web server

How to Harden PHP on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Harden PHP on RHEL 8

PHP runs on millions of web servers, but a default installation leaves many dangerous settings enabled that attackers can exploit. On RHEL 8, hardening PHP through /etc/php.ini is one of the most impactful steps you can take to protect your application without touching a single line of code. This tutorial covers the most important security-oriented […]

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Common Problems 118568

Nginx fails to reload due to duplicate server_name

🟡 Medium   ⏱ 5–30 min  Last verified: 26 October 2019 📖 ~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 Install Laravel on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Install Laravel on RHEL 8

Laravel is the most popular PHP framework in the world, offering an elegant syntax, a powerful ORM (Eloquent), built-in authentication scaffolding, and a rich ecosystem of first-party packages. Installing Laravel on RHEL 8 involves a few more steps than on a generic Linux distribution because of SELinux and the systemd-managed PHP-FPM service. This tutorial guides […]

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Common Problems 118544

Ubuntu 16.04 LTS nginx fails to start due to certificate chain error

🟠 High   ⏱ 5–30 min  Last verified: 23 October 2019 Affected versions: 16.04 📖 ~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 […]

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How to Configure AppArmor Profiles on SLES 15 — step-by-step SUSE Linux Enterprise 15 tutorial on Progressive Robot

How to Configure AppArmor Profiles on SLES 15

Introduction This tutorial covers How to Configure AppArmor Profiles 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. Step 1 — Check AppArmor Status systemctl status apparmor aa-status Step 2 […]

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How to Set Up a Highly Available Web Stack with Keepalived on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Set Up a Highly Available Web Stack with Keepalived on RHEL 7

How to Set Up a Highly Available Web Stack with Keepalived on RHEL 7 High availability eliminates single points of failure by ensuring that if one server goes down, another takes over seamlessly. For web servers, one of the most common HA patterns is a Virtual IP (VIP) address that floats between two or more […]

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How to Configure IIS Logging and Analysis on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure IIS Logging and Analysis on Windows Server 2019

Introduction to IIS Logging and Analysis on Windows Server 2019 Internet Information Services (IIS) on Windows Server 2019 generates detailed access logs for every HTTP and HTTPS request received by a web server. These logs are invaluable for performance analysis, troubleshooting 4xx and 5xx errors, detecting security threats (such as directory traversal or SQL injection […]

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How to Set Up Windows Server 2019 with Salt — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up Windows Server 2019 with Salt

How to Set Up Windows Server 2019 with Salt SaltStack (Salt) is a powerful configuration management and remote execution tool that supports Windows Server 2019 as a first-class managed platform. Salt uses a master/minion architecture where a Salt Master server manages Salt Minions installed on client machines. Salt states (written in YAML with Jinja2 templating) […]

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How to Deploy a Spring Boot Application on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Deploy a Spring Boot Application on RHEL 7

How to Deploy a Spring Boot Application on RHEL 7 Spring Boot has become the de facto standard for building production-ready Java microservices and web applications. Its embedded server model — packaging the entire application, including Tomcat or Jetty, into a single executable JAR — greatly simplifies deployment on Linux servers. Instead of managing a […]

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Common Problems 119066

Ubuntu 14.04 LTS – Apache returns 502 due to PHP-FPM backend issues – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 8 October 2019 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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