October 2020 - Page 8 of 69

Common Problems 117411

Ubuntu 20.04 LTS apt Lock Contention During Auto Updates

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: 20.04 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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Common Problems 113540

Windows Server 2012 R2 — sIDHistory cleanup needed to retire deprecated SIDs after migration — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 06 July 2027 Affected versions: Windows Server 2012 R2 📖 ~2 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 […]

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How to Set Up Port Knocking on SLES 12 — step-by-step SUSE Linux Enterprise 12 tutorial on Progressive Robot

How to Set Up Port Knocking on SLES 12

Introduction This tutorial covers How to Set Up Port Knocking on SLES 12 on SLES 12. SLES 12 (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 12 system is up to date: zypper […]

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Entendendo o GOPATH — step-by-step Programming tutorial on Progressive Robot

Entendendo o GOPATH

Este artigo irá orientá-lo para entender o que é o GOPATH, como ele funciona e como configurá-lo. Este é um passo crucial para configurar um ambiente de desenvolvimento em Go, além de entender como o Go encontra, instala e compila arquivos fonte. Neste artigo, usaremos o…

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Managed Databases Connection Pools and PostgreSQL Benchmarking Using pgbench — step-by-step Databases tutorial on Progressive Robot

Managed Databases Connection Pools and PostgreSQL Benchmarking Using pgbench

In this tutorial we’ll use `pgbench`, PostgreSQL’s built-in benchmarking tool, to run load tests on a the cloud provider Managed PostgreSQL Database. We’ll dive in to connection pools, describe how they work, and show how to create one using the Cloud Control panel. Finally, using results from the `pgbench` tests, we’ll demonstrate how using a connection pool can be an inexpensive method of increasing database throughput.

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Java Access Modifiers — step-by-step Programming tutorial on Progressive Robot

Java Access Modifiers

URL: https://www.progressiverobot.com/java-access-modifiers/ Java access modifiers are used to provide access control in java. Java provides access control through three keywords – private, protected and public. We are not required to use these access modifiers always, so we have another one namely "default access", "package-private" or "no modifier". Java Access Modifiers ![java access modifiers, protected, private, […]

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FreeBSD 12 — payara — multiple vulnerabilities (15 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — payara — multiple vulnerabilities (15 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: Payara — path trasversal flaw via either loc/con parameters in Eclipse Mojarra Related CVEs: CVE-2016-1000031 CVE-2016-5528 CVE-2017-12615 CVE-2017-3239 CVE-2017-3247 CVE-2017-3249 CVE-2017-3250 CVE-2018-14371  +7 more Upstream summary: Payara Releases reports: The […]

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How To Use WP-CLI v2 to Manage Your WordPress Site from the Command Line — step-by-step Web Servers tutorial on Progressive Robot

How To Use WP-CLI v2 to Manage Your WordPress Site from the Command Line

In this tutorial, you’ll use many of the features of WP-CLI and discover how it can fit into your workflow. You’ll cover common operations such as managing plugins and themes, creating content, working with the database, and updating WordPress. The capabilities of WP-CLI go beyond this tutorial; however, you’ll be able to transfer how to work with thes more common options to other WP-CLI features.

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How to Install Netdata on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install Netdata on Oracle Linux 8

Introduction How to Install Netdata on Oracle Linux 8 on Oracle Linux 8 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration is reproducible […]

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