August 2019 - Page 61 of 69

Common Problems 115006

RHEL 8 XFS Filesystem Remounts Read-Only After I/O Error Burst

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~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 Work with Strings in JavaScript — step-by-step Javascript tutorial on Progressive Robot

How To Work with Strings in JavaScript

A string is a sequence of one or more characters that may consist of letters, numbers, or symbols. Strings in JavaScript are primitive data types and immutable, which means they are unchanging. As strings are the way we display and work with text, and text is our main…

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Ubuntu 18.04 — sdl-image1.2 — multiple vulnerabilities (12 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — sdl-image1.2 — multiple vulnerabilities (12 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4238-1 Related CVEs: CVE-2018-3977 CVE-2019-12216 CVE-2019-12217 CVE-2019-12218 CVE-2019-12219 CVE-2019-12220 CVE-2019-12221 CVE-2019-12222  +4 more Upstream summary: It was discovered that SDL_image incorrectly handled certain image files. An attacker could possibly use […]

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How to Configure Network QoS with tc on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure Network QoS with tc on RHEL 9

Network Quality of Service (QoS) lets you control how bandwidth is distributed across different types of traffic, ensuring that latency-sensitive applications like VoIP or interactive SSH sessions remain responsive even when bulk transfers saturate the link. The Linux tc (traffic control) subsystem implements this through a combination of queuing disciplines, classes, and packet filters. This […]

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Ubuntu 14.04 — walinuxagent — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — walinuxagent — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-3907-1 Related CVEs: CVE-2019-0804 Upstream summary: It was discovered that WALinuxAgent created swap files with incorrect permissions. A local attacker could possibly use this issue to obtain sensitive information from […]

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Oracle Linux 8 — icedtea-web — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — icedtea-web — vulnerability — patch and remediation guide (ELSA-2019-2004)

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-2004 Related CVEs: CVE-2019-10185 CVE-2019-10181 CVE-2019-10182 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification […]

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/dev/null in Linux — step-by-step Linux tutorial on Progressive Robot

/dev/null in Linux

/dev/null in Linux is a null device file. This will discard anything written to it, and will return EOF on reading. This is a command-line hack that acts as a vacuum, that sucks anything thrown to it. Let's take a look at understanding what it means, and what we can do with this file. /dev/null […]

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