MySQL Server Exporter

Prometheus exporter for MySQL server metrics.

Supported versions:

• MySQL >= 5.6.
• MariaDB >= 10.3

NOTE: Not all collection methods are supported on MySQL/MariaDB < 5.6

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 build

Running

Single exporter mode

Running using .my.cnf from the current directory:

./mysqld_exporter <flags>

Multi-target support

This exporter supports the multi-target pattern. This allows running a single instance of this exporter for multiple MySQL targets.

To use the multi-target functionality, send an http request to the endpoint /probe?target=foo:3306 where target is set to the DSN of the MySQL instance to scrape metrics from.

To avoid putting sensitive information like username and password in the URL, you can have multiple configurations in config.my-cnf file and match it by adding &auth_module=<section> to the request.

Sample config file for multiple configurations

    [client]
    user = foo
    password = foo123
    [client.servers]
    user = bar
    password = bar123

On the prometheus side you can set a scrape config as follows

    - job_name: mysql # To get metrics about the mysql exporter’s targets
      params:
        # Not required. Will match value to child in config file. Default value is `client`.
        auth_module: [client.servers]
      static_configs:
        - targets:
          # All mysql hostnames or unix sockets to monitor.
          - server1:3306
          - server2:3306
          - unix:///run/mysqld/mysqld.sock
      relabel_configs:
        - source_labels: [__address__]
          target_label: __param_target
        - source_labels: [__param_target]
          target_label: instance
        - target_label: __address__
          # The mysqld_exporter host:port
          replacement: localhost:9104

Flag format

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

General Flags

Environment Variables

Configuration precedence

If you have configured cli with both mysqld flags and a valid configuration file, the options in the configuration file will override the flags for client section.

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.

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

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 \
  -v /home/user/user_my.cnf:/.my.cnf \
  --network my-mysql-network  \
  prom/mysqld-exporter

heartbeat

With collect.heartbeat enabled, mysqld_exporter will scrape replication delay measured by heartbeat mechanisms. Pt-heartbeat is the reference heartbeat implementation supported.

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