Networking

Common Problems 118423

Ubuntu 16.04 LTS – DNS resolution intermittently fails on servers – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 August 2021 Affected versions: Ubuntu 16.04 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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How to Set Up Nexus Repository Manager on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Set Up Nexus Repository Manager 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 nexus repository manager 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 InfluxDB and Telegraf on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Install InfluxDB and Telegraf 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 install influxdb and telegraf 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 Linux […]

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How to Install Ansible on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Install Ansible on FreeBSD 13

Introduction How to Install Ansible 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 packet filtering, and […]

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How to Install PostgreSQL 16 on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Install PostgreSQL 16 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 install postgresql 16 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 distribution. […]

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How to Set Up Nginx with PHP-FPM on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Set Up Nginx with PHP-FPM on Debian 9

Introduction Debian 9 Stretch is built around the ethos of stability and free software. Setting up set up nginx with php-fpm 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 […]

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How to Install Prometheus on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Install Prometheus on FreeBSD 13

Introduction Deploying install prometheus 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 standard base + […]

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How to Configure MySQL Primary-Replica Replication on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure MySQL Primary-Replica Replication on RHEL 7

How to Configure MySQL Primary-Replica Replication on RHEL 7 MySQL replication allows data written to one server (the primary, formerly called master) to be automatically copied to one or more other servers (replicas, formerly called slaves). This is one of the most widely deployed MySQL high-availability techniques: it provides read-scale-out by offloading SELECT queries to […]

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Common Problems 118449

Ubuntu 16.04 LTS ext4 Filesystem Remounted Read-Only

🟠 High   ⏱ 5–30 min  Last verified: 24 August 2021 Affected versions: 16.04 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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