mysqld_exporter

README

MySQL Server Exporter

Prometheus exporter for MySQL server metrics.

Supported versions:

• MySQL >= 8.0.

Building and running

Required Grants

CREATE USER 'exporter'@'localhost' IDENTIFIED BY 'XXXXXXXX' WITH MAX_USER_CONNECTIONS 3;
GRANT PROCESS, REPLICATION CLIENT, SELECT ON *.* TO 'exporter'@'localhost';

NOTE: It is recommended to set a max connection limit for the user to avoid overloading the server with monitoring scrapes under heavy load. This is not supported on all MySQL/MariaDB versions; for example, MariaDB 10.1 (provided with Ubuntu 18.04) does not support this feature.

Build

make

Running

Running using an environment variable:

export DATA_SOURCE_NAME='user:password@(hostname:3306)/'
./mysqld_exporter <flags>

Running using ~/.my.cnf:

./mysqld_exporter <flags>

Example format for flags for version > 0.10.0:

--collect.auto_increment.columns
--no-collect.auto_increment.columns

Example format for flags for version <= 0.10.0:

-collect.auto_increment.columns
-collect.auto_increment.columns=[true|false]

Collector Flags

Name	MySQL Version	Description
collect.auto_increment.columns	5.1	Collect auto_increment columns and max values from information_schema.
collect.binlog_size	5.1	Collect the current size of all registered binlog files
collect.engine_innodb_status	5.1	Collect from SHOW ENGINE INNODB STATUS.
collect.global_status	5.1	Collect from SHOW GLOBAL STATUS (Enabled by default)
collect.info_schema.innodb_metrics	5.6	Collect metrics from information_schema.innodb_metrics.
collect.info_schema.innodb_tablespaces	5.7	Collect metrics from information_schema.innodb_sys_tablespaces.
collect.info_schema.processlist	5.1	Collect thread state counts from information_schema.processlist.
collect.info_schema.processlist.min_time	5.1	Minimum time a thread must be in each state to be counted. (default: 0)
collect.info_schema.replica_host	5.6	Collect metrics from information_schema.replica_host_status.
collect.info_schema.tables	5.1	Collect metrics from information_schema.tables.
collect.info_schema.tables.databases	5.1	The list of databases to collect table stats for, or '*' for all.
collect.perf_schema.eventsstatements	5.6	Collect metrics from performance_schema.events_statements_summary_by_digest.
collect.perf_schema.eventsstatements.digest_text_limit	5.6	Maximum length of the normalized statement text. (default: 120)
collect.perf_schema.eventsstatements.limit	5.6	Limit the number of events statements digests by response time. (default: 250)
collect.perf_schema.eventsstatements.timelimit	5.6	Limit how old the 'last_seen' events statements can be, in seconds. (default: 86400)
collect.perf_schema.eventsstatementssum	5.7	Collect metrics from performance_schema.events_statements_summary_by_digest summed.
collect.perf_schema.eventswaits	5.5	Collect metrics from performance_schema.events_waits_summary_global_by_event_name.
collect.perf_schema.file_events	5.6	Collect metrics from performance_schema.file_summary_by_event_name.
collect.perf_schema.indexiowaits	5.6	Collect metrics from performance_schema.table_io_waits_summary_by_index_usage.
collect.perf_schema.memory_events	5.7	Collect metrics from performance_schema.memory_summary_global_by_event_name.
collect.perf_schema.tableiowaits	5.6	Collect metrics from performance_schema.table_io_waits_summary_by_table.
collect.perf_schema.tablelocks	5.6	Collect metrics from performance_schema.table_lock_waits_summary_by_table.
collect.perf_schema.replication_group_members	5.7	Collect metrics from performance_schema.replication_group_members.
collect.perf_schema.replication_group_member_stats	5.7	Collect metrics from performance_schema.replication_group_member_stats.
collect.perf_schema.replication_applier_status_by_worker	5.7	Collect metrics from performance_schema.replication_applier_status_by_worker.
collect.slave_status	5.1	Collect from SHOW SLAVE STATUS (Enabled by default)
collect.slave_hosts	5.1	Collect from SHOW SLAVE HOSTS

General Flags

Name	Description
config.my-cnf	Path to .my.cnf file to read MySQL credentials from. (default: ~/.my.cnf)
log.level	Logging verbosity (default: info)
exporter.lock_wait_timeout	Set a lock_wait_timeout (in seconds) on the connection to avoid long metadata locking. (default: 2)
exporter.log_slow_filter	Add a log_slow_filter to avoid slow query logging of scrapes. NOTE: Not supported by Oracle MySQL.
web.config.file	Path to a web configuration file
web.listen-address	Address to listen on for web interface and telemetry.
web.telemetry-path	Path under which to expose metrics.
version	Print the version information.

TLS and basic authentication

The MySQLd Exporter supports TLS and basic authentication.

To use TLS and/or basic authentication, you need to pass a configuration file using the --web.config.file parameter. The format of the file is described in the exporter-toolkit repository.

Setting the MySQL server's data source name

The MySQL server's data source name must be set via the DATA_SOURCE_NAME environment variable. The format of this variable is described at https://github.com/go-sql-driver/mysql#dsn-data-source-name.

Customizing Configuration for a SSL Connection

If The MySQL server supports SSL, you may need to specify a CA truststore to verify the server's chain-of-trust. You may also need to specify a SSL keypair for the client side of the SSL connection. To configure the mysqld exporter to use a custom CA certificate, add the following to the mysql cnf file:

ssl-ca=/path/to/ca/file

To specify the client SSL keypair, add the following to the cnf.

ssl-key=/path/to/ssl/client/key
ssl-cert=/path/to/ssl/client/cert

Customizing the SSL configuration is only supported in the mysql cnf file and is not supported if you set the mysql server's data source name in the environment variable DATA_SOURCE_NAME.

Using Docker

You can deploy this exporter using the prom/mysqld-exporter Docker image.

For example:

docker network create my-mysql-network
docker pull prom/mysqld-exporter

docker run -d \
  -p 9104:9104 \
  --network my-mysql-network  \
  -e DATA_SOURCE_NAME="user:password@(hostname:3306)/" \
  prom/mysqld-exporter

Filtering enabled collectors

The mysqld_exporter will expose all metrics from enabled collectors by default. This is the recommended way to collect metrics to avoid errors when comparing metrics of different families.

For advanced use the mysqld_exporter can be passed an optional list of collectors to filter metrics. The collect[] parameter may be used multiple times. In Prometheus configuration you can use this syntax under the scrape config.

params:
  collect[]:
  - foo
  - bar

This can be useful for having different Prometheus servers collect specific metrics from targets.

Example Rules

There is a set of sample rules, alerts and dashboards available in the mysqld-mixin