September 2020 - Page 47 of 66

How to Install ArgoCD on Kubernetes on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Install ArgoCD on Kubernetes on RHEL 9

ArgoCD is a declarative, GitOps-based continuous delivery tool for Kubernetes. In the GitOps model, Git is the single source of truth for both application code and infrastructure configuration — when a developer pushes a change to a Git repository, ArgoCD automatically detects the change and applies it to the Kubernetes cluster, keeping the live cluster […]

Read more
Common Problems 121075

Debian 10 SSH Public Key Authentication Fails

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 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 & […]

Read more
Common Problems 118448

Grub Rescue Prompt After Update

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~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
Common Problems 117974

Ubuntu 18.04 time drift or NTP not syncing

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~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
FreeBSD 12 — apache-ant — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — apache-ant — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: Apache Ant leaks sensitive information via the java.io.tmpdir Related CVEs: CVE-2020-1945 Upstream summary: Apache reports: Apache Ant 1.1 to 1.9.14 and 1.10.0 to 1.10.7 uses the default temporary directory identified […]

Read more
Common Problems 116081

Ubuntu 26.04 LTS – UFW blocks expected application traffic – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Ubuntu 26.04 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 […]

Read more
How to Use GPFS Snapshots on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Use GPFS Snapshots on IBM AIX 7.1

Introduction IBM AIX 7.1 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to use gpfs snapshots on ibm aix 7.1 on IBM […]

Read more
How to Tune Kernel Parameters with sysctl on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Tune Kernel Parameters with sysctl on FreeBSD 12

Introduction FreeBSD 12 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up tune kernel parameters with sysctl on freebsd 12 on FreeBSD 12 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently from any […]

Read more
How to Configure an SMTP Relay on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure an SMTP Relay on Windows Server 2012 R2

How to Configure an SMTP Relay on Windows Server 2012 R2 An SMTP relay server acts as an intermediary mail gateway, accepting email from authorised internal systems (applications, printers, monitoring tools, scripts) and forwarding it to its destination — either a smart host (such as Exchange or Office 365) or directly via MX lookup. Every […]

Read more
CHAT