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How to Set Up Dovecot IMAP Server on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Set Up Dovecot IMAP Server 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 set up dovecot imap server 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 […]

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How to Install Terraform on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install Terraform on Debian 9

Introduction How to Install Terraform on Debian 9 is a fundamental operation for any administrator maintaining a Debian 9 Stretch server. Debian 9 Stretch ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 9. This tutorial […]

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How to Set Up csh and tcsh Aliases on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Set Up csh and tcsh Aliases on FreeBSD 13

Introduction How to Set Up csh and tcsh Aliases 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 […]

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Debian 11 — pam — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — pam — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 11 October 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2002-1227 CVE-2005-2977 CVE-2009-0579 CVE-2009-0887 CVE-2009-3232 CVE-2010-3316 CVE-2010-3430 CVE-2010-3431  +12 more Upstream summary: PAM 0.76 treats a disabled password as if it were an empty (null) password, which allows […]

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How to Monitor System Resources with htop, top and vmstat on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Monitor System Resources with htop, top and vmstat on RHEL 8

Understanding what your RHEL 8 server is doing in real time — and historically — is essential for diagnosing performance bottlenecks, identifying runaway processes, and planning capacity. RHEL 8 includes top by default and provides htop, vmstat, iostat, and sar as complementary tools that each excel in different scenarios. This guide walks through installing and […]

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How to Install Jaeger for Distributed Tracing on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Install Jaeger for Distributed Tracing on FreeBSD 13

Introduction Deploying install jaeger for distributed tracing on freebsd 13 on a FreeBSD 13 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the […]

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How to Set Up NFS File Sharing on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Set Up NFS File Sharing on RHEL 7

How to Set Up NFS File Sharing on RHEL 7 Network File System (NFS) is a distributed file system protocol that allows a server to share directories over a network, enabling client machines to mount and access those directories as if they were local storage. NFS has been a cornerstone of Unix and Linux networking […]

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Common Problems 117625

Ubuntu 20.04 LTS systemctl Failed to Connect to Bus

🟡 Medium   ⏱ 5–30 min  Last verified: 9 October 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 Harden Nginx with Security Headers on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Harden Nginx with Security Headers on FreeBSD 13

Introduction This guide explains how to Harden Nginx with Security Headers 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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