Linux

Common Problems 117581

Ubuntu 20.04 LTS – kubelet fails to start due to cgroup driver mismatch – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 5 August 2020 Affected versions: Ubuntu 20.04 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 115062

RHEL 8 tuned Profile Not Applied After Reboot

🟡 Medium   ⏱ 5–30 min  Last verified: 5 August 2020 Affected versions: 8.5 8.6 8.7 8.8 8.9 8.10 📖 ~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 & […]

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How to Configure Apache2 MPM Worker on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure Apache2 MPM Worker on Debian 10

Introduction Deploying configure apache2 mpm worker 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 Ensure Debian […]

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

Oracle Linux 8 — Unbreakable Enterprise kernel-container — vulnerability — patch and remediation guide (ELSA-2021-9007)

🟠 High   ⏱ 15–60 min  Last verified: 5 August 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-9007 Related CVEs: CVE-2020-29569 CVE-2020-14381 CVE-2020-29568 CVE-2020-28374 CVE-2020-14351 CVE-2020-25705 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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Amazon Linux 2 — kernel-livepatch-4.14.171-136.231 — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — kernel-livepatch-4.14.171-136.231 — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2LIVEPATCH-2020-011 Related CVEs: CVE-2020-12657 CVE-2020-10711 CVE-2020-10942 CVE-2020-8648 Upstream summary: An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body.(CVE-2020-12657) Table of […]

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How To Scale Ruby on Rails Applications Across Multiple Droplets (Part 1) — step-by-step Linux tutorial on Progressive Robot

How To Scale Ruby on Rails Applications Across Multiple Droplets (Part 1)

In this the cloud provider article we are going to see how to simply scale Ruby on Rails applications horizontally, distributing its load across multiple machines running on Unicorn all carefully set up behind a master load balancer running Nginx HTTP server, tasked with welcoming and handling the incoming requests and balancing the load.

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