# README
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
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.engine_tokudb_status | 5.6 | Collect from SHOW ENGINE TOKUDB STATUS. |
| collect.global_status | 5.1 | Collect from SHOW GLOBAL STATUS (Enabled by default) |
| collect.global_variables | 5.1 | Collect from SHOW GLOBAL VARIABLES (Enabled by default) |
| collect.plugins | 5.1 | Collect from SHOW PLUGINS |
| collect.info_schema.clientstats | 5.5 | If running with userstat=1, set to true to collect client statistics. |
| 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.innodb_cmp | 5.5 | Collect InnoDB compressed tables metrics from information_schema.innodb_cmp. |
| collect.info_schema.innodb_cmpmem | 5.5 | Collect InnoDB buffer pool compression metrics from information_schema.innodb_cmpmem. |
| collect.info_schema.processlist | 5.1 | Collect thread state counts from information_schema.processlist. |
| collect.stat_column_capacity | 5.1 | Collect data from dba.stat_column_capacity |
| collect.using_partitions | 5.7 | Collect tables where partitions are used |
| collect.partitions_to_remove | 5.7 | Collect tables where partitions older than 3 month |
| collect.open_tables | 5.1 | Collect tables that are currently open in the table cache |
| 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.query_response_time | 5.5 | Collect query response time distribution if query_response_time_stats is ON. |
| 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.info_schema.tablestats | 5.1 | If running with userstat=1, set to true to collect table statistics. |
| collect.info_schema.schemastats | 5.1 | If running with userstat=1, set to true to collect schema statistics |
| collect.info_schema.userstats | 5.1 | If running with userstat=1, set to true to collect user statistics. |
| collect.mysql.user | 5.5 | Collect data from mysql.user table |
| 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.file_instances | 5.5 | Collect metrics from performance_schema.file_summary_by_instance. |
| collect.perf_schema.file_instances.remove_prefix | 5.5 | Remove path prefix in performance_schema.file_summary_by_instance. |
| 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.memory_events.remove_prefix | 5.7 | Remove instrument prefix in 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 |
| collect.heartbeat | 5.1 | Collect from heartbeat. |
| collect.heartbeat.database | 5.1 | Database from where to collect heartbeat data. (default: heartbeat) |
| collect.heartbeat.table | 5.1 | Table from where to collect heartbeat data. (default: heartbeat) |
| collect.heartbeat.utc | 5.1 | Use UTC for timestamps of the current server (pt-heartbeat is called with --utc). (default: false) |
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. |
| tls.insecure-skip-verify | Ignore tls verification errors. |
| 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
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