Operations

Oracle Linux 8 — mysql:8.0 security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — mysql:8.0 security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2023-3087)

  • October 14, 2020
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 14 October 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-3087 Related CVEs: CVE-2023-21875 CVE-2023-21917 CVE-2022-21604 CVE-2022-39400 CVE-2023-21863 CVE-2023-21871 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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Common Problems 118469

Ubuntu 16.04 LTS Swap Exhaustion Triggers OOM Kills

  • October 14, 2020
  • Linux
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🟠 High   ⏱ 5–30 min  Last verified: 14 October 2020 Affected versions: 16.04 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 113603

Windows Server 2012 R2 — VLAN mismatch causes intermittent network reachability — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 14 October 2020 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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Common Problems 113574

Windows Server 2016 – Storage Replica asynchronous RPO spikes during backup windows – Fix & Prevention (FIX-PREVENTION-2)

🟡 Medium   ⏱ 5–30 min  Last verified: 14 October 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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Common Problems 113488

Windows Server 2012 R2 — Update Scan Fails with 0x8024402c Due to Proxy Misconfiguration — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 14 October 2020 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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How to Configure Concourse CI on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure Concourse CI on Oracle Linux 8

Introduction How to Configure Concourse CI 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 […]

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Common Problems 113109

Windows Server 2016 – Hyper-V host reboot leaves critical VMs in saved state – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 14 October 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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How to Mount NFS Shares on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Mount NFS Shares on FreeBSD 12

  • October 14, 2020
  • FreeBSD
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Introduction How to Mount NFS Shares on FreeBSD 12 is a core administration task for any FreeBSD 12 server operator. FreeBSD 12 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet filtering, […]

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Oracle Linux 8 — openssh — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — openssh — vulnerability — patch and remediation guide (ELSA-2024-3166)

  • October 14, 2020
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 14 October 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2024-3166 Related CVEs: CVE-2020-15778 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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How to Configure Mandatory Access Control on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure Mandatory Access Control on Debian 9

  • October 14, 2020
  • Linux
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Introduction This guide explains how to Configure Mandatory Access Control on Debian 9 on Debian 9 Stretch. Debian Stretch 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 9 install with the […]

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