DNS

How to Set Up GlusterFS Distributed Storage on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up GlusterFS Distributed Storage on Debian 10

Introduction How to Set Up GlusterFS Distributed Storage on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster 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 […]

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Common Problems 121205

Debian 10 Logrotate Not Rotating Application Logs

🟡 Medium   ⏱ 5–30 min  Last verified: 14 April 2020 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 & […]

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How to Set Up ArgoCD on Kubernetes on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Set Up ArgoCD on Kubernetes on FreeBSD 12

Introduction This guide explains how to Set Up ArgoCD on Kubernetes 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 […]

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How to Set Up pgBouncer Connection Pooler on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up pgBouncer Connection Pooler on Debian 10

Introduction How to Set Up pgBouncer Connection Pooler on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster 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 […]

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Common Problems 121174

Debian 10: certbot renewal fails because web server port is occupied

🟠 High   ⏱ 5–30 min  Last verified: 13 April 2020 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 & […]

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Common Problems 119032

Ubuntu 14.04 LTS Apache returns 503 due to PHP-FPM issues

🟠 High   ⏱ 5–30 min  Last verified: 13 April 2020 Affected versions: 14.04 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 Install and Configure Cassandra on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install and Configure Cassandra on Debian 10

Introduction This guide explains how to Install and Configure Cassandra on Debian 10 on Debian 10 Buster. Debian Buster uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 10 install with the […]

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Common Problems 118986

Ubuntu 14.04 LTS – significant time drift breaks auth and jobs – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 13 April 2020 Affected versions: Ubuntu 14.04 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 Install MongoDB on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install MongoDB on RHEL 7

How to Install MongoDB on RHEL 7 MongoDB is a document-oriented NoSQL database that stores data in flexible, JSON-like BSON documents rather than traditional rows and columns. Its schema-less design makes it an excellent choice for applications that need to handle varied or rapidly evolving data structures, such as content management systems, real-time analytics platforms, […]

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How to Configure Docker Networking on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure Docker Networking on RHEL 8

Docker networking determines how containers communicate with each other, with the host, and with external networks. RHEL 8 adds a layer of complexity because Docker writes its own iptables rules at startup, which can interact unexpectedly with firewalld — the default firewall manager on RHEL 8. Understanding Docker’s network drivers and how they map to […]

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