 115104

kdump Not Capturing Kernel Crash Dumps

🟡 Medium   ⏱ 5–30 min  Last verified: 27 July 2020 📖 ~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 & Cross-Refs References & Further […]

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How to Deploy Applications with Docker Compose on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Deploy Applications with Docker Compose on RHEL 7

How to Deploy Applications with Docker Compose on RHEL 7 Docker Compose lets you define and run multi-container applications using a single YAML file. Instead of managing individual docker run commands for each service, you describe the entire application stack — web server, database, cache, message queue — in a docker-compose.yml file and bring everything […]

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How to Configure Nginx Rate Limiting and Connection Throttling on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Nginx Rate Limiting and Connection Throttling on RHEL 7

How to Configure Nginx Rate Limiting and Connection Throttling on RHEL 7 Uncontrolled traffic is one of the most common threats to web server stability. Whether the source is a poorly written client polling too aggressively, a scraper harvesting your content, or a low-volume denial-of-service attack, allowing unlimited requests to reach your application or upstream […]

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Common Problems 119077

Ubuntu 14.04 LTS – high CPU from kswapd due memory pressure

🟠 High   ⏱ 5–30 min  Last verified: 24 July 2020 Affected versions: Ubuntu 14.04 LTS Ubuntu 14.04 Ubuntu 14.04.6 📖 ~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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