RHEL 7

Common Problems 115461

firewalld Blocking Application Port After Deployment

🟡 Medium   ⏱ 5–30 min  Last verified: 27 May 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 […]

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Common Problems 115535

RHEL 7 Postfix Queue Stuck By SELinux Policy

🟡 Medium   ⏱ 5–30 min  Last verified: 25 May 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 & […]

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How to Install MySQL 5.7 on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install MySQL 5.7 on RHEL 7

How to Install MySQL 5.7 on RHEL 7 MySQL 5.7 is one of the most widely deployed open-source relational database management systems in the world. While RHEL 7 ships with MariaDB as its default MySQL-compatible database, many production environments specifically require the Oracle MySQL 5.7 branch for compatibility with existing applications, stored procedures, or third-party […]

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Common Problems 115554

crond Service Not Running Scheduled Jobs

🟡 Medium   ⏱ 5–30 min  Last verified: 16 May 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 […]

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How to Install ClamAV Antivirus on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install ClamAV Antivirus on RHEL 7

How to Install ClamAV Antivirus on RHEL 7 ClamAV is the leading open-source antivirus engine used on Linux servers, primarily for scanning files shared with Windows clients, email attachments passing through mail gateways, and uploaded content on web servers. While RHEL 7 itself is rarely the target of self-propagating malware, compliance frameworks such as PCI-DSS, […]

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Common Problems 115520

httpd Returns 403 Because of SELinux Context

🟡 Medium   ⏱ 5–30 min  Last verified: 6 May 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 […]

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How to Monitor MySQL with Prometheus mysqld_exporter on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Monitor MySQL with Prometheus mysqld_exporter on RHEL 7

How to Monitor MySQL with Prometheus mysqld_exporter on RHEL 7 Prometheus is an open-source monitoring system that scrapes metrics from instrumented targets at regular intervals and stores them in a time-series database. For MySQL monitoring, the official mysqld_exporter binary exposes hundreds of MySQL performance schema metrics, InnoDB statistics, replication lag, and query throughput in the […]

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How to Set Up a Bash Profile, .bashrc and Environment Variables on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Set Up a Bash Profile, .bashrc and Environment Variables on RHEL 7

How to Set Up a Bash Profile, .bashrc and Environment Variables on RHEL 7 A well-configured shell environment can dramatically improve your productivity as a Linux administrator. On Red Hat Enterprise Linux 7, Bash is the default login shell and it reads several configuration files at startup, each serving a distinct purpose. Understanding the difference […]

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How to Install Rust and Compile System Tools on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install Rust and Compile System Tools on RHEL 7

How to Install Rust and Compile System Tools on RHEL 7 Rust is a systems programming language that offers memory safety without a garbage collector, making it an ideal choice for building high-performance command-line utilities, daemons, and system-level tools. On RHEL 7, the system compiler and C runtime are older, but Rust’s installer rustup sidesteps […]

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Common Problems 115402

yum blocked by rpmdb lock or corruption

🟡 Medium   ⏱ 5–30 min  Last verified: 20 April 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 […]

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