Cpu Memory

Common Problems 121204

Debian 10: OOM killer terminates Java service under memory pressure

🔴 Critical   ⏱ 5–30 min  Last verified: 27 May 2020 Affected versions: Debian 10 📖 ~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 & […]

Read more
How to Install Harbor Container Registry on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install Harbor Container Registry on Debian 10

Introduction How to Install Harbor Container Registry on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 10. […]

Read more
How to Install Elasticsearch on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Install Elasticsearch on RHEL 8

Elasticsearch is a distributed, RESTful search and analytics engine capable of handling large volumes of structured and unstructured data in near real time. It is the core component of the Elastic Stack, widely used for log aggregation, full-text search, and observability pipelines. On RHEL 8, installing Elasticsearch requires adding the official Elastic repository and configuring […]

Read more
How to Install and Configure Apache Tomcat on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Install and Configure Apache Tomcat on Windows Server 2012 R2

How to Install and Configure Apache Tomcat on Windows Server 2012 R2 Apache Tomcat is the world’s most widely deployed open-source Java web application server, providing a Java Servlet, JavaServer Pages (JSP), and Java EL runtime environment. On Windows Server 2012 R2, Tomcat runs as a Windows service, making it suitable for hosting Java EE […]

Read more
Common Problems 113604

Windows Server 2016 – Hyper-V VM networking packet loss caused by VMQ mismatch – Fix & Prevention (FIX-PREVENTION-2)

🟡 Medium   ⏱ 5–30 min  Last verified: 22 May 2020 Affected versions: Windows Server 2016 📖 ~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 […]

Read more
How to Create Generation 2 Virtual Machines in Hyper-V on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Create Generation 2 Virtual Machines in Hyper-V on Windows Server 2016

How to Set Up Windows Server 2016 Hyper-V Generation 2 VMs Hyper-V supports two types of virtual machines: Generation 1 and Generation 2. Generation 2 virtual machines, introduced in Windows Server 2012 R2 and enhanced in Windows Server 2016, provide a modern UEFI-based firmware environment, Secure Boot support, faster boot times, and compatibility with the […]

Read more
How to Configure Disk Encryption with VeraCrypt on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure Disk Encryption with VeraCrypt on Debian 10

Introduction This guide explains how to Configure Disk Encryption with VeraCrypt 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 […]

Read more
How to Configure GitHub Actions Self-Hosted Runner on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Configure GitHub Actions Self-Hosted Runner on FreeBSD 12

Introduction This guide explains how to Configure GitHub Actions Self-Hosted Runner on FreeBSD 12 on FreeBSD 12. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for […]

Read more
How to Configure rkhunter Rootkit Scanner on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure rkhunter Rootkit Scanner on Debian 10

Introduction How to Configure rkhunter Rootkit Scanner on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 10. […]

Read more
How to Install Prometheus on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Install Prometheus on FreeBSD 12

Introduction Deploying install prometheus on freebsd 12 on a FreeBSD 12 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard base + […]

Read more
CHAT