web server

How to Install containerd as a Container Runtime on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install containerd as a Container Runtime on RHEL 7

How to Install containerd as a Container Runtime on RHEL 7 containerd is a high-performance, industry-standard container runtime that serves as the foundation beneath both Docker and Kubernetes. When Kubernetes deprecated the Dockershim in version 1.20 and removed it in version 1.24, containerd became the most widely adopted direct container runtime for Kubernetes clusters. Installing […]

Read more
How to Configure Nginx with PageSpeed Module on SLES 15 — step-by-step SUSE Linux Enterprise 15 tutorial on Progressive Robot

How to Configure Nginx with PageSpeed Module on SLES 15

Introduction This tutorial covers How to Configure Nginx with PageSpeed Module on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 15 system is up to date: […]

Read more
Common Problems 121074

Debian 10: Apache returns 503 because PHP-FPM socket is missing

🟠 High   ⏱ 5–30 min  Last verified: 1 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 & […]

Read more
How to Configure AppArmor on SLES 12 — step-by-step SUSE Linux Enterprise 12 tutorial on Progressive Robot

How to Configure AppArmor on SLES 12

Introduction This tutorial covers How to Configure AppArmor on SLES 12 on SLES 12. SLES 12 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Step 1 — Check AppArmor Status systemctl status apparmor aa-status Step 2 — […]

Read more
How to Install Cockpit Web Console on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install Cockpit Web Console on Debian 10

Introduction This guide explains how to Install Cockpit Web Console 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 […]

Read more
How to Configure Docker Networking on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Docker Networking on RHEL 7

How to Configure Docker Networking on RHEL 7 Docker provides a powerful networking model that allows containers to communicate with each other, with the host, and with the outside world in a secure and configurable way. Out of the box, Docker creates a default bridge network and manages its own iptables rules to control traffic […]

Read more
How to Monitor Nginx with Prometheus nginx-exporter on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Monitor Nginx with Prometheus nginx-exporter on RHEL 8

Prometheus is a widely adopted open-source monitoring system that collects time-series metrics by scraping HTTP endpoints. Nginx does not expose Prometheus-format metrics natively, but the official nginx-prometheus-exporter bridges the gap by reading Nginx’s built-in stub status page and converting it into a format Prometheus understands. This tutorial shows how to enable the stub status module […]

Read more
How to Install Symfony on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install Symfony on RHEL 7

How to Install Symfony on RHEL 7 Symfony is a mature, enterprise-grade PHP framework built around reusable components that power projects ranging from small APIs to large-scale e-commerce platforms. Many PHP projects, including Drupal, Laravel, and Magento, depend directly on Symfony components. Installing Symfony on RHEL 7 follows a similar pattern to other PHP frameworks: […]

Read more
Common Problems 115556

RHEL 7 service httpd Starts but Health Check Still Fails

🟠 High   ⏱ 5–30 min  Last verified: 24 March 2020 Affected versions: RHEL 7 📖 ~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 118081

Ubuntu 18.04 Apache Service Fails with Config Test Error

🟡 Medium   ⏱ 5–30 min  Last verified: 21 March 2020 📖 ~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
CHAT