Troubleshooting

Common Problems 114929

RHEL 8 – Kernel Update Ends in Dracut Emergency Shell

🟡 Medium   ⏱ 5–30 min  Last verified: 27 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 […]

Read more
How to Configure System Logging with rsyslog on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure System Logging with rsyslog on Oracle Linux 8

Introduction Setting up configure system logging with rsyslog on oracle linux 8 on a Oracle Linux 8 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Configure System Logging with rsyslog on Oracle Linux 8, with all the commands you need, the SELinux and firewalld […]

Read more
Ubuntu 14.04 — lz4 — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — lz4 — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 27 January 2021 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4968-2 Related CVEs: CVE-2021-3520 Upstream summary: USN-4968-1 fixed a vulnerability in LZ4. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. Original advisory details: It […]

Read more
Oracle Linux 8 — pacemaker — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — pacemaker — vulnerability — patch and remediation guide (ELSA-2020-5487)

🟡 Medium   ⏱ 10–30 min  Last verified: 27 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-5487 Related CVEs: CVE-2020-25654 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

Read more
Common Problems 112546

Windows Server 2019 — NPS RADIUS service rejects all authentication requests — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 27 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 […]

Read more
How to Configure Hyper-V Shielded VMs on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure Hyper-V Shielded VMs on Windows Server 2019

Introduction to Hyper-V Shielded VMs Shielded VMs are a Windows Server 2019 Hyper-V security feature that protects virtual machine data from administrators with physical or Hyper-V host access. A shielded VM’s virtual hard disk is encrypted with BitLocker, its state is sealed by virtual TPM (vTPM), and it can only run on hosts that have […]

Read more
Oracle Linux 8 — python-pillow — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — python-pillow — vulnerability — patch and remediation guide (ELSA-2020-3185)

🟠 High   ⏱ 15–60 min  Last verified: 27 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-3185 Related CVEs: CVE-2020-5313 CVE-2020-11538 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

Read more
Oracle Linux 8 — thunderbird — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — thunderbird — vulnerability — patch and remediation guide (ELSA-2020-3341)

🟠 High   ⏱ 15–60 min  Last verified: 27 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-3341 Related CVEs: CVE-2020-15652 CVE-2020-15659 CVE-2020-6463 CVE-2020-6514 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches […]

Read more
How to Install and Configure Memcached on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Install and Configure Memcached on RHEL 8

Memcached is a high-performance, distributed memory object caching system used to speed up dynamic web applications by reducing database load. On RHEL 8, Memcached is available directly from the AppStream repository, making installation straightforward. In this tutorial you will install Memcached, tune its configuration, restrict network access to trusted hosts only, and verify the setup […]

Read more
Oracle Linux 8 — Running nohup prevents ssh command from executing — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — Running nohup prevents ssh command from executing

🟠 High   ⏱ 5–30 min  Last verified: 26 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: Oracle Bug 30287091 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 […]

Read more
CHAT