Boot Startup

How to Set Up a Bash Profile, .bashrc and Environment Variables on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Set Up a Bash Profile, .bashrc and Environment Variables on RHEL 8

Every interactive shell session on RHEL 8 is governed by a chain of startup scripts that define environment variables, aliases, functions, and the prompt. Understanding which file is loaded and when prevents confusion around why a variable set in one terminal disappears in another, or why a cron job cannot find a command that works […]

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Common Problems 115497

journalctl Shows Repeated Unit Restart Loops

🟡 Medium   ⏱ 5–30 min  Last verified: 7 September 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 […]

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How to Set Up Loki and Promtail on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Set Up Loki and Promtail on FreeBSD 13

Introduction How to Set Up Loki and Promtail on FreeBSD 13 is a core administration task for any FreeBSD 13 server operator. FreeBSD 13 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 […]

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Debian 11 — twitter-bootstrap4 — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — twitter-bootstrap4 — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 7 September 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-8331 Upstream summary: In Bootstrap before 3.4.1 and 4.3.x before 4.3.1, XSS is possible in the tooltip or popover data-template attribute. Table of contents Symptom & Impact Environment […]

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How to Configure Nginx WebSocket Proxying on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Configure Nginx WebSocket Proxying on FreeBSD 13

Introduction FreeBSD 13 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up configure nginx websocket proxying on freebsd 13 on FreeBSD 13 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 Linux […]

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How to Configure Nginx as a TCP/UDP Load Balancer on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Configure Nginx as a TCP/UDP Load Balancer on FreeBSD 13

Introduction FreeBSD 13 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up configure nginx as a tcp/udp load balancer on freebsd 13 on FreeBSD 13 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently […]

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How to Configure HashiCorp Vault on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure HashiCorp Vault on Debian 9

Introduction Debian 9 Stretch is built around the ethos of stability and free software. Setting up configure hashicorp vault on debian 9 on Stretch leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Stretch freeze. Follow each step carefully and the […]

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How to Configure Disk Encryption with GELI on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Configure Disk Encryption with GELI on FreeBSD 13

Introduction This guide explains how to Configure Disk Encryption with GELI on FreeBSD 13 on FreeBSD 13. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for […]

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Common Problems 125023

Oracle Linux 8 – Common Problem 006 – Diagnosis and Fix

🟡 Medium   ⏱ 5–30 min  Last verified: 3 September 2021 Affected versions: Oracle Linux 8 📖 ~3 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 Install Docker Compose on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Install Docker Compose on FreeBSD 12

Introduction This guide explains how to Install Docker Compose on FreeBSD 12 on FreeBSD 12. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for fine-grained privilege […]

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