Linux

Common Problems 115059

RHEL 8 – logrotate Misconfiguration Leads to /var/log Disk Exhaustion

🟡 Medium   ⏱ 5–30 min  Last verified: 5 November 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 […]

Read more
How to Rewrite URLs with mod_rewrite for Apache on Ubuntu 18.04 — step-by-step Linux tutorial on Progressive Robot

How to Rewrite URLs with mod_rewrite for Apache on Ubuntu 18.04

Apache’s mod_rewrite module lets you redirect URLs based on additional conditions, or rewrite URLs in a cleaner fashion, translating human-readable paths into code-friendly query string. In this tutorial, you’ll enable `mod_rewrite` and use `.htaccess` files to create a basic URL redirection, and then explore a couple of advanced use cases.

Read more
How To Install Ruby on Rails on Arch Linux with RVM — step-by-step Linux tutorial on Progressive Robot

How To Install Ruby on Rails on Arch Linux with RVM

This tutorial explains how to install RVM (Ruby Version Manager), and then how to install ruby, how to install ruby gems, and how to install rails on Arch Linux. RVM is a program that lets you use several versions of Ruby on Rails on one server and easily switch between them.

Read more
How To Install R on Debian 9 — step-by-step Linux tutorial on Progressive Robot

How To Install R on Debian 9

R is an open-source programming language that specializes in statistical computing and graphics. Supported by the R Foundation for Statistical Computing, it is widely used for developing statistical software and performing data analysis. An increasingly popular and extensible…

Read more
Arch Linux — pcre2 — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — pcre2 — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-201710-18 Related CVEs: CVE-2017-7186 Upstream summary: Type: denial of service. Status: Fixed. Affected: 10.23-1. Fixed in: 10.30-1. Group: AVG-223. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

Read more
How to Configure Chrony as a Time Server on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Chrony as a Time Server on RHEL 7

How to Configure Chrony as a Time Server on RHEL 7 Accurate system time is foundational to almost every enterprise workload. Kerberos authentication, TLS certificate validation, log correlation, and database replication all depend on clocks that stay in sync. While ntpd has served Linux administrators for decades, Red Hat Enterprise Linux 7 ships Chrony as […]

Read more
Common Problems 118601

Ubuntu 16.04 Locale Warnings During Package Installation

🟡 Medium   ⏱ 5–30 min  Last verified: 4 November 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 […]

Read more
Common Problems 118112

Ubuntu 18.04 LTS LVM volume extension not reflected in filesystem

🟡 Medium   ⏱ 5–30 min  Last verified: 4 November 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 […]

Read more
Common Problems 114941

RHEL 8 Kernel Updated but GRUB Boots Older Kernel by Default

🟡 Medium   ⏱ 5–30 min  Last verified: 4 November 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 […]

Read more
SLES 15 — sysconfig — vulnerability — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — sysconfig — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 4 November 2019 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2012:0096-1 (see also SUSE bugzilla) Related CVEs: CVE-2011-4182 Upstream summary: Missing escaping of ESSID values in sysconfig of SUSE Linux Enterprise allows attackers controlling an access point to cause execute arbitrary code. […]

Read more
CHAT