This guide lists the most important Linux log files under /var/log, explains what each records, and shows practical commands for viewing and alerting on critical events such as system errors, authentication failures, kernel messages, and web server activity to improve troubleshooting and security.
This article enumerates the most common Linux system log files under /var/log, explains the purpose of each log—including messages, dmesg, auth, boot, daemon, and service-specific logs—and lists key subdirectories for web, mail, audit, and other services.
This article explains why Tomcat log files inherit restrictive permissions after deployment, describes Linux UMASK behavior, and provides step‑by‑step instructions to modify the catalina.sh script so that log files use the system's default 644/640 permissions.
This article explains MySQL’s various log files—including error log, slow query log, binary log and general query log—detailing how to locate, configure, view, and analyze them using MySQL commands, and how to adjust settings such as long_query_time and log_output for optimal performance.
This article outlines the four main types of MySQL physical files—system, log, replication, and data files—detailing their purposes and showing visual examples to help database administrators manage storage effectively and ensure optimal performance.
