Troubleshooting

How to Install Containerd as a Container Runtime on Debian 10

• August 9, 2020
• Linux
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Introduction Deploying install containerd as a container runtime on debian 10 on a Debian 10 Buster machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites […]

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Oracle Linux 8 — sane-backends — vulnerability — patch and remediation guide (ELSA-2020-2902)

• August 9, 2020
• Linux
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🟠 High   ⏱ 15–60 min  Last verified: 9 August 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-2902 Related CVEs: CVE-2020-12861 CVE-2020-12865 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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SLES 12 — php5 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

• August 9, 2020
• Linux
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🔴 Critical   ⏱ 15–90 min  Last verified: 9 August 2020 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2016:1504-1 (see also SUSE bugzilla) Related CVEs: CVE-2016-4542 CVE-2016-4543 CVE-2016-4544 CVE-2020-7060 CVE-2015-2787 CVE-2015-3329 CVE-2015-6831 CVE-2015-8879  +12 more Upstream summary: The exif_process_IFD_TAG function in ext/exif/exif.c in PHP before 5.5.35, 5.6.x before 5.6.21, and […]

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Debian 10 – Certbot Renewal Fails in Automation – Reliable ACME Recovery

• August 8, 2020
• Linux
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🟠 High   ⏱ 5–30 min  Last verified: 8 August 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 & […]

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Ubuntu 18.04 Nginx 502 Bad Gateway with PHP-FPM

• August 8, 2020
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 8 August 2020 📖 ~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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rsyslog Not Forwarding Logs to Central Collector

• August 8, 2020
• Tutorials
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🟡 Medium   ⏱ 5–30 min  Last verified: 8 August 2020 📖 ~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 Configure RAID with mdadm on Debian 10

• August 8, 2020
• Linux
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Introduction This guide explains how to Configure RAID with mdadm 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 the […]

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Windows Server 2016 – Storage Replica initial sync never completes – Fix & Prevention

• August 8, 2020
• Tutorials
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🟠 High   ⏱ 5–30 min  Last verified: 8 August 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 […]

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IBM AIX 7.1 — CVE-2020-4675 — vulnerability — patch and remediation guide

• August 8, 2020
• Tutorials
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🟡 Medium   ⏱ 15–45 min  Last verified: 8 August 2020 Affected versions: IBM AIX 7.1 📖 ~4 min read  •  Source: NVD CVE-2020-4675, IBM Support Bulletin CVE: CVE-2020-4675 NVD summary: IBM InfoSphere Master Data Management Server 11.6 is vulnerable to cross-site request forgery which could allow an attacker to execute malicious and unauthorized actions […]

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How to Set Up Uptime Monitoring with PRTG on Windows Server 2012 R2

• August 8, 2020
• Tutorials
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How to Set Up Uptime Monitoring with PRTG on Windows Server 2012 R2 PRTG Network Monitor by Paessler is a widely deployed network and infrastructure monitoring platform that provides comprehensive uptime monitoring, performance metrics, and alerting for Windows Server 2012 R2 environments. PRTG uses a combination of ping checks, WMI queries, SNMP polling, and the […]

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