The article analyzes why a Java service repeatedly crashes around midnight in test environments, tracing the issue through system limits, Java version checks, cron job execution, strace logs, and Linux OOM killer behavior, and finally proposes configuration and version upgrades to prevent the failures.
This article explains why Percona Xtrabackup backups of MySQL 5.7 can fail with "Too many open files" errors, demonstrates how to reproduce the issue under both non‑root and root users, analyzes the open‑files‑limit settings, and provides practical solutions to adjust system and user limits for successful backups.
This article presents a systematic investigation of MySQL's open_files_limit setting across three scenarios—conflict between my.cnf and systemd service, effectiveness when using mysqld_safe, and the impact of Docker's own limits—revealing which source actually controls the maximum number of open files.
This article explains how MySQL, when run by a non‑root user with limited system resources, automatically adjusts the open_files_limit, max_connections, and table_open_cache parameters by calculating required file descriptors, comparing them to system limits, and correcting the configuration values accordingly.
Learn how to configure Linux to support up to one million concurrent connections by adjusting kernel parameters, file descriptor limits, memory usage, and network settings, with detailed command examples, code samples, and practical calculations of required RAM and bandwidth.
