Skip to content

Check mysql-traffic

Overview

Reports MySQL/MariaDB traffic statistics including uptime, queries per second, total connections, bytes transferred, and the read/write ratio based on SELECT, INSERT, UPDATE, DELETE, and REPLACE. Logic taken from MySQLTuner:mysql_stats() and verified in sync with MySQLTuner.

Important Notes:

  • See additional notes for all mysql monitoring plugins
  • This plugin is purely informational and always returns OK
  • The single-line summary shows lifetime totals (since Uptime) for human reading. Trends are best inspected on the Grafana dashboard, which plots the per-second rates persisted in the local SQLite cache

Data Collection:

  • Queries SHOW GLOBAL STATUS for Bytes_received, Bytes_sent, Com_delete, Com_insert, Com_replace, Com_select, Com_update, Connections, Questions, and Uptime
  • Calculates queries per second as Questions / Uptime
  • Calculates the read/write ratio from SELECT (reads) and INSERT + UPDATE + DELETE + REPLACE (writes)
  • Cumulative counters are persisted in a local SQLite cache between runs so the dashboard plots per-second rates without non_negative_difference() workarounds

Fact Sheet

Fact Value
Check Plugin Download https://github.com/Linuxfabrik/monitoring-plugins/tree/main/check-plugins/mysql-traffic
Nagios/Icinga Check Name check_mysql_traffic
Check Interval Recommendation Every minute
Can be called without parameters Yes
Runs on Cross-platform
Compiled for Windows No
Requirements User with no privileges, locked down to 127.0.0.1 - for example monitoring\@127.0.0.1. Usernames in MySQL/MariaDB are limited to 16 chars in specific versions.
3rd Party Python modules pymysql

Help

usage: mysql-traffic [-h] [-V] [--defaults-file DEFAULTS_FILE]
                     [--defaults-group DEFAULTS_GROUP] [--timeout TIMEOUT]

Reports MySQL/MariaDB traffic statistics: uptime, queries per second, total
connections, bytes transferred, and the SELECT-vs-write ratio. Purely
informational; the plugin always returns OK. Cumulative counters
(`Bytes_received`, `Bytes_sent`, `Connections`, `Questions`, `Com_*`) are
emitted as in-plugin-computed per-second rates so the Grafana dashboard plots
them without `non_negative_difference()` workarounds.

options:
  -h, --help            show this help message and exit
  -V, --version         show program's version number and exit
  --defaults-file DEFAULTS_FILE
                        MySQL/MariaDB cnf file to read user, host and password
                        from. Example: `--defaults-
                        file=/var/spool/icinga2/.my.cnf`. Default:
                        /var/spool/icinga2/.my.cnf
  --defaults-group DEFAULTS_GROUP
                        Group/section to read from in the cnf file. Default:
                        client
  --timeout TIMEOUT     Network timeout in seconds. Default: 3 (seconds)

Usage Examples

./mysql-traffic

Output:

Up 1W 3D (907.7K q [1.0 qps], 470.0 conn, TX: 560.2M, RX: 96.4M); Read/Write: 65.3%/34.7%

States

  • Always returns OK.

Perfdata / Metrics

Name Type Description
mysql_bytes_received_per_second Rate Per-second rate of Bytes_received (cumulative counter delta against the local SQLite cache). Appears from the second run onwards.
mysql_bytes_sent_per_second Rate Per-second rate of Bytes_sent. Appears from the second run onwards.
mysql_com_delete_per_second Rate Per-second rate of Com_delete. Appears from the second run onwards.
mysql_com_insert_per_second Rate Per-second rate of Com_insert. Appears from the second run onwards.
mysql_com_replace_per_second Rate Per-second rate of Com_replace. Appears from the second run onwards.
mysql_com_select_per_second Rate Per-second rate of Com_select (includes queries served from the query cache). Appears from the second run onwards.
mysql_com_update_per_second Rate Per-second rate of Com_update. Appears from the second run onwards.
mysql_connections_per_second Rate Per-second rate of Connections (successful and failed connection attempts). Appears from the second run onwards.
mysql_pct_reads Percentage total_reads / (total_reads + total_writes) * 100. Lifetime ratio, not a per-interval value.
mysql_pct_writes Percentage 100 - pct_reads. Lifetime ratio.
mysql_qps Number Lifetime queries per second (Questions / Uptime).
mysql_questions_per_second Rate Per-second rate of Questions. Appears from the second run onwards.
mysql_uptime Seconds Uptime of the server.

Credits, License