Networking

How to Configure Kubernetes Persistent Volumes and Storage Classes on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Kubernetes Persistent Volumes and Storage Classes on RHEL 7

How to Configure Kubernetes Persistent Volumes and Storage Classes on RHEL 7 By default, storage inside a Kubernetes Pod is ephemeral — when a Pod restarts or is rescheduled, all data written to the container filesystem is lost. For applications like databases, file servers, and message queues that require durable storage, Kubernetes provides a storage […]

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Common Problems 115067

SSSD Offline Cache Used Unexpectedly for Domain Users

🟡 Medium   ⏱ 5–30 min  Last verified: 20 June 2019 📖 ~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 Install and Configure BIND9 DNS Server on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install and Configure BIND9 DNS Server on Debian 9

Introduction Debian 9 Stretch is built around the ethos of stability and free software. Setting up install and configure bind9 dns server on debian 9 on Stretch leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Stretch freeze. Follow each step […]

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How to Configure Nginx Server Blocks on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure Nginx Server Blocks on Debian 9

Introduction Debian 9 Stretch is built around the ethos of stability and free software. Setting up configure nginx server blocks on debian 9 on Stretch leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Stretch freeze. Follow each step carefully and […]

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Common Problems 117938

Ubuntu 18.04 LTS – netplan apply fails due to YAML indentation errors – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 18 June 2019 Affected versions: Ubuntu 18.04 LTS 📖 ~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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How to Install Zabbix Agent on Windows Server 2012 R2 for Monitoring — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Install Zabbix Agent on Windows Server 2012 R2 for Monitoring

How to Install Zabbix Agent on Windows Server 2012 R2 for Monitoring Zabbix is a widely deployed open-source monitoring platform that provides comprehensive monitoring for servers, applications, databases, and network devices. The Zabbix agent installed on Windows Server 2012 R2 collects system metrics, monitors services, checks log files for patterns, and executes custom checks, all […]

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Common Problems 118926

Ubuntu 14.04 LTS – unattended-upgrades causes sustained CPU usage – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 17 June 2019 Affected versions: Ubuntu 14.04 LTS 📖 ~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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How to Move a WPAR Between Systems on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Move a WPAR Between Systems 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 move a wpar between systems on ibm aix 7.2 […]

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How to Manage Systemd Services and Units on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Manage Systemd Services and Units on RHEL 7

How to Manage Systemd Services and Units on RHEL 7 Red Hat Enterprise Linux 7 made a significant shift from the traditional SysVinit and Upstart initialization systems to systemd as the default init system. Systemd is a comprehensive system and service manager that controls how services start, stop, and interact with the rest of the […]

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How to Configure Nginx as a Reverse Proxy on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure Nginx as a Reverse Proxy on RHEL 8

Nginx is a high-performance web server that also excels as a reverse proxy, sitting in front of application servers and forwarding client requests to backend services running on internal ports. Using Nginx as a reverse proxy on RHEL 8 allows you to serve Node.js, Python, Java, or any HTTP-based application behind a clean public-facing endpoint […]

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