Logging Monitoring

How to Install Prometheus and Grafana on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Install Prometheus and Grafana on RHEL 8

Prometheus and Grafana are two of the most widely adopted open-source tools for infrastructure monitoring and metrics visualization. Prometheus scrapes and stores time-series data from your systems, while Grafana turns that data into rich, interactive dashboards. Together they give RHEL 8 administrators a powerful, production-ready observability stack. This tutorial walks through installing both tools from […]

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Oracle Linux 8 — python36:3.6 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — python36:3.6 — vulnerability — patch and remediation guide (ELSA-2021-9129)

🟠 High   ⏱ 15–60 min  Last verified: 26 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-9129 Related CVEs: CVE-2021-3177 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Oracle Linux 8 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide (ELSA-2020-5805)

🟠 High   ⏱ 15–60 min  Last verified: 26 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-5805 Related CVEs: CVE-2019-19054 CVE-2019-19462 CVE-2020-10768 CVE-2020-10767 CVE-2020-10732 CVE-2020-12888 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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Arch Linux — ruby-addressable — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — ruby-addressable — 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-202107-19 Related CVEs: CVE-2021-32740 Upstream summary: Type: denial of service. Status: Fixed. Affected: 2.7.0-3. Fixed in: 2.8.0-1. Group: AVG-2136. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Oracle Linux 8 — nss — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — nss — security and stability fixes — required update (ELSA-2021-0538)

🟡 Medium   ⏱ 10–30 min  Last verified: 25 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-0538 Related CVEs: CVE-2020-6829 CVE-2020-12400 CVE-2020-12403 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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Common Problems 121514

Debian 9 – boot is delayed by systemd-networkd-wait-online timeout

🟡 Medium   ⏱ 5–30 min  Last verified: 25 January 2021 Affected versions: Debian 9 📖 ~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 118518

sudo: unable to resolve host

🟡 Medium   ⏱ 5–30 min  Last verified: 25 January 2021 📖 ~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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Common Problems 112479

Windows Server 2019 — Group Policy firewall settings block SMB administration traffic — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 25 January 2021 Affected versions: Windows Server 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 […]

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