Checks the open file usage in MySQL/MariaDB. Logic is taken from MySQLTuner script:mysql_stats(), v1.9.8.
Hints:
Check Plugin Download | https://github.com/Linuxfabrik/monitoring-plugins/tree/main/check-plugins/mysql-open-files |
Check Interval Recommendation | Every 5 minutes |
Can be called without parameters | Yes |
Compiled for | Linux, Windows |
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 |
usage: mysql-open-files [-h] [-V] [--always-ok]
[--defaults-file DEFAULTS_FILE]
[--defaults-group DEFAULTS_GROUP] [--timeout TIMEOUT]
Checks the open file usage in MySQL/MariaDB.
options:
-h, --help show this help message and exit
-V, --version show program's version number and exit
--always-ok Always returns OK.
--defaults-file DEFAULTS_FILE
Specifies a cnf file to read parameters like user,
host and password from (instead of specifying them on
the command line), for example
`/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)
./mysql-open-files --defaults-file=/var/spool/icinga2/.my.cnf
Output:
0.2% of open_files_limit used (80.0/32.8K).
- WARN if amount of open files is > 85%.
Name | Type | Description |
---|---|---|
mysql_open_files | Number | Number of regular files currently opened by the server. Does not include sockets or pipes, or storage engines using internal functions. |
mysql_open_files_limit | Number | The number of file descriptors available to MariaDB. If you are getting the Too many open files error, then you should increase this limit. |
mysql_pct_files_open | Percentage | Open_files / open_files_limit * 100 |
Authors: Linuxfabrik GmbH, Zurich
License: The Unlicense, see LICENSE file.
Credits:
- heavily inspired by MySQLTuner (https://github.com/major/MySQLTuner-perl)